196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



Occurrence: Common at Panama and at Central American localities. 

 Often taken at extreme low tide on sandbars (Hertlein and Strong, 

 1943). Reinhart (1943) reports it from the Pleistocene of Santa Elena 

 Peninsula, Ecuador, and Hanna and Hertlein (1927) from the Pliocene 

 of Carmen Island, Gulf of California. One specimen in the Hancock 

 collection, dead when dredged, is labelled Ensenada, Mexico. 

 Distribution: Bahia de la Magdalena, Baja California, and Gulf of 

 California, to Brazo Ramon, Peru (5° 47' S, Frizzell, 1946). 



Anadara (Larkinia) multicostata (Sowerby) 1833 

 Text-figs. 8+ a-d 



Area multicostata Sowerby, Proc. Zool. Soc. London, 1833, p. 21. 

 Fig.: Reinhart, 1943, PI. 8, figs. 9-11. 

 Type loc: Golfo de Tehuantepec, Mexico; 12 fms. 

 Holotype: British Museum? 



Remarks: Young specimens have a faint depression across the umbones; 

 this seems to be a common condition in several species of Anadara (e. g., 

 A. cumingiana, A. biangulata, A. reinharti). The ribs are furnished with 

 minute pits, three to five in a row across the ribs. Between the rows of 

 pits are faint ridges, which also extend to the interspaces. Every pit has 

 a tiny periostracum flap, while the interspaces have only one larger flap 

 on the same level. On the oldest part of the shell the ribs on the left 

 valve are broader than those on the right. Living specimens have a 

 bright orange-colored flesh (information by Mr. John E. Fitch). 

 Occurrence: Taken down to 70 fms on various kinds of bottom: rock, 

 sand, coralline, etc. Lives apparently free upon the substratum. All 

 material at hand is either from the Gulf of California or the Galapagos 

 Islands. According to Reinhart (1943, p. 66), its occurrence in the 

 Pliocene of southern California (reported by Arnold, 1907, p. 544, and 

 Eldridge and Arnold, 1907, p. 32), is doubtful. 



Distribution: Newport Bay, California, to Panama. The Galapagos 

 Islands. (Hertlein and Strong, 1943.) 



Subgenus SGAPHARGA Gray 1847 



Scapharca Gray, Proc. Zool. Soc. London, 1847, p. 198. 

 Type of subgenus: Area inaequivalvis Bruguiere 1789 (orig.). 



