234 T. C. Brown — Fauna from Ohappaquiddick Island. 



A portion of a right valve, probably of this species, is present 

 in a fragment of the ferruginous concretion (fig. 11). It is 

 very much flattened, more or less irregular, with large byssal 

 opening and indications of very faint concentric growth lines. 



This species is represented by several complete or nearly 

 complete left valves, varying greatly in size, the length ranging 

 from ten to thirty millimeters. It resembles very closely the 

 modern A. simplex from the shores of Long Island. It has 

 the same general outline and shape, and approaches that species 

 in size and in the absence of surface plications and other orna- 

 mentations. 



Anomia paucistriata sp. n. PI. VIII, fig. 12. 



Shell subcircular, somewhat irregular ; left valve convex, 

 nearly equilateral ; beak submarginal, dorso-medially placed 

 and not prononnced ; surface marked by a few faint radiating 

 striations, crossed and cancellated by very fine concentric lines 

 of growth. 



This species is smaller than the preceding, averaging in 

 length about ten to twelve millimeters. It is represented by 

 several left valves. Right valve unknown. 



Glycymeris sp. ?. PI. VIII, fig. 13. 



Represented by several internal molds not preserving char- 

 acters sufficient for specific description. The figure shows the 

 internal characters of the shell and is drawn from a wax im- 

 print made from a mold. 



This species is smaller and more ovate in form than G. 

 idoneus Conrad, from the JSTanjemoy and A quia formations of 

 Maryland. In size, form and general appearance it resembles 

 more closely Glycymeris ( Pectunculus) decussatus Sowerby, 

 from the Eocene of England. 



Nucula sp. ?. 



Represented by a few small internal molds. In one at least 

 the dental characters are very well preserved. In general out- 

 line these resemble very closely N . potomacensis Clark, from 

 the Eocene of Maryland, but do not preserve sufficient charac- 

 ters for specific identification or description. 



Turritella sp. ?. PI. VIII, fig. 4. 



Shell small, spire high, angle about twenty-five degrees 

 each whorl marked by a distinct, w^ell-defined anterior and 

 less prominent posterior spiral carinate ridge, following around 

 above and below the suture, otherwise the surface is smooth 

 and free from ornamentation ; suture distinct ; whorls closely 

 placed and rapidly increasing in size. 



