142 JAPANESE MOLLU8KS, PECTENACEA. 



Anomia cytaeum Gray. C. Icon., f. 10. 



Hakodate (Schrenck) ; Joga-Shiraa coast (Stearns). Large, 

 roughly sculptured specimens. Also a single silvery form (var. 

 argentea,) thinner, both valves entirely smooth except for slight 

 growth wrinkles. 



Anomia elyros Gray. C. Icon., f. 3, 9. 



Kii coast (Stearns). Two forms collected; one rather thin with 

 the upper shell orange or yellow, lower shell green, the other 

 heavier, opaque, both valves green. 



Placunanomia macroschisma Desh. Abbild., Ill, p. 132, pi. 1, f. 4. 



Yedo, Hakodate. 

 Placunanomia umbonata Gld. Otia Conch., p. 178. 



Kagoshima Bay (Stimpson). 

 Placenta placenta Linne. (Aimmia). Japan (Dkr.). 



(Pectenacea). 

 LIMIDJE. 



lima smith! Sowerby. Sowb., P. Z. S., 1888, p. 207, pi. 11, f. 12. 



Shell having the general outline and convexity of L. lima Linn., 

 thin but strong, slightly gaping anteriorly, entirely closed posteriorly ; 

 beaks situated near the posterior end of the hinge- line; cartilage pit 

 very oblique; hinge area narrow. Anterior auricles extremely 

 small, posterior auricles moderate, about as in L. lima. Surface of 

 valves sculptured with strong rounded radial ribs separated by in- 

 tervals of about their own width, and wholly absent on convexity of 

 the valves from the beaks nearly half the distance to basal margin. 

 Toward the heaks the surface on each side of the smooth area is 

 densely and finely radially striate, these strice subsequently uniting by 

 twos or threes to form the coarse ribbing of the later growth. Ribs at 

 the periphery 39 in number ; lacking on auricles and on the con- 

 cave face of the anterior slope. Dimensions : Height, from beaks to 

 ventral margin 60mm., length, antero-posteriorly, 46 mm., diameter 

 25 mm. Collected in Japan by Mr. Frederick Stearns in 1889-'90. 

 Originally described from Japan. Sowerby did not describe the 

 peculiar sculpture in detail, hence the above description. 



Lima dunkeri Smith. (L. japonica Dkr. not Ad.). Dkr., Index, p. 245, pi. 11, 

 f. 8, 9. 



Sea of Japan (Dkr.) ; Boshiu (Stearns). 



