146 JAPANESE MOLLUSKS, PTERIACEA. 



Ostrsea denselamellosa Lisihke. Liscbke, .rap. Meeres-Conch., I, pi. 1.3, 14. 



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

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

 25) seem to be the same. 



Ostrsea folium (imelin. Wakayama (Dkr.). 



Ostrsea plicata Chemn. Kishiu coast (Stearns). 



Ostraea cucullata Born. Mus. Test. Ctes. Vind., \A. 6, f. 11, 12. 



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



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

 with Born's figures, 



Ostrsea imbricata Lam. Dunker, Index, p. 250 ; Sowerby, Conch. Icon., XVIII, 



pi. 17, f. o6 b. 



Japan (Stearns, 1890). 

 Ostrsea hyotis Linn. 



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

 190 mm. 

 Ostrsea rivularis Gld. Liscbke, J. M. C, III, pi. 1 4, f. 2, :i. 



Nagasaki (Liscbke). 



{Pte7'iacea). 



VULSELLIDiE. 



Vulsella lingulata Linne. Japan (Dkr.). 

 Vulsella minor Chemn. Japan (Dkr.). 



PTERIID.ff;. 

 (P^Ti"« Scop. 1777 = Avicvla 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 macroptera Lam. Keeve, Conch. Icon., 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 " loiorium." The two measure : maa'optera, 

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



