SOLENIMYA. 



each valve) which receive the ligament, have a callosity 

 running beneath each of them ; but the ligament enclosed 

 between the tooth and the edge of each valve, shows itself 

 also on the outside, enveloping the edge of the valve." 



Thus far Lamarck ; we have only to add, that besides 

 the two recent species which he describes, there is found in 

 the Calcaire Grossiere, in the neighbourhood of Valognes, 

 a small fossil species which we have named S. parvula, and 

 represented in our plate ; in its general form it approaches 

 very nearly to the S. mediterraneay but it is notched at the 

 umbo, a character in which it resembles the S. australis, 

 which, however, we have never seen. We therefore decline 

 giving a specific character of S. parvula. 



Fig. 1. 2. Soleniniya mediterranea. 

 3. — parvula. 



Shell inequilateral, inequivalve, transversely oblong, ob- 

 tuse at the extremities, covered with a shining epidermis 

 extending beyond the shell. Umbones not prominent, 

 scarcely distinct. A dilated, compressed, very oblique 

 cardinal tooth in each valve, slightly concave above, re- 

 ceiving the ligament. Ligament partly interior, partly 

 exterior. Two distant, irregular, lateral muscular impres- 

 sions. 



