NO. 2055. MARINE MOLLVSKS—BE^'DERSON AND BARTSCH. 421 



CERITHIOPSIS (CERITHIOPSIS) VIRGINICA, new species. 

 Plate 14, fig. 2. 



Shell minute, dark chestnut brown, except the apex, which is yel- 

 lowish white. Nuclear whorls 4, well rounded, smooth. Post-nuclear 

 whorls well rounded, marked by strong axial ribs, of which 16 occur 

 upon all the whorls but the last, which has 18. In addition to the 

 axial ribs, the whorls are marked by 3 strong spiral cords of which 

 the first, wliich is a little less strong than the rest, is at the summit. 

 The junctions of the axial ribs and the spiral cords form strong tuber- 

 cles, which are slightly elongate on the fii-st two cords below the 

 summit, while on the last cord they are truncated posteriorly, sloping 

 gently anteriorly. The spaces inclosed between the spiral cords and 

 the axial libs are rectangular pits on all the whorls but the last; on 

 which they are well rounded. Suture strongly constricted. Pe- 

 riphery of the last whorl marked by a strong somewhat flattened keel, 

 to which the axial ribs extend. Base moderately produced, marked 

 by two spiral cords, one at the insertion of the columella, and another 

 halfway between this and the peripheral cord. Aperture irregular, 

 decidedly channeled anteriorly; posterior angle acute; outer lip thin, 

 showing the external sculpture within. 



The type. Cat. No. 252570, U.S.N.M., was dredged on eel grass in 

 the Bay at Chincoteague, Virginia. It has 6 post-nuclear whorls, 

 and measures: Length, 2.9 mm.; diameter, 1 mm. 



LITTORINA rRRORATA Say. 

 CREPIDULA FORNICATA Linnaeus. 

 CREPIDULA CONVEXA Say. 

 CREPIDULA PLANA Say. 

 NATICA PUSILLA Say. 

 POLYNICES HEROS Say. 

 POLYNICES DUPLICATA Say. 

 SIGARETUS PERSPECTIVUS Say. 

 FISSURELLA ALTERNATA Say. 



EXPLANATION OF PLATES. 

 Plate 13. 



Fig. 1. Epitonnim virginicum, new species, type 3 mm. 



2. Odostomia (Chrysallida) toyatani, new species, type 2.2 mm. 



3. Odostojnia (Evalca) virginica, new species, type 2.7 mm. 



4. Turbonilla (Pyrgiscus) virginica, new species, type 4.2 mm. 



5. Turbonilla (Pyrgiscus) powhatani, new species, type 5 mm. 



6. Odostomia (Evalea) pocahontasae, new species, type 2.4 mm. 



Plate 14. 



Fig. 1. Triphoris pyrrha, new species, type 2.7 mm. 



2. Cerithiopsis (Cerithiopsis) virginica, new species, type 2.9 mm. 



3. Diastoma virginica, new species, type 8.3 mm. 



4. Turbonilla (Pyrgiscus) pocahontasae, new species, type 5.7 mm. 



5. Turbonilla (Pyrgiscus) toyatani, new species, type 5.3 mm. 



