SHELLS, 



CHITON (Linmeus). 



C. ruber, Linnseus, Syst. Nat. (12th edit.) p. 1107. 

 C. cinereus, O. Fabricius. 

 C. minimus, Spengler. 

 C. Isevis, Loven. 



C. albus, Linnaeus, Syst. Nat. (12th edit.) p. 1107. 

 C. aselloides, Lowe. 

 C. sagrinatus, Couthouy. 



PECTEN (Bruguiere) . 



P. Islandicus, Miiller (Ostrea) Zool. Dan. Prod. No. 2990. 

 Hob. Lievely, Greenland. 



LIMA (Bruguiere). 



L. subauriculata, Montagu (Pecten), Test. Brit. Supp. p. 63. 

 pi. 29. f. 2. 



L. nivea, Philippi. 

 L. sulcata, Brown. 

 L. sulculus, Leach. 



NUCULA (Lamarck). 



N. Portlandica, Hitchcock (PI. XXXIII. Fig. 3 a, b}. Nuc. 

 testa oblongo-ovata, gibbosiuscula, latere postico rotundato.. 

 antico subangulato contracto, rostrato, paululum hiante; al- 

 bicla, epidermide virescente cornea induta. 



Distinguished chiefly by a peculiar flexuous contraction of 

 the anterior side, which is beaked and slightly gaping at the 

 extremity. 



N. siliqua (PL XXXIII. Fig. 4 a, b) . Nuc. testa oblongo- 

 ovata, latiuscula, tenuicula, tumida, latere postico rotundato, 

 antico angulato-flexuoso, deinde concavo, et abbreviato-ros- 

 trato ; albida, epidermide cornea virescente-olivacea induta. 



Of the same typical form as N. Portlandica, swollen and 

 flexuously beaked, but of broader and more gibbous propor- 

 tions. 



