37 



PHOLADOMYA hesterna. 



TAB. DCXXIX. 



Spec. Char. Elliptical, transverse, gibbose, slightly 

 curved, obscurely ribbed ; ribs about 12, com- 

 posed of small tubercles ; beaks near the small 

 anterior extremity. 



Syn. Pholadomya candidoides, 8. V. Wood, Ann. 

 and Mag. Nat. Hist. v.Q. 245. 



Strongly resembling the recent P. Candida^ but the 

 posterior extremity is more rounded and the ribs smaller. 

 Some specimens are so much longer in proportion to their 

 v/idlh, and so distorted by fracture, that it is difficult to di- 

 stin<ruish them from P. Dixoni ; the short and more curved 

 anterior margin may assist in such cases. (See the lower 

 figure.) The specimens are in Mr. Wood's matchless 

 collection, and are from Ramsholt near Woodbridge. I 

 have ventured to alter the name with Mr. Wood's consent, 

 candidoides being only provisional and not regularly 

 formed. 



