148 JAPANESE MOLLU8K8, ARCACEA. 



Pinna lischkeana Clewin. Conchy). Cab., p. 73, pi. 28, f. 1. 



Yokohama (Rolle coll.) ; Inland Sea (Stearns) ; Tokyo Harbor 

 (Stearns). 



The smaller specimens collected on the western coast of the Inland 

 Sea agree with Clessin's figure (Couchylien Cabinet, pi. 28, f. 1) ex- 

 cept that the hinge-margin is less curved. The specimen figured by 

 Clessin as the adult P. japonic/a (Conchy 1. Cab., pi. 29, fig. 1) is in 

 my opinion an adult lischkeana. Whether the true japonica of 

 Hanley is the same as P. chemnitzii, or is the young of lischkeana, I 

 am unable to decide. Specimens collected by Stearns in Tokyo 

 Harbor agree with Clessin's figure (pi. 29, fig. 1). They measure, 

 length 375, breadth 204 mm. On the latter half of the shell the 

 prickly rays are wholly absent. 

 Pinna epioa Jouss. Le Naturaliste, XVI, 1894, p. 229. 



Japan (Jouss.). 



(Arcacea). 

 ARCIDJE. 

 Area navicularis Brag. Dkr., Index, pi. 14, f. 16, 17. 



Japan (Dkr.). 

 Area acnminata Kraass. 



The Japanese shells collected by Stearns seem to constitute a 

 variety, characterized by the less attenuated anterior end, posterior 

 lower angle less produced, the basal margin ascending to it, keel not 

 acute. This may be called var. subnormalis. 

 Area ocellata Reeve. Conohyl. Cab., p. 87, pi. 24, f. 1-4. 



Japan (Smith). 



Area kraussii Phil. SUdafrik. Moll., pi. 1, f. 11 ; Conch. Cab., pi. 35, f. 7, 8 ; Abbild., 

 Ill, p. 88, pi. 5, f. 8-10. 



E. coast of Japan, Tokyo to Awaji (Stearns) ; Nagasaki (Lischke). 



Area (Barbatia) obtusa Reeve. Conch. Icon., f. 77 and 80 (obliquata Rv. not Gray) ; 

 A. decurvata Lischke, J. M. C., I, p. 148. 



Nagasaki, Yedo (Lischke) ; Inland Sea (Stearns). 

 Area (Barbatia) tenebrica Reeve. Conchyl. Cab., p. 156, pi. 39, f. 7, 8. 



Nagasaki (Lischke). 

 Area stearnsii n. sp. PI. Ill, figs. 8, 9, 10. 



Shell small, subtrapezoidal, moderately inflated, solid ; anterior 

 half white, clouded with flesh color, posterior half fleshy-brown. 



