FAMILY 8. CONCH ACEA (MARINA). 93 



Anini. sans vert., new edit., vol. vi. p. 343. Enc. Meth., pi. 268. 

 f. 1. a, b. 



PI. LXVIII. Fig. 3. 



Venus lamellata, Lamarck, Anim. sans vert., new edit., vol. vi. 

 p. 349. 



PI. LXVIII. Fig. 4. 



Venus subrostrata, Lamarck, Anim. sans vert., new edit., vol. vi. 

 p. 343. Enc. Meth., pi. 267. f. 7. 



PI. LXVIII. Fig. 5. 

 Venus gnidia, Broderip and Sowerby, Zool. Journ., vol. iv. p. 364. 



PI. LXVIII. Fig. 6. 



Venus plicata, Gmelin, p. 3276. No. 30. Lamarck, Anim. sans vert., 

 new edit., vol. vi. p. 341. Enc. Meth., pi. 275. f. 3. a, b. 



CYTHEREA, Lamarck. 



Testa sequivalvis, insequilateralis, suborbicularis, transversa vel trigona, 

 extiis aut laevis aut rugosa ; dentibus in valva altera tribus cardi- 

 nalibus, divaricatis, cum fovea remotiuscula, margini parallels ; in 

 altera quatuor, quorum unico divergente, remotiusculo, quasi late- 

 rali, in fovea valvse oppositse inserto. Impressio muscularis pallii 

 plerumque sinu. Ligamentum elongatum, externum. 



We have thought it useful to continue the genus Cytherea of La- 

 marck, although it must be confessed that the lateral or laterally diver- 

 ging cardinal tooth, the only character by which its shell is said to differ 

 from that of Venus, is sometimes almost obsolete. Lamarck himself, in- 

 deed, appears to have been involved in some confusion; for although the 

 two genera may be decided with tolerable accuracy, there are many of his 



