164 LITTORINIDiE. 



S. i CUTLERIANA, Clai'lv. 



Orbicular, spirally striated througliout, pure white ; umbilicus 

 not ribbed. 



Plate LXXXVIII. fig. 3, 4. 

 Skenea Cutleriima, Clark, Annals Nat. Hist. New series, vol. iv. p. 424. 



Of this rare shell we have only seen two specimens, 

 which were kindly forwarded to us by Mr. Clark, but 

 unfortunately reached us so late, that we have been 

 unable to search as thoroughly as we ought into the 

 works of foreign writers. We do not consider them iden- 

 tical with the Delj)Mmda f elegantula of Philippi. 



The shape is orbicular, with the spire decidedly raised, 

 so as to occupy nearly one-third of the total height. The 

 shell is very thin, semi-transparent, and of a somewhat 

 glossy subnacreous or pinkish white ; it is encircled 

 throughout with regular and moderately close stria?, which 

 upon the middle of the body are apparently more remote 

 and slightly broader. There are scarcely three whorls ; 

 they rapidly enlarge both in width and height, ter- 

 minate in an obtuse apex, and are divided by a fine 

 sutural line, which, however, is very distinct, owing to 

 the great convexity of the volutions ; these are not sym- 

 metrical in their roundness, since, whilst the lower shelve 

 is more or less abrupt, the upper portion of the turns is 

 horizontally depressed (but not angularly shouldered). 

 The body is ventricose, its circumference rather broadly 

 rounded, and its base decidedly convex. The rather ab- 

 rupt umbilicus is not ribbed, and does not display any 

 of the internal coils. The large and laterally projecting 

 mouth is almost circular, and occupies four-sevenths of 



