38 



S. OANDIDTJS REMERI. S. STRIGIIATUS. Turton. 

 B.p. 97. t. 6./. 13. Mart. f. 43. F. p. 439. 

 Elongated oblong, breadth twice and a half the length, 

 ends rounded, uniform white, marked with coarse ridges 

 of growth, and anteriorly with curved radiating strigils ; 

 beaks subcentral, anterior slope with divaricating stria? ; 

 ventral edge straightish, subiricurved in the middle; 

 an oblique and erect tooth in each valve (in one valve 

 the former rudimentary) nymphsc distinct. 0,80... 1,6. 

 Cornwall. 



S. SCOPULA. PSAM. SCOPULA. Turt. B. p. 98. t. 

 6./. 11,2. F. p. 439. Kidney-shaped, subequila- 

 teral, oblong, glossy white, ventral edge strongly incur- 

 ved in the middle, striated in two directions anteriorly 

 (oblique striae not more than 20.) : all the teeth erect. 

 I...I. Exmouth. 



GENUS. PANOPEA. 



Eguivalve ,transverse, unequally gaping at the ridges, 

 a conical cardinal tooth in each valve, and on one 

 side a short ascending compressed, not exserted 

 callus. Ligament external, fixed on the callosities. 

 P. ARCTICA. Deshayes. GLYCIMERIS. A. Lam. 2. 



PGHLYCIMERIS. Bean in Mag. N. H. 8. /. 51. p. 



563. White under a yellowish wrinkled epidermis, 



