JAPANESE MOLLUSKS, MYTILACEA. 139 



beaks, straight behind them ; beaks split ; chondrophore small, its 

 posterior butress curved, very oblique. Length 42*, alt. 19, diam. 

 14 mm. 



Kamakura (Stearns). 



Order PRIONODESMACEA. 



(Mytilacea). 



MYTILID.ff:, 



Mytilus crassitesta Lischke. J. M. C, I, p. 151, pi. 11. f. 1, 2. 



Akashi coast (Stearns). 



Mytilus giganteus Ilolmberg. Bull. Soc. Imp. Nat. Moscou, 1862, p. 422, pi. 11, 

 12. 



Inland Sea (Stearns) ; Nagasaki (Lischke). 



Mytilus grayanus Dkr. Dkr., Index, p. 221 ; ef. Lischke, J. M. C, I, p. 153, pi. 



10. f. 7, 8. 



Hakodate (Phila. Acad. coll. and Stearns). This may be Gould's 

 M. coruscus. 



Mytilus hirsutus Lamarck. Conchy). Cab., p. 40, pi. 7, f. 6. 



Inland Sea (Stearns) ; Nagasaki (Lischke). 



Mytilus sinuatus Dunker. Conchyl. Cab., p. 76, pi. 17, f. 7. 



Japan (Dunker) ; Inland Sea (Stearns). 



Mytilus curvatus Dunker. Conchyl. Cab., p. 34, pi. 14, f. 7, 8. 



Japan (Dkr.). 



Mytilus atratus Lischke. Jap. Meeres-Conch., II, p. 146, pi. 10, f. 45; Modiola 

 aterrima Dall, A. J. C, VII, p. 154. 



Nagasaki (Lischke) ; Bay of Yedo (Dall) ; 8. coast Prov. Ise 

 (Stearns). 



Mytilus coruscus Gld. Otia Conch., p. 177. 



Hakodate Bay, rocks between tide marks, common (Stimpson). 

 Mytilus mutabilis Gld. Otia Conch., p. 177. 

 Kagoshima Bay (Stimpson). 



Modiola modiolus Linne. Yedo, Hakodate (Lischke) ; Inland Sea (Stearns). 

 Modiola philippinarum Hanley. Rve., Conch. Icon., f. 1. 



Nemoto, Boshiu (Stearns). 



Several small specimens which seem to agree with this species. 

 Modiola traillii Reeve. Conch. Icon., pi. 4, f. 13. 



Idzu coast (Stearns). 



