RISSOA. 88 



This pretty little shell has an oblong-acute ligure, is not 

 very strong, and is slightly translucent ; its surface has 

 some little lustre, and is of a yellowish white, either uni- 

 form in tint, or with a faintly indicated zone of fulvous at 

 the top, and near the base, of the body. Of the six volu- 

 tions, the body or final one is rather less than the united 

 length of the rest ; and of about equal length and breadth ; 

 the penult is rounded, swollen at its base, rather large in 

 proportion to all the other turns, and about twice as broad 

 as it is long ; the rest are convex, but shelve to a greater 

 extent above. The body compared to that of crenulata 

 is very narrow ; its basal declination is uninterruptedly 

 rounded and gradual. The suture is profound, or even 

 excavated. The sculpture, which extends to the anterior 

 extremity, consists of a fine but regular cancellation effected 

 by the intersection at right angles of moderately raised 

 perpendicular and spiral costellae ; the lattices are broader 

 than long, the perpendicular riblets being the more dis- 

 tant. There are four or five rows of the spiral raised 

 lines on the penult, and about eight or nine on the body, 

 on which last they are not undulated, nor are the longi- 

 tudinal ones at all crowded. The aperture is small, 

 rounded ovate, and occupies about two-fifths of the entire 

 length. The arcuated outer lip is marginated or thickened 

 behind, is solid, dentated outside by the termination of the 

 spiral riblets, and distinctly crenated internally ; it pro- 

 jects but little, and is not patulous anteriorly. The pillar 

 is pure white, not tuberculated, and the inner lip is not 

 much developed. The usual length is the eighth of an 

 inch, and the breadth nearly four- fifths of a line. Mr. 

 Barlee possesses a very coarsely cancellated example, with 

 but seven rows of spiral costelkc on the body, and three or 

 four only on tiie penult whorl. The Ufsual length is the 



