Mr. A. Adams on Japanese Species of Corbulidae. 365 



at Akasi, and a few which are intermediate between this 

 and C. vitreurrij and may be the latter with the point rubbed 

 off." 



5. Ccecum? mamillatum. 



" One large broken specimen from Akasi cannot be distin- 

 guished from the Crag fossil. The operculum has been forced 

 inwards by detrital matter till it occupies the place of the plug 

 which has perished." 



1. BrocMna glahriformis, 



" A series of dead but nearly perfect specimens agree exactly 

 with the Mazatlan shells. A few are almost identical with 

 the British shells in plug, but are a shade larger. It is quite 

 likely that the Pacific and Atlantic shells had a common 

 origin." 



2. BrocMna (? var.) glabella. 



" B. testa * B. glahrce ' simillima, sed majore, septo parum convexo, 



subplanato, apice inconspicuo. 

 " Long. -085, lat. -02. 



''''Hah. Akasi and Tanabe, Japan. (A. Adams.) 



'^ This may be only another variety of B. glabra on the 

 contrary side. The specimens were few, of the size of B. gla- 

 briformis^ and with the nearly flat plug of G. gracile.^'' 



Fam. Corbulidae. 

 Genus COEBULA, Brug. 



1. Co7-bnla erythrodon^ Lam. Hist. Nat. d. An. s. Vert. 



vol. vi. p. 138. 



Hab. Tatiyama, Yokohama. 



2. Corbula cuneata^ Hds. Moll. Voy. Sulph. pi. 20. f. 6. 

 Hab. Kifunsiri, Mososeki, Kuro-Sima. 



3. Corbula pallida^ Hds., Rve. Conch. Icon. pi. 2. f. 11. 

 Hab. Mososeki, 7 fathoms. 



4. Corbula venusta^ Gld. Otia Conch, p. 164 ; Schr. Moll. 

 Amur-Lande, pi. 25. f. 1-4. 



Hab. Gotto Islands, 48 fathoms ; Hakodadi Bay, 5 fathoms. 



5. Corbula bifrons^ A. Ad. Ann. & Mag. Nat. Hist. 1860. 

 Hab. Seto-Uchi ; Gotto ; Mino-Sima, 63 fathoms. 



