67 



CUCULLiEA eiongata. 



TAB. CCCCXLVIL— >}^. 1. 



Spec. Char. Elongated, siibcylindrical, finely 

 striated ; anteriorly pointed ; posterior side 

 very short. 



JVearly three times as wide as long; the valves are so 

 deep as when closed to form an irregular cylinder ; the 

 beaks are small, incurved, and distant from the anterior 

 extremity ; the striae longitudinal and very fine. 



Collected at Cross Hands by the Rev. Mr. Steinhauer ; 

 the shells appear to have been found in the soft parts of 

 the Limestone, as they are empty. 



CUCULLtEA costellata. 



TAB. CCCCXLVll.-^^. 2. 



Spec. Char. Transversely oblong, gibbose, 

 longitudinally striated ; anterior lobe wing- 

 shaped, ribbed ; posterior side rounded, 

 ribbed ; beaks incurved, distant from each 

 other. 



J. HE general outline of this shell is an oblique parallel- 

 ogram, twice as long as wide, placed transversely ; the 

 striae are sometimes distant, at others very numerous, 

 and slightly decussated by the lines of growth ; each 

 extremity is distinguished by 3 or 4 small, sharp, rugged 

 ribs, the anterior ones have strong elevated striae between 

 them ; the anterior side or lobe is distinguished by the 

 keel-like termination of the central portion of the surface. 

 Siliceous casts of this neat shell are not unfrequent at 

 Blackdown ; it is also found at CoUumpton, in Devon- 

 shire. 



