NO. 2 rost: the family arcidae 195 



used but its limits seem uncertain. The abdominal sense organs in the 

 two species mentioned above, both of which are represented in the Han- 

 cock material, are similar (text-figs. 88-89). 



Subgenus ANADARA s. s. 



Anadara (Anadara) tuberculosa (Sowerby) 1833 

 PI. 13, figs. 17 a-b 



Jrca tuberculosa Sowerby, Proc. Zool. Soc. London, 1833, p. 19. 

 Syn.: fArca sunilis C. B. Adams 1852. 

 Type loc: Real Llejos, Nicaragua; mangrove roots. 

 Holotype: British Museum? 



Remarks: Carpenter (1863, p. 364), who had examined the type of 

 Area similis Adams, which has never been figured, considered it doubt- 

 fully a variety of Anadara tuberculosa. Hertlein and Strong (1943) 

 treat the two as different species and state that they are separable, at 

 least in adult forms. They describe Anadara similis as being relatively 

 lower, less angulated at the ends of the dorsal margin, and with the 

 posterior umbonal area less angular than in Anadara tuberculosa. They 

 illustrate A. similis on PI. 1, figs. 2 and 5. 



Occurrence: Abundant in mangrove swamps in shallow water. 

 Distribution: Bahia de Ballenas, Baja California, to Tumbes, Peru 

 (Hertlein and Strong, 1943). Olsson (1924) reports it as "very com- 

 mon along the entire coast" (of Peru). 



Subgenus LARKINIA Reinhart 1935 



Larkinia Reinhart, Bui. Brussels Mus. Roy. d'Hist. Nat,, vol. 11, 1935, 



pp. 41-42. 

 Type of subgenus: Anadara larkinii (Nelson) (Olsson, 1932, Miocene, 



Peru) orig. 



Anadara (Larkinia) grandis (Broderip and Sowerby) 1829 



Area grandis Broderip and Sowerby, Zool. Jour. London, vol. 4, 1829, 



p. 365. 

 Fig.: Maury, 1922, PI. 3, fig. 13; Reinhart, 1943, PI. 13, figs. 4-6. 

 Type loc: Panama Bay (designated by Hertlein and Strong, 1943). 

 Holotype: British Museum? 



