48 



POPULAR CONCHOLOGY. 



divisions, but regarding its right place in the 

 system. Some have placed these shells with 

 the Cirrhipeda. Cuvier made them a separate 

 class, but still arranged them next in order. 

 Lamarck places them at the end of the Mo- 

 nomyaria, but merely as a division of that 

 order. Deshayes thinks they should form a 

 distinct order, and come before the Dimyaria : 

 this plan will be followed here, but the number 

 of genera will be the same as found in Reeve's 

 Conchologia Systematica ; the plan there pur- 

 sued appearing more simple than that adopted 

 or explained by other conchologists. 



This order is divided into 2 families, distin- 

 guished by the mode of attachment. 



Family 1.— Tendinosa* 



The muscle or pedicle by which these ani- 

 mals are attached to rocks, &c. gives them but 

 a limited sphere of action. —There are 2 ge- 

 nera. 



1. LiNGULA. — Shell thin, either horny or 

 calcareous, equivalve, equilateral, somewhat 



* From tendo 9 Lat., a tendon. 



