SANGUINOLARIA 



length of the two sides of each valve differs in different 

 species, the anterior in some, the posterior in other spe- 

 cies being the longer. Both extremities of the shell 

 gape a little, and the margins are not parallel to each 

 other, but are generally rounded. Two distinct cardinal 

 teeth are observable in each valve, but there are no 

 lateral teeth: the fulcrum,* or part of the shell to which 

 the ligament, which is external, is attached, is mostly 

 prominent, though less so in the type of the genus than 

 in the species we have associated with it. There are two 

 muscular impressions which are very irregular in shape, 

 and the impression of the muscle by which the mantle is 

 attached, has a large sinus. We have never seen the 

 epidermis of S. rosea, for which reason we do not assert 

 that it has any: its near resemblance in form and other 

 characters to the shells with which we have associated it, 

 induce us, however, to believe that it cannot be without 

 one. 



The species of this Genus are not numerous, they 

 are brought from the East Indies, New Holland, and 

 Jamaica: the S, rosea is a common shell; the other 

 species are, however, much more rare. 



In our plate we have represented at 



Fig- 1. Sanguinolaria rosea. Lam. Solen sanguinolentus. Linn. 



2. The hinge of the same. 



3. Sanguinolaria Diphos, — Salen Diphos, Chemn- et Nonnul. Solen 

 rostratus, Lam. 



4. Tlie hinge with the ligament of the same. 



* The Fulcrum, see Zoological Journal; vol' i. p. 218. 



