378 SHELLS AND SHELL-FISH. PART II. 



Cunicula Sw. Ovate oblong ; bosses thick, but de- 

 pressed ; cardinal teeth moderate. 



C. planulata. Lea. Am. rubiginosa. lb. pi. 8. f. 10. 



Tr. iii. pi. 9. f. 13. secura. lb. pi. 2. f.l7. 



patula. lb. p. f. purpurascens. Lam. vi. 1. 



20. p. 73. 



Ligumia Sw. Very long and pod-shaped ; bosses de- 

 pressed ; cardinal teeth moderate. 



S. recta. Lam. vi. 1. p. 74. 



Theliderma Sw. Posterior hinge margin elevated and 



winged ; surface of the valves tuberculated ; cardinal 



and lateral teeth perfect. 



T. metanerva Raf. nodulosa Wood. Gen. Conch, 



lachrymosa Lea. verrucosa Barnes. 



pustulosa Lea. Peruviana Lam. En. Meth, 

 irrorata Lea. 248. f. 7. 



Megadomus Sw. Only one lateral tooth in each valve ; 

 cardinal teeth two ; posterior hinge margin winged. 



M. gigas Sw. 



Mglia Sw. Shell generally cuneate; bosses moderate ; 

 cardinal teeth short, compressed, diverging towards 

 the anterior margin. 



JEglia Sw. Shell cuneate ; bosses prominent ; cardinal 

 teeth much compressed, placed on one side of the 

 bosses. 

 M. ovata Saij. Occidens Lea. Am. Tr. iii. pi. 10. 



Naidea Sw. Shell ovate ; bosses depressed ; cardinal 

 teeth short, thick, obtuse, placed immediately beneath 

 the bosses. 



N. ater Lea. Am. Tr. iii. pi. 7. 



Canthyria Sw. Shell ovate ; cardinal teeth long, com- 

 pressed ; surface of the shell spinous. 



C. spinosa ( U. spinosa Lea). Syn. frontisp. 



Mysca Turton. Shell elongated, oblong-ovate ; car- 



