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 PR10NODESMACEA. 



(Mytilacea). 

 MYTILID2E. 



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

 Akashi coast (Stearns). 



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

 12. 



Inland Sea (Stearns) ; Nagasaki (Lischke). 



Mytilus grayanus Dkr. Dkr., Index, p. 221 ; cf. 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. Oonchyl. Cab., p. 40, pi. 7, f. 6. 



Inland Sea (Sjearns) ; Nagasaki (Lischke). 

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



Japan (Dunker) ; Inland Sea (Stearns). 

 Mytilus ourvatus 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 Ball, A. J. C., VII, p. 154. 



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

 (Stearns). 

 Mytilus ooruscus 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 trailiii Reeve. Conch. Icon., pi. 4, f. IS. 

 Idzu coast (Stearns). 



