56 



at the sides, one primary tooth on each valve, though 

 sometimes only on one of them. Ligament exterior, at- 

 tached to callosities at the hinge, and without the irre- 

 gular plait of the Tellina. 



Psammotaea violacea Psammotaea serotina 



zonalis Candida 



pellucida tarenlina 



Psammotaea donacina. 

 [One fossil species.] 



TELLINA. 



TELLINA RADIATA. LlTinCBUS. 



Chem.6, tab. \\,fig. 100. 

 With a few divisions, this genus remains as Linnaeus 

 had arranged it. Shell transverse or orbicular, in gene- 

 ral flattened, the anterior side angular, exhibiting at the 

 margin a flexuous and irregular plaited or twisted ap- 

 pearance. One or two primary teeth on the same valve, 

 two lateral teeth, often distant: ligament quite external. 

 (La Marck has not mentioned, that upon the edge of 

 the front side of either valve, in some species, are rows 

 of serrated teeth, running from the apex to the margin, 

 as in the T. Foliacea and T. Spengleri). The valves are 

 not always of an equal size, or exactly uniform, being 



