252 PATELLID.E. 



A. Adams. It depends on conchological characters. 

 The apex of the shell turns backwards, instead of for- 

 wards or towards the head, which latter is the case with 

 Tectura and the other preceding genera of the same 

 family. The animal is blind, an infirmity that it shares 

 with T.fulva and the succeeding genus Propilidium. 



f I 5"gr LEPETA CJECA*, Miiller 



Patella caca, Mull. Prod. Z. D. p 237. ** Oq <| 



BODY whitish : tentacles setose : foot large : Zmr green 

 (Miiller and Stimpson). 



SHELL having an oval outline, moderately solid, opaque, 

 slightly glossy : sculpture, very numerous and close-set fine 

 striae, which radiate from tbe beak, and are crossed by slighter 

 concentric and imbricated striae, the intersection of which 

 causes tbe longitudinal striae to be granular or nodulous, 

 especially towards the margin; marks of growth distinct: 

 colour milk-white: beak blunt, much worn in full-grown 

 specimens : mouth oval : margin tbin and even, minutely 

 tuberculated in immature specimens : inside porcelain-white, 

 and partly iridescent : central scar large and conspicuous : 

 pallial scar rather broad and glossy, placed between the central 

 scar and the margin. L. O5. B. 0-35. 



HABITAT : Off Unst, in Shetland, at a depth of from 

 80 to 90 f., Mr. Dawson having found a fine and 

 fresh but sdmewhat broken specimen in sand which I 

 dredged there last summer. I should not be so well 

 satisfied of this evidence that it is British, if it had not 

 been confirmed by my discovering a smaller specimen 

 (having the dried remains of the animal in it) among 

 some of Tectura fulva which Mr. Barlee dredged on the 

 west coast of Scotland in 1846. He was never, as I 

 believe, acquainted with this species, nor had any shells 

 from Scandinavia, where it is rather common. I may 



* Blind. 



