64 

 ANOMIA; 



CvjiBiFORMis, Lin. Trcms. viii. p. lo4. t 3. f. 6. 



Shell fub-ovate, fub-pellucid, white ; the upper valve con- 

 fiderably convex, contrafting at the umbo into a lengthened 

 beak> which is incurvated over the other valve ; it is flightly 

 wrinkled tranfvorfely, and foraetiraes a few faint longitu- 

 dinal undulated ftrice may be difcovered by the help of a 

 glafs. The lower valve as is ufual with fhclls of this nature 

 conforms in fliape to the body to which it is affixed : the 

 perforation is formed like that of cphippiwn. Length rarely 

 exceeding a quarter of an inch ; breadth fomewhat lefs. 



The fuperior valve of this fpecies was known to us long 

 before the publication of Tejiacea Britannica, but as in that 

 flate the genus could not be afcertained with any degree of 

 certainty, no mention' was made of it. In the fame defe(5tive 

 Hate Mr. Laskey found it in Scotland, and it was not till 

 very lately that we obtained a few perfe6l fpecimens on 

 Seriiilaria abietina, and aniennina, taken alive in deep water. 



It is well known to the Teflaceologift, that fhells of this 

 clafs being parafitical, are fubjedl: to much variety in growth ; 

 but in this the convexity of the fuperior valve is fufficient to 

 difcriminate it from the common fpecies ; fometimes a fpe- 

 cimen occurs of this valve which bears a ftrong refemblance 

 to a Patella, and not very unlike the young variety of P. 

 ungarica with the hook of tlie beak mutilated. 



- Since 



