58 MELEAGRINA. LIMA. PECTEN. 



muscle, as it is called, is found in the Persian 

 Gulf, the Gulf of Mexico. &c. The interior of 

 the shell is coated with thick pearl, and within it 

 are formed those globular substances known by 

 the name of pearls. 



" Family, Pectenida : genera — 



Pedum Only species, from India, rare. 



Lima Ostr^a. 



Plagiostoma. 



Pecten Ostrea, scallop . 



PUcatula Spondylus. 



Sj)ondylus. . . . Spondylus, thorny-oyster. 

 Podopsis. 



" The genus Lima is longitudinal, auricled, 

 or eared ; hinge without teeth, with a hollow re- 

 ceiving the ligament. These are very pretty 

 shells, generally white, almost transparent, re- 

 sembling the Pecten. Lima comes from the 

 American seas, and is a species easily obtained. 

 There are also several fossil species. 



'' Plagiostoma is wholly a fossil genus, of which 

 several species arefound in this country, in lias, he. 



" The pectens are so easily known that I need 

 only mention some fine species, such as P. pal- 

 lium, a splendid shell, from the Indian seas : 

 P. pleuronectes is a finely polished, smooth 

 species from the Indian Ocean. 



