JAPANESE MOLLUSKS, ARCACEA. 149 



Dorsal margin straight and long, angled at each end, basal margin 

 curved, not gaping, posterior end sloping, straight, anterior end 

 rounded ; posterior lower angle produced. Surface closely and finely 

 decussated throughout, the radii coarser on posterior slope. Teeth 

 about as in A. decussata; area narrow, deep. Interior fleshy with 

 linear brown and whitish radii, and clouded with white, the muscle- 

 scars brown. 



Length 16, alt. 9'2, diam. 7 mm. 



Length 18, alt. 11, diam. 10 mm. 



Nemoto, Boshiu and Yokohama (Stearns). 



Hinge much straighter than in A. tenebrica Rve., and angled at 

 the ends, the baso-posterior extremity more angular. Sculpture 

 finer than in young A. decussata, and less rounded posteriorly. 

 Area (Barbatia) decussata Sowerby. Conchyl. Cab., p. 144, pi. 37, f. 2-5. 



Nagasaki (Lisckke). Several specimens collected by Stearns. 

 Area (Barbatia) domingensis Lam. Conchy]. Cab., p. 195, pi. 47, f. 12. 



Nagasaki (Lischke). 

 Area (Anomalocardia) granosa Linne. Conchyl. Cab., p. 38, pi. 3, f. 7. 



Kodzuka (Stearns) ; Nagasaki (Lischke). 

 Area (Anomalocardia) pulchella Dkr. Novit. Conch., p. 113, pi. 38, f. 6-9. 



Japan (Dkr.) ; East coast of Nippon (Stearns). 



Area (Anomalocardia) inflata Reeve. C. Icon., f. 30 : Conchyl. Cab., p. 30, pi. 10, 

 f. 1, 2. 



Tokyo Bay (Stearns) ; Yedo, Nagasaki, Hakodate (Lischke). 

 Area (Scapharca) satowi Dkr. Index, p. 233, pi. 9, f. 1-3. 



Tokyo. 

 Area (Scapharca) subcrenata Lischke. Jap. Meeres-Conch., I, p. 146, pi. 9, f. 1-3 



('M. nodoso-crenata" on plate). 



Yedo and Nagasaki (Lischke) ; Inland Sea (Stearns) ; Itoma 

 Jima I., Loo Choo group (Stearns). 

 Area (Scapharca^ ambigua Reevt,. C. Icon., sp. 65. 



Yokohama (Dunker) ; Nagasaki (Lischke). Mr. Stearns* speci- 

 mens are all smaller than Reeve's figure of this species. 



Area (Scapharca) japonioa Reeve. C. Icon., f. 32 ; Conchyl. Cab., p. 114, pi. 30, f. 

 3,4. 



Japan (Siebold). 



Area (Scapharca) troscheli Dkr. Index, p. 234, pi. 14, f. 14, 15. 

 Japan (Dunker). 



