No. 1704. A COLLECTION OF SHELLS FROM PERU—DALL. RUS 
Family MESODESMATID. 
Genus MESODESMA Deshayes. 
MESODESMA DONACIUM Lamarck. 
1818. Mactra donacia Laanos, An. s. Vert., vol. 5, p. 479.— 
Cuenu, Man., vol. 2, p. 79, fig. 341, 1862. Sechura Bay, 
Peru, south to Valparaiso, Chile. 
Superfamily MYACEA. 
Cry ptornega cahligorne Cow Comrad- Vlegretos, Peru ; O£.23 
Family CORBULID. 
Genus CORBULA Bruguiére. 
CORBULA BICARINATA Sowerby. 
1833. Proc. Zool. Soc., p. 85.—ReEEvVE, Conch. Icon., Corbula, 
pl. 3, fig. 23, 1844. Panama to Guayaquil. 
CORBULA BIRADIATA Sowerby. 
1883. - Proc. Zool. Soc., p. 35.—REEVvE, Con. Icon., Corbula, 
pl. 1, fig. 3, 1844. Gulf of Panama to Guayaquil. 
CORBULA NASUTA Sowerby. 
1833. Proc. Zool. Soc., p. 35.—REEVE, Con. Icon., Corbula, 
pl. 1, fig. 1, 1844 (not of Conrad). Gulf of Panama to Jipi- 
japa, Ecuador. 
CORBULA OVULATA Sowerby. 
1833. Proc. Zool. Soc., p. 35.—REEVE, Con. Icon., Corbula, 
pl. 1, fig. 7, 1844. Gulf of Panama to Guayaquil. 
Family SAXICAVID. 
Genus SAXICAVA F. de Bellevue. 
SAXICAVA PURPURASCENS Sowerby. 
1834. - Proc. Zool. Soc., p. 88; Thes. Con., Saxicava, p. 183, 
pl. 471, fig. 7, 1884. Bay of Guayaquil. 
SAXICAVA SOLIDA Sowerby. 
1834. Proc. Zool. Soc., p. 88; Thes. Con., Saricava, p. 138, 
pl. 471, fig. 12, 1884. Bay of Guayaquil and south to Punta 
Arenas, Magellan straits. 
Family GASTROCH ANID. 
Genus GASTROCHAINA Spengler. 
GASTROCHENA DENTICULATA Deshayes. 
1854. Proc. Zool. Soc., p. 327; Thes. Con., Gastrochena, p. 129, 
pl. 470, fig. 7, 1884. Ecuador coast. 
GASTROCHANA OVATA Sowerby. 
1834. Proc. Zool. Soc., p. 21; Thes. Con., Gastrochena, p. 128, 
- pl. 470, fig. 9, 1884. Panama to La Plata Island, Ecuador. 
Also Atlantic. 
