SCHISOMOPE. 61 



holes of a Haliotis. It bears much the same relation to Scissurella 

 that Trochotoma does to Pleurotomaria. The species inhabit deep 

 water ; there are a number of fossil forms described. A. Adams is 

 clearly in error in his use of the name Scissurella, instead of 

 Schisomope. 



S. cingulata 0. G. Costa, PL 57, figs. 1-7. 



Shell extremely minute, globose-turbinate, white, fragile, thin ; 

 spire very short and obtuse ; whorls 3, very convex, rapidly increas- 

 ing, sculptured with distant elevated radiating lamella? ; the last 

 whorl very large, globose, with longitudinal rather distant lamella? 

 the interstices decussated by numerous very fine growth lines and 

 spiral lirula? ; anal fasciole commencing on the last whorl opposite 

 the aperture, terminating in a long, narrow slit which does not attain 

 the edge of the peristome, its margins elevated, irregular, lamellar ; 

 aperture ovate, narrower above. Alt. "70 mill. 



Mediterranean. 



Scisurella cingulata Costa, Microd. Medit., p. 61, t. 12, f. 8, 9, 

 1861. — Schisomope cingulata Costa, Monts., Norn. Gen. e Spec, p. 

 39. — S. elegans Orb., of Authors, not of d'Orbigny. 



This seems to be the shell called " S. elegans Orb." by Woodward 

 and many others ; that species however is a fossil Scissurella ; 

 synonymous with it is S. striatula Philippi. The specimen from 

 which my description is drawn has a much longer, narrower foramen 

 than the figures (copied from Woodward) on pi. 57 show. 



S. ferriezi Crosse. PI. 22, figs. 43, 44, 



Shell umbilicate, turbinate-subdepressed, longitudinally and sub- 

 obliquely striatulate, yellowish-white ; spire short, obtuse ; whorls 

 3-3 5 r, the first 1? smooth, separated by simple sutures, the remaining 

 whorls rather plane, lamellosely bicarinate above the middle, 

 channelled between the carina?, the last whorl subdescending, a little 

 constricted just below the carina, then inflated, convex ; the groove 

 terminates a short distance behind the lip in an oblong foramen, 

 which does not attain the edge of the lip, a smooth space intervening. 

 Aperture ovate-rounded ; peristome simple, thin, acute, subcontin- 

 uous. Alt. 1*, diam. 2\ mill. (Crosse.) 



Noumea, New Caledonia. 



S. ferriezi Crosse, Journ. de Conchyl. 1867, p. 318, t. 11, f. 7. 



