52 SCISSURELLA. 



S. crispata Fleming. PI. 58, figs. 22-25. 



Shell globose, sloping toward the periphery, delicate, semitranspar- 

 ent, glossy ; the sculpture consists of numerous fine, curved, longi- 

 tudinal ribs, interrupted by the slit fasciole, closer on the base, 

 intersected by minute spiral stria? in the interstices ; color pearly 

 white ; epidermis thin, caducous, pale yellowish-brown ; spire usually 

 rather depressed, but variable ; whorls 4, flattened above, rapidly 

 enlarging ; slit long and narrow, nearly central ; slit fasciole deep, 

 striated across, edges somewhat thick, sharp, prominent; aperture 

 rounded, oblique ; peristome continuous ; outer lip thin ; inner lip 

 folded back on the columella ; umbilicus deep, but exposing only the 

 last whorl. Operculum very delicate, with numerous whorls, the 

 last large. Alt. 1, diam. 2 mill. 



Spitzbergen to Sicily and Azores, Greenland to New England, 4-790 

 fms. ; off Culebra, West Indies, 320 fms. ; Pliocene of Italy and 

 Rhodes. 



Scissurella crispata Fleming, Mem. Wern. Soc. vi, p. 385, t. 6, f. 

 3 j 1832.— Forbes and Hanley, Hist. Brit. Moll, ii, p. 544, t. 63, f. 

 6. — Jeffreys, Brit. Conch, iii, p. 283. — Sars, Moll. Arct. Norv., p. 

 126, t. 8, f. 7. — S. angulata, Loven, Ind. Moll. Scand., p. 20. — var. 

 paucicostata Jeffr., Brit. Conch. — S. aspera Phil., Enum. Moll. 

 Sicil. ii, p. 160, t. 25, f. 17 ; Conchyl. Cab., p. 35, t. 6, f. 6. 



Var. angulata Loven. Spire higher ; ribs above fewer. 



S. umbilicata Jeffreys. PI. 51, figs. 31, 32. 



Shell forming a depressed sphere which is equally raised above 

 and below, rather thin, semitransparent and somewhat glossy ; sculpt- 

 ure, none except very fine and close set, but indistinct, lines of 

 growth ; color white ; spire slightly raised ; whorls 4-5, flattened 

 above and sloping outwards ; they rapidly enlarge, so that the last 

 or body-whorl considerably exceeds in size the rest of the shell ; slit 

 long and central, equal in width, with upturned edges ; mouth nearly 

 circular, but somewhat angulated where it is united to the body- 

 whorl below the peripheral keel ; peristome continuous, although 

 not free in consequence of the inner lip being attached to the shell ; 

 outer lip thin and sharp ; inner lip spread on the lower part of the 

 body-whorl ; umbilicus rather large, funnel-shaped, and deep ; oper- 

 culum not observed, the specimens now described being dead. 



Alt. 0-1, diam. 0-1. (Jeffreys.) 



North Atlantic. 



