PLATE LV. 



[Part Yl.—Sejjtember 1887.] 



ig. 1. GiRASiA HOOKEHi, Gray. Spirit-specimeiij natural size. Khasi Hills. View 



of right side : c, cicatricial line marking the junction of the right and left 

 shell -lobes. 



1 o. Ditto : left side. 



1 b. Ditto : dorsal aspect. 



2, 2 a, 2 b. Ditto : shell of. 



•"5. AusTENiA GiGAS, Bs. Right side of animal from spirit-spcrimrn, natural size. 



3«. Ditto: view of left side. 



3 b. Ditto : viewed from the back, the portion within the apex of the shell cut off, to 



show more clearly the shell-lobes on the posterior margin : hd, herma- 

 phrodite ductj position of, passing back to the ovo-testes. 



4, 4 a, 4 6. Ditto : shell, natural size. 



