4 NEW CHASTER : MARINE MOLLUSCA FROM TANGIER. 



differs in its smaller size, lustre-less and striated surface, basal 

 as well as umbilical striae, and much larger umbilicus. 



Cyclostrema fenestratum, sj). tiov., PI. I., Fig. i. 



Shell globosely conical, rather solid, white; sculpture, 

 numerous, slightly oblique, longitudinal, raised lines, of which 

 there are about thirty on the body whorl, these are crossed by 

 stronger spiral hues (six on the last half of the body whorl), of 

 which the uppermost is some distance from the suture, and the 

 lowest and strongest bounds the umbilical area ; the intercrossing 

 of these lines leaves squarish interspaces ; w horls three, very 

 convex, spire raised; suture deep; mouth circular (outer lip 

 broken) ; umbilicus large, fluted by the closely crowded 

 longitudinal lines. Height, -8 mm. Breadth i mm. 



A single specimen dredged. This species occupies a 

 position in some respects intermediate between C. areolatnm, 

 G. O. Sars, and C exilissimum, Phil., two forms at first sight 

 very unlike. The former it approaches in shape, though the 

 sculpture of the Tangier shell is much coarser. This surface 

 decoration however in its characters very closely resembles that 

 of C exilissimum, although it is finer, both the longitudinal and 

 spiral lines being more numerous : the shell is, of course, very 

 different in shape from Philippi's species. Another species 

 described by Philippi, the fossil Delphinula ? eUgantula apparently 

 differs only in having the longitudinal lines finer and closely 

 crowded not giving rise to any decussation. 



The Cyclostremata are well represented in the Tangier 



material, for, besides this species described, there occurred 



C. nitens, Phil., C. cuthrianum, Clark, C serimloides, Montg., 

 C. catenoides, Monts., and C. exilissimum. Ph. 



In conclusion, I must express my thanks to the courteous 

 editor, Mr. Wilfred Mark Webb, for the care he has bestowed 

 up)on the accompanying plate. 



SouTHPOKT, March jth, 1896. 



