MABINE MOLLUSCA. OF MABEIRA. 251 



are microscopically marked with spiral and longitudinal striae ; 

 the extreme tip is slightly immersed, small, bluntly rounded ; 

 the basal whorl of these four is slightly tumid, with a minute, 

 flatly spreading edge, from within which the regular growth of 

 the shell begins abruptly. Mouth slightly elliptical. Lip not 

 fully developed.— H. 0-] 4. B. 0-06. 



This is a singularly beautiful little shell ; among the Scalarias 

 of the Italian tertiaries there are some species that faintly recall 

 the Madeiran form ; among living species S. decussafa^ Kien. 

 (not Pease), alone has some slight features of resemblance, but 

 they are very slight. The sculpture is like wicker-work, and 

 hence the name of the species. I got only one young specimen 

 from 50 fms. in Punchal Bay. 



18. SCALAMA ASPERA, n. sp. 



Shell ruddy, small, high and narrowly conical, roughly fretted 

 on the whole surface, strongly ribbed, tuberculately carinated 

 within the rounded base, and with an oblique, impressed, and 

 crenulated suture. Sculpture — Longitudinals : there are on each 

 whorl up to the very top 10 or 11 strong, narrowish, rounded not 

 outspread ribs, running continuously with a slight trend to the 

 right from whorl to whorl down the spire, on either side of which 

 is one stronger than the rest, that on the outer lip being peculiarly 

 prominent ; the interspaces are rounded and slope up the sides 

 of the ribs ; towards the top of the spire they are nearly crowded 

 out by the ribs. Spirals : the whole surface of the shell is 

 covered by irregular, unequal, flattish rounded threads, of which 

 about 30 of the larger can be counted on the body-whorl ; but 

 there are others smaller past counting ; all these spirals, both 

 larger and smaller, are sharply densely crenellated by tooling 

 produced by minute tubercles which often run over into fine 

 longitudinal threads ; well within the base round the pillar runs 

 a very coarse string-keel which towards the lip is strongly con- 

 tinuous and rises on the ribs in low swoln rounded tubercles. 

 Colour a dull ruddy hue as if dusted over with a palish powder. 

 Spire high and narrow, with very straight profile-lines. Whorls 

 7, exclusive of the embryonic apex which is broken off; they 

 are small but not short, slightly hunchy beneath the suture, but 

 very slightly convex below. Suture oblique, impressed, and 

 rather strongly crenulated. Mouth circular, but a little flattened 

 on the upper inner side. Lip a minute sharp, not expanded 



19* 



