210 PROCEEDINGS OP THE ACADEMY OF 



closely allied. It may eventually prove to be a mere variety of that shell. The 

 absence of a posterior accessory plate prevents this species from being placed 

 in the genus Pholas, where it is nearly allied to P. tr un c at a. 



B. Erythraea, Gray. 



Barnia Erythrasa, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 382, 1851. 



Barnea Erythrasa, H. and A. Adams, Genera, ii. p. 326. 



Ilab. Red Sea. 



This shell, which has not yet been figured, seems to be allied to B. s i m i 1 i s, 

 but is probably distinct. 



B. s i m i 1 i s, Gray. (Sp.) 



Pholas s i m i 1 i s, Gray, in Yates' New Zealand. Catlow, Conch. Nomenc. p. 4. 

 Jay, Cat. 4th edit. p. 10. Sowerby, Monog. Pholas, Thes. Conch, ii. p, 

 48*7, t. 103, f. 1214. 



Barnia similis, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 382. 



Barnea similis, H. and A. Adams, Genera, ii. p. 326. Fischer, Journ. Couch. 

 2d ser. iii. p. 49. 

 Pholas antipodum, Philippi, Zeitschr. fur Malak. p. 71, 1847. 



" antipodarum, Philippi. Gray, Ann. and Mag. N. Hist. 2d ser. viii. p. 382. 

 1851. 

 Hab. New Zealand. 

 Coll. Acad. Nat. Sciences. Coll. J. C. Jay, M. D. Coll. G. W. Tryon, Jr. 



Genus Navea, Gray. 



Navea, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 385. 



N. n u c i f e r a, Fabricius (sp.) 



Pholas nucifera, Fabricius. Spengler, Skrivt.Nat. iv. p. 40, t. 10, f. 4, 9. 

 Fischer, Journ. Conch. 2d ser. iii. p. 50. 



Navea nucifera, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 385. H. and 

 A. Adams, Genera, ii. p. 328. Murch, Cat. p. 2. 

 According to Dr. Gray, resembling tenuis, but appears to be shorter in 

 front and longer and more rounded behind. 



N. s u b g 1 o b o s a, Gray. 



Navea subglobosa, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 385, 

 1851. Chenu, Man. Conchyl. ii. f. 28,29. H. and A. Adams, Genera, 

 iii. t. 89, f. 6, 6, a, G, b. Fischer, Journ. Conchyl. 2d ser. iii. p. 50. 

 Hab. California. 



N. tenuis, Gray. 



Navea tenuis, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 385, 1851. H. 



and A. Adams, Genera, ii. p. 328. Fischer, Journ. Conchyl. 2d ser. 



iii. p. 50. 

 Hab. ? 



Genus Zirph^ea, Leach. 

 Zirph/Ka, Leach. H. and A. Adams, Genera, ii. 



Zirfced, Leach. Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 385, 1851. 

 Z. constrict a, Sowerby (sp.) 

 Pholas contricta, Sowerby, Proc. Zool. Soc. p. 161, 1849. Sowerby, Monog. 



Pholas, Thes. Conch, ii. p. 489, t. 104, f. 27, 28. 

 Zirphasa constrict a, H. and A. Adams, Genera, ii. p. 327. Fischer, Journ. 



Conch. 2d ser. iii. p. 50. 

 Zirphaea constrict a, Gray, Ann. and Mag. N. H. 2d ser. viii. p. 385, 1851. 

 Hab. Straits of Sunda. 



[April, 



