AET. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 49 



Genus CYPRAEA Linnaeus - 



CYPRAEA TRINITATENSIS. new species 



Plate 8, fig. 10 



Shell solid, siibelliptical and smooth. Spire broadly conic, con- 

 sisting of three inflated whorls, apical turn broken off. Aperture 

 narrow above and wide at the anterior end. Teeth equally promi- 

 nent on both lips, rising vertically from within. There are about 

 25 teeth on the outer lip. Anterior canal narrow, fortified above 

 by a single tooth on either side. The specimen is preserved as a 

 cast. The spire as now revealed may have been concealed by 

 enamel, but there is no indication of this. 



Dimensions: Type and only specimen (U. S. Nat. Mus. Cat. 

 No. 352686) measures: Length 39 mm.; lateral diameter 21 mm.; 

 ventral diameter 16 mm. 



The new species in general aspect recalls G. exanthema Linnaeus, 

 a recent species, but Linnaeus's species has a pinched or contracted 

 anterior lateral extremity, while the new species has a broader and 

 less attenuated anterior region. 



Occurrence. — Lower Miocene; Station 8299 (loc. 3), Cumuto Road, 

 IT miles from Eastern Main Road, Trinidad. 



Genus MODULUS Gray 



MODULUS TAMANENSIS Maory 



Plate 7, figs. 1, 2 



Modulus tamanensls Maury, Bull. Amer. Paleont., vol. 10, no. 42, p. 237, pi. 

 40, figs. 2, 3, 1925. 



Shell large and strong with about one smooth, broadly coiled 

 nucleus and seven prominent spirally sculptured subsequent whorls; 

 spire whorls broadly conic: body whorl slightly compressed above 

 the periphery ; base subconic and full. Spire sculpture of six, high, 

 thin, marginally reflected and undulated spirals, the posterior one 

 being strongest and overhangs the suture; base with eight similar 

 subequal spirals. Surface of whorl crossed by retractive growth 

 lines which overrun the summits of the spirals, crenulate them on 

 the later whorls and produce a cancellate ornamentation on the early 

 whorls. Aperture subquadrate ; outer lip sharply lirate within, har- 

 monizing with the spiral sculpture; body wall and lower columella 

 with a moderatel)^ heavy wash of callus; columella short, bearing 

 a thin revolving lamella which forms the left side of the anterior, 

 deep but narrow channel. A small chink is behind the columellar 

 callus. 



