182 BIVALVES 



it is supposed that they are supports for the 

 animal. The Terebratulae inhabit the depths of 

 the ocean : they are parasitical, being attached 

 to various submarine substances by a tough 

 short stalk, which differs from the ligament of 

 the Anomia in being formed of numerous closely 

 united fibres, separating a little at the end, by 

 which they are attached to the stone. The 

 mollusca inhabiting these shells are remarkable 

 for two long fringed arms, rolled up in a spiral 

 form within the shell when at rest, but which 

 they protrude when hunger prompts them to 

 seek for their food. 



ANOMIA Ephippium* 

 WRINKLED ANOMIA. 



Specific character. Shell suborbicular, irre- 

 gular, wrinkled, sinuous at the margin ; inside 

 pearly and iridescent ; colour yellow, reddish, 

 or white ; varies from two to three inches in 

 diameter. 



This shell belongs to the division still bearing 

 the name of Anomia. It adheres to other bodies, 

 and particularly oysters, and receives the im- 

 pression of the substances to which it is affixed, 

 its form being modelled by the circumstances 

 under which it adds to its size. Some specimens 

 have been taken from the Pecten Maximus 

 exhibiting clearly the impression of its ribs. 



* Plate X. figure 1. 



