52 SCISSURELLA. 



S. CRISP ATA 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 strise 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, 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- 

 culuin not observed, the specimens now described being dead. 



Alt. O'l, diam. O'l. (Jeffreys.) 



North Atlantic. 



