Athyris concentrica. 



Fig. 8. View of dorsal valve showing spiral cones. Page 24 



Rhynchonella ptissacea. 

 Fig. 9. View of dorsal valve, showing spiral arm unrolled. Page 24 



PLATE I. 



LAMELLIBRANCHIATA. 



Modiola lithophaga. LINNE. 



Fig. 17. View of right and left valve. Page 25 



a. Dorsal margin. 



b. Anterior margin. 



c. Posterior margin. 



d. Posterior margin. 



Cytherea chione. LINNK. 



Fig. 3. View of left valve. Page 25 



a Anterior abductor. 

 a. Posterior abductor. 



e. Cardinal tooth. 

 d. Umbo. 



h. Hinge linament. 



f. Lunule. 



p. Pallial impression. 

 t\ Lateral teeth. 

 s. Sinus. 



Glycimeris siliqua. CHEMNITZ. 



Fig. 20. View of a left valve. Page 25 



a. Dorsal margin. 



b. Anterior margin. 



c. Posterior margin. 



NOTE. All figures on Plate I. are copied from "A Manual of the Mollusca. 

 A Treatise on Recent and Fossil Shells. By Dr. S. P. Woodward, A. L. S., F. 

 G. S., Second Edition. Lockwood and Co., London, England, 1871." 



