378 



SHELLS AND SHELL -FISH. 



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. 



Megadomu.9 Sw. Only one lateral tooth in each valve ; 



cardinal teeth two ; posterior hinge margin winged. 



M. gigas Sw. 



JEglia Sw. Shell generally cuneate; bosses moderate ; 

 cardinal teeth shorty 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 Say. 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- 



