TAB. IX. 



Fig. 



1. Pectunculus glycimeris, page 66. 



a. outside view of transverse var. 



b. inside ditto of ditto 



c. hinge line of antiquated specimen, showing the obliteration of denticles 



by the advance of the ligament. 



d. outside of elongated var. 



e. magnified view of the young shell showing one tooth only, on each side 



of the dental area. 

 /. outside view of a young specimen, with distinct and elevated costse. 

 g. hinge with full complement of teeth. 

 h. inside view of var. subobliquus. 

 i. outside ditto of ditto. 



2. Limopsis aurita, p. 70. 



c. var. (3. 



3. Limopsis pygmsea, jy. 71- 



c. hinge magnified. 



