206 PROCEEDINGS OP THE ACADEMY OP 



of the back of the shell, including the dorsal accessory plate, is very good, and 

 it is strange that the subsequent systematists, H. and A. Adams and Chenu. 

 who must have been acquainted with the character of this plate, still leave the 

 species in Dactylina. 



Genus Xvlophaga Turton. 

 Xylophaga, Turton, Concb. dith. Brit. p. 253, 1822. Gray, Zool. Proc. p. 188, 



1847. Gray, Ann. and Mag. Nat. Hist. 2d ser. p. 380, 1851. H. and 



A. Adams, Genera, ii. p. 326. 

 Teredo, Turton, Conch. Diet. 1819. 



Pholas, Deshayes, in Lamarck, An. sans Vert. vi. 1835. 

 Xylotrya, Leach, teste Menke, Syn. ed. 2, p. 121, 1830. Gray, Syn. Brit. Mus. 



p. 76, 1842. 



X. do r s a 1 i s, Turton. 



Xylophaga d o r s a 1 i s, Turton, Conch, dith. Brit. p. 253, t. 2, f. 4, 5. H. and 



A. Adams, Genera, iii. t. 89, f. 4, 4a be. Alder, Cat. Northumb. Moll. 



p. 101. Brown, 111. Brit. Conch, p. 117, t. 50, f. 813. Catlow, 



Conch. Nomenc. p. 3. Chenu, Man. ii. f. 20, 21. Chenu, Encyc. Hist. 



Nat. Moll. t. 241 244. Fischer, Journ. Conch. 2d ser. iii. p. 49. 



Fleming, Brit. Anim. p. 455. Forbes and Hanley, Brit. Moll. i. p. 90. 



t. 2, f. 3, 4. Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 382. 



Hanley, Desc. Cat. p. 10. Jay, Cat. 4th ed. p. 9. Reeve, Conch. Syst. 



t. 22. Sowerby, Genera of Shells. Sowerby, Conch. Manual. 



Sowerby, Illust. Brit. Shells, t. 1, f. 7. Sowerby, Monog. Xylophaga, 



Thes. Conch, ii. p. 503, t. 108, f. 103, 104. Thorpe, Brit. Mar. Conch. 



p. 32. 



Teredo dorsalis, Turton, Conch. Diet. p. 185, 1819. 



Pholas xylophaga, Deshayes, in Lam. Anim. sans Vert. vi. p. 47, 1835. 



Hab. England. 



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



X. glob os a, Sowerby. 



Xylophaga globosa, Sowerby, Zool. Proc. p. 110, 1835. Sowerby, Monog. 

 Xylophaga, Thes. Conch, ii. p. 503, t. 108, f. 101, 102. H. and A. 

 Adams, Genera, ii. p. 327. Catlow, Conch. Nomenc. p. 3. Chenu, 

 Man. Conch, ii. f. 22, 23. Fischer, Journ. Concb. 2d ser. iii. p. 49. 

 Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 382. Hanley, Desc. 

 Cat. p. 10. Jay, Cat. 4th ed. p. 9. 

 Pholas yibbosa, D'Orbigny, Voy. Amer. Merid. Moll. p. 501. Gay, Hist. Nat. 



Chili, viii. p. 381. 

 Hab. Valparaiso; inhabiting wood at sixty fathoms. 

 Coll. J. C. Jay, M. D. 



This shell very closely resembles the English species, but may be distinguished 

 by its more depressed dorsal margin, by its greater posterior length, and by the 

 longitudinal portion of the ventral margin being slightly convex in outline, 

 whilst in X. dorsalis this margin is concave. 



Xylophaga car diss a, Gould, Otia Conchologica, p. 241, Feb., 1862. 



Hab. Mergive Archipelago. 



Coll. Dr. A. A. Gould. 



I owe to Dr. Gould the pleasure of examining specimens of this new form of 

 Xylophaga, which is very distinct from the other species of the genus. 



Genus Talona, Gray. 



Talona, Gray, Syn. Brit. Mus. 1840. Gray, Proc. Zool. Soc. p. 188, 1847. 



Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 381. H. and A. Adams, 



Genera, ii. p. 329. 

 Pholas, (part.) Spengler, Sowerby, Hanley, etc. 



[April; 



