146 JAPANESE MOLLU8K8, PTERIACEA. 



Ostraea denselamellosa Lischke. Lischke, Jap. Meeres-Conoh., I, pi. 13, 14. 



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

 The 0. auriculata and 0. multicottata of Sowerby (Conch. Icon., pi. 

 25) seem to be the same. 



Ostraea folium Gmelin. Wakayama (Dkr.). 



Ostraea plioata Chemn. Kishiu coast (Stearns). 



Ostreea cucullata Born. Mus. Test. Ctes. Vind., pi. 6, f. 11, 12. 



Yokohama, E. coast Sagama (Stearns) ; Nagasaki (Lischke). 



I refer to this species a number of small specimens agreeing well 

 with Born's figures. 



Ostraea imbricata Lam. Dunker, Index, p. 250 ; Sowerby, Conoh. Icon., XVIII, 

 pi. 17, f. 36 b. 



Japan (Stearns, 1890). 



Ostraea hyotis Linn. 



(Stearns). A single valve of gigantic size, length 235, breadth 

 190 mm. 

 Ostreea rivularis Old. Lischke, J. M. C., Ill, pi. 1 4, f. 2, 3. 



Nagasaki (Lischke). 



(Pteriacea). 

 VULSELLIDJE. 



Vultella lingulata Linn6. Japan (Dkr.). 

 Vulsella minor Chemn. Japan (Dkr.). 



PTERIIDJE. 



(Pteria Scop. 1777 = Avicula Lam. 1799). 

 Pteria coturnix Dunker. Index, p. 228, pi. 10, f. 1, 2. 



Inland Sea (Dkr.). 



Pteria brevialata Dkr. Index, p. 229, pi. 10, f. 3-5. 



Inland Sea (Dkr., Stearns). 

 Pteria loveni Dunker. Index, p. 229, pi. 10, f. 6. 



Inland Sea (Dkr.). 



Pteria maoroptera Lam. Reeve, Conch. loon., X, pi. 2 and 3. 



Keu, Satsuma (Stearns) ; Prov. of Hizen (Stearns) ; Kagoshima. 



Two very large specimens, one from Satsuma being of the typical 

 macroptera form, the other having the short wing and less obliquely 

 extended pearl layer of " lotorium." The two measure : macroptera, 

 length of hiuge-line 225 mm. ; oblique length from beak to lower 



