408 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Area idiodon Pils. and Johns. Plate XLII, figs. 3, 10. 



Pioc. A. N. S. Phila. 1917, p. 191. 

 Wilmington, N. C. 



Glycymeris acuticostatus (Sowerby) 



Pectunculus acuticostatus Sowerby, Q. J. Geol. Soc, vi, 1849, p. 53, pi. 10, fig. 



13. 

 Axincea acuticostaia Sby., Gabb, Tr. Am. Philos Soc. XV, p. 255. 



A very abundant shell. No. 2645 A. N. S. P. 



Glycymeris approximans (Gabb) Plate XLII, flgs. 7, 11, 1.3. 



Axina;a approximans Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 255. 



A very thin species having about 42 rather strong, rounded ribs, 

 crossed by delicate, equally spaced concentric threads. The hinge 

 is remarkably narrow, but httle curved, having 15 short but rather 

 high teeth. Margin with the deeply fluted band very narrow. 



Length 8.6, alt. 8.6, diam. of type valve 2.4 mm. 



Type and a smaller valve are no. 2650 A. N. S. P. 



There is another lot containing much larger but badly worn or 

 broken examples. The largest has an alt. of 21 mm., hinge with 

 about 18 teeth, the row interrupted mesially. 



Glycymeris santodomingensis Pils. and Johns. Plate XLII, figs. 12, 18. 



Proc. A. N. S. Phila. 1917, p. 192. 



Glycymeris diffidentise Pils. and Johns. Plate XLII, flgs. 8, 9. 

 Proc. A. N. S. Phila. 1917, p. 192. 



PINNIDAE. 



Atrina sp. undet. 



Pinna sp., Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 253. 



This species has more dorsal ribs than A. chipolana Dall. The 

 fragment is scarcely sufficient for specific definition. 



PTERIIDAE. 



Pteria inornata (Gabb.) Plate XLII. figs. 6, 7 



Avicula inornata Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 253. 



All the specimens are broken. The largest (type) measures 24.7 

 mm. long, as figured. It is strongly convex. There is also an in- 

 terval cast no. 2641, which shows the shape much better than the 

 shells (Plate XLII, fig. 7). 



Type and numerous imperfect valves, no. 2748 A. N. S. P. 



