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 O. G. Costa. PI. 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 lamellae ; the last 

 whorl very large, globose, with longitudinal rather distant lamellae 

 the interstices decussated by numerous very fine growth lines and 

 spiral lirulse ; 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 dngulata COSTA, Microd. Medit., p. 61, t. 12, f. 8, 9, 

 1861. Schisomope dngulata 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 8. 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?, the first 1 smooth, separated by simple sutures, the remaining 

 whorls rather plane, lamellosely bicarinate above the middle, 

 channelled between the carinse, 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. H, diam. 21 mill. (Crosse.} 



Noumea, New Caledonia. 



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



