230 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 37. 
Genus CHRIDTAID EA Swans ome 
CERITHIDEA MONTAGNEI Orbigny. 
1841. Certthium montagner Orwieny, Voy. Am. Mér., p. 448, 
pl. 638, figs. 8, 4. Gulf of California, and south to Panama 
and Chile. 
Family CERITHIOPSID 2. 
Genus SEILA A. Adams. 
SEILA ASSIMILATA C. B. Adams. 
1852. Cerithiopsis assimilata ADAMS, Panama §h., pp. 150, 
309.—-SowmRBY, Thes. Con., vol. 2, p. 881, pl. 184, fig. 246, 
1855. Catalina Island, California, south to the Gulf of Cali- 
fornia, Panama, and Sechura Bay, Peru. 
Family MODULIDZ. 
Genus MODULUS Gray. 
MODULUS PERLATUS Dillwyn. 
1817. Cat. Rec. Sh., vol. 2, p. 788.—Eypoux and SOULEYET, 
Voy. Bonite, Zoél., vol. 2, p. 598, pl. 37, figs. 25-31, 1852. 
Isla Puna, Guayaquil. Peru (Tschudi). 
Family PLANAXID. 
Genus PLANAXIS Lamarck. 
PLANAXIS PLANICOSTATUS Sowerby. 
1825. Tankerville Cat., app., p. xiii; Con. Icon., Planawis, fig. 
26. Mazatlan, Mexico, south to Panama and the Galapagos 
Islands. Peru (Tschudi). 
Family VERMETID 2. 
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 Sacco. 
SERPULORBIS SQUAMIGERUS Carpenter. 
1856. Proc. Zool. Soc., p. 226.—Tryon, Man. =) VOl. On Damo 
pl. 54, figs. 73, 74, 1886. San Diego, California, and south- 
ward to Paita, Be 
