266 AMERICAN JOURNAL 



Subgenus CERASTODERMA, Morch. 



Cerastes and Cerastoderma, Poli, Test. utr. Sicil. 163, 1791. 



69. C. Californiense, Deshayes, Guerin's Mag. de Zool. t. 47, 



1841. 

 0. pseudofossile, Reeve, Icon. sp. 52, 1844. 

 C. blandum, Gould. Bost. Proc. iii, 276, 1850. 



N. Pacific Ocean, United States to Japan. 



70. C. Ciliatum, Fabricius, Faun. Groen., 410. 



Romer, Conch. Cab. 43, t. 7, f. 5, 6, t. 10, f. 1-3, 1869. 

 0. Islandicum, Chemn., Conch. Cab., vi, 200, t. 19, f. 195, 

 196. 



C. Arcticum, Sowb., Zool. Proc. 106, 1840. 

 C. pubescens, Couthuoy, Bost. Jour. Nat. Hist., ii. 60, t. 3, f. 6. 



Northern Atlantic Ocean. 



71. C. edule, Linnaeus, Syst. Nat. Edit, x, 681. 



Reeve, Icon. sp. 22, Rbmer 40, t. 7. f. 3, 4, t. 9, f. 17-21. 

 C. glaucum, Brug., Encyc. Meth. i, 220. 

 C. vulgare, Da Costa, Brit. Conch. 180, t. 11, f. 1. 

 C. rusticum, Chemn., Conch. Cab. vi. 201, t. 19, f. 197. 

 C. Baltieum, Beck. Reeve, Icon. sp. 113, 1845. 

 C. Eielnvaldi, Reeve, Icon. sp. 94, 1845. 

 O. pectination, Lara., (not Linn.), Anim. s. Vert. 

 O. crenulatum, Lam., Anim. s. Vert. 

 O. zonatum, Brown, Rec. Conch. 88, t. 35, f. 8. 

 C. Lamarckii, Reeve, Icon. sp. 93, 1845. 



Europe, Caspian Sea. 



72. Hayesii, Stiuipson, Proc. Phil. Acad. 142, 1863. 



Disco Isld., Nova Scotia. 



73. C. magnum, Born., Test. Mus. 46, t. 3, f. 5. 



Reeve, Icon. sp. 20, Romer, Conch. 45, t. 10, f. 4, 5. 

 C. maculatum, Gmelin, Syst. Nat. 3255. 

 C. ventrieosum, Brug., Encyc. Meth. 228. West Indies. 



74. C. pinnulatum, Conrad, Jour. Phil. Acad, vi, 260, t. 11, 



1'. 8, 1831. Northern United States. 



Subgenus SERRIPES, Beck. 



Verzeichn. d. Deutsch. Natiirf. in Kiel, 217. 



Aphrodite, Lea, Am. Philos. Trans, iv. 

 Acardo, Swains, Malac. 374, 1840. 



75. C. Fabricii, Deshayes, Zool. Proc. 333, 1854. 



C. G-roenlandicum, Var. Middendorff, Mai. Ross. 16, f. 6, 7. 

 Romer, Conch. Cab. 99, 1869. Siberia. 



