230 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



Genus CERITHIDEA Swainson. 



CERITHIDEA MONTAGNEI Orbigny. 



1841. Cet'ithiuvi montagnd Orbigny, Voy. Am. Mer., p, ^143, 

 pi. 63, figs, 3, 4. Gulf of California, and south to Panama 

 and Chile. 



Family CERITHIOPSID^. 



Genus SEILA A. Adams. 



SEILA ASSIMILATA C. B. Adams. 



1852. Cerithioptils asaimilata Adams, Panama Sh., pp. 150, 

 309.— SowERBY, Thes. Con., vol. 2, p. 881, pi. 184, fig. 246, 

 1855. Catalina Island, California, south to the Gulf of Cali- 

 fornia, Panama, and Sechura Bay, Peru. 



Family MODULID^. 



Genus MODULUS Gray. 



MODULUS PERLATUS Dillwyn. 



1817. Cat. Rec. 8h., vol. 2, p. 788. — Eydoux and Souleyet, 

 Voy. Bonite, Zool., vol. 2, p. 598, pi. 37, figs. 25-31, 1852. 

 Isla Puna, Guayaquil. Peru (Tschudi). 



Family PLANAXID^. 

 Genus PLANAXIS Lannarek. 



PLANAXIS PLANICOSTATUS Sowerby. 



1825. Tankerville Cat., app., p. xiii; Con. Icon., Planaxis^ fig. 

 26. Mazatlan, Mexico, south to Panama and the Galapagos 

 Islands. Peru (Tschudi). 



Family VERMETID.1^. 



Genus BIVONIA Gray. 



BIVONIA COMPACTA Carpenter. 



1864. Rep. Brit. Assoc, for 1863, pp. 628, 654; Ann. Mag. Nat. 

 Hist., 3rd ser., vol. 14, p. 427, Dec, 1864. (Unfigured.) 

 Vancouver Island, British Columbia, and southward to Paita, 

 Peru. 



Genus SERPULORBIS Saeco. 



SERPULORBIS SQUAMIGERUS Carpenter. 



1856. Proc. Zool. Soc, p. 226.— Tryon, Man., vol. 8, p. 181, 

 pi. 54, figs, 73, 74, 1886. San Diego, California, and south- 

 ward to Paita, Peru. 



