MYA, 221 



proximated ; epidermis greenish-yellow or ol- 

 ive-brown, with dark-green rays finely striated 

 transversely ; surface smooth and shining. Di- 

 mensions about one inch and a half by two and 

 a half. 



Viucronata, shell ovate, broader behind ; base 

 compressed, falcate ; beaks small, elevated; 

 acute ; purple within ; anterior lunule long, 

 posterior one small ; epidermis horn-colour and 

 obscurely rayed, smooth. Dimensions one inch 

 and a quarter by two and a quarter. 



inflate, shell oval, thick, tumid ; beaks broad ob- 

 tuse behind, wedge-form before j pearly- white 

 within ; epidermis yellowish-green, rayed. Di- 

 mensions one inch and three quarters by three 

 and a quarter. 



ventricosd) shell large, thick, triangular, ovate, 

 convex ; bosses large, round, prominent ; beaks 

 recurved ; cavity capacious ; epidermis yellow- 

 olive, with green rays ; surface smooth and 

 shining ; pearly-white within. Dimensions 

 about three inches by four. 



tiiliquoidea, shell long-ovate, subcylindric, thick, 

 regularly rounded, rayed; beaks elevated ; cavi- 

 ty small ; inside white ; epidermis yellowish- 

 olive, rayed with distant dark-green lines Di- 

 mensions two inches by three and a quarter. 



plana, shell rhomb-oval ; thin, beaks depressed ; 

 disks flattened compressed ; teeth slightly ele- 

 vated, smooth ; epidermis brown-yellow, deeply 

 wrinkled Dimensions two inches and three 

 fourths by four and three fourths. 



triagguiaris, shell triangular, gibbous-inflated, ray- 

 ed, gaping ; anterior slope flattened, ribbed, caa- 



