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longitudinal, thickly muscular. Buccal mass poste-riorto snout. Jaws (figs 80,367) two somewhat laige platcs, yellowish, with medial cut edge. From jaws two broad folds begin (fig. 367). Both folds of inner surface of dorsal wali of buccal mass run longitudinally to esophagus; both folds broader in middle region, just where present a longitudinal, central ftirrow each, in such anterior extremity duet of salivaiy glands opens. Odontophore (figs 371-373) broad and short, with following distinctive features: 1) m2 paii very thin and narrow; 2) a flap of solid tissue on middle region of radula (to); 3) m4 and m5 short and anteriorly inserted in radular ribbon; 4) pair of m5 United one with other in a laiger degree; 5) mil pair somewhat broad, without connections in cartilages, continues in m7; 6) m7, beyond its origin in m 11 pair, also part originated in subradular membranę; 7) some ligament of radular sac anterior extremity in inner surface of horizontal muscle. Radula short, with radular sac dorsal surface connected with ventral surface of membranę that ćovers buccal mass, but without development of muscle m8. Radular teeth (figs 106-107): rachidian tooth broad, with 5 cusps being central cusp larger, and 2 basal, lateral, Iow projections; lateral tooth with 4 or 5 cusps being second cusp larger; inner marginal tooth rook-like with 2 or 3 smali cusps in each side of a laiger terminal cusp; outer marginal tooth similar to inner one but narrower. Esophagus somewhat short and broad. Anterior esophagus with a pair of broad folds in a side, continuation from those of buccal mass (fig. 367). Middle esophagus with a pair of nanow longitudinal folds, close one another (both continuations from those of anterior esophagus), and sevcral transversal, narrow folds, differentiating an esophageal pouch. Posterior esophagus narrow, marked by a sudden change of pouch folds from transversal to longitudinal; becomes a simple tubę with 6 to 7 longitudinal, similar sized folds. Stornach (figs 370, 374-376) somewhat short, about 1/3 whorl, but broad. Central pad short, roundcd, situated in middle-right region of stornach ventral surface; covers ventrally a well-developed gastric shield. Crescentic ridge broad, arched, situated in posterior region of central pad, from which has a similar size. Duet to digestive gland situated in left insertion of crescentic ridge in central pad, just where begins a fold which divides transversally inner space of stornach. Esophagus aperture anteriorized, at left of anterior gastric chamber and near intestine origin; from esophageal aperture two ventral paralle! folds begin, both run posteriorly and finish in transversal fold; from esophageal aperture other fold begins and runs dorsally parallel to transversal fold. Dorsal sorting area only differentiable by two or three transversal narrow folds in anterior region. Intestine and style sac apertures connected one with other. Style sac broad, short (less than half of remainder stornach), with style. Intestine connected to style sac in almost its entire left side, but separated by a constriction (fig. 376). Intestine contours style sac from left to right side, after another loop tumed anteriorly. Rectum and anus described above. Other details of alimentary tract in Houbrick (1987b: 13, fig. 12).

Genital system. Both, małe and female, described by Houbrick (1987b: 13, fig. 5). Małe with open pallial spermoduct. Female (fig. 370) with open, thick pallial oviduct; lateral lamina with seminal rcceptacle in its posterior border; inner lamina with bursa copulatrix in its posterior border and a sperm groove in remainder border. Ovopositor (fig. 363) a smali lobe near central region of right foot margin, edged posteriorly by a furrow, this furrow runs dorsally sińce pallial oviduct aperture (see also Houbrick, 1987b, fig.3).

Measurements. MZSP 28386 length 6.8 mm; width 2.6 mm.

Distribution. From Florida, USA, to Sao Paulo, Brazil.

Habitat. On algae and gravel, infratidal level.

Materiał examined. Brazil; Rio de Janeiro; off Campos bay, 2r40’12”S 40°37’30^,>W, 16 m, sandy bottom, 19, MZSP 28386 (R. V. Astrogaroupa).

Remarks. Interesting and useful comparison of litiopids, among cerithioideans, is found in Houbrick (1987b: 16-17). Although presenting several differences proper of the family, that author pointed out some similarity of litiopids with cerithiids.

Family Batillariidae Genus Batillaria Benson, 1842 (Type species: Cerithium zonalis Bruguiere, 1792)

Batillaria minima (Gmelin, 1791)

(Figs 32-39,69, 108, 377-389)

Synonymy see Beąuaert, 1942: 7-8. Complement: Batillaria minima: Warmke & Abbott, 1961:72 (pl.