TAB. IX. 



Fig. 



1. Pectunculus glycimeris, page ^^. 



a. outside view of transverse var. 

 h. 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 costsje. 

 (J. hinge with full complement of teeth. 

 h. inside view of var. subobliquus. 

 i- outside ditto of ditto. 



2. Limopsis aurita, 7;. 70. 



c. var. /3. 



3. Limopsis pygmaea, p.l\- 



c. hinge magnified. 



