PART II. 



SOLENIN^. MY A. 



367 



internal and external : representing Pandora and 

 Glycymeris. Epidermis thin, shining, dilated. 

 S. Mediterranea. Sow. Gen. f. 112. (/^. 116. a.) 



My A Linn. Shell thick, ventricose, ovate, transverse, 

 one end truncated and gaping ; umbones generally 

 nearly central and prominent ; cardinal tooth gene- 

 rally large ,• spatulate valves often gaping. 



117 



Anatina Lam. Hyaline, thin ; cardinal tooth spoon- 

 shaped, sometimes with a transverse internal append- 

 age, or plate, like an additional tooth, (^fig. 11 6./.) 



M. subrostrata. En. M^th. 228. f. 3. 



Mya Linn. Shell thick, strong ; cardinal tooth spatu- 

 late ; both extremities gaping * ; cardinal teeth ^. 

 M. truncata. En. Meth. 229. f. 2. {fig. 117. h,c.) 



Panopia Lam. Resembling Mya ; cardinal teeth -i, 

 acute ; ligamental margin greatly thickened ; liga- 

 ment external. (/(/, ll6. c.) 



P. Aldrovandi. Sow. Man. f. 65. 



Corhula. Inequivalve, ovate ; umbones central, one 

 more prominent than the other ; valves not gaping ; 

 cardinal teeth \, bearing the ligament : leading to 

 Mactra. (117. e,/.) 

 'Sulcata. En. Meth. 230. f. 1. C. nucleus. Sow. Man. 89. 



* Connected to Anatina by Anaiina rupicola Lam, 



