TORINIA. 21 



radiately striated, spirally sulcate ; umbilicus wide, margin 



numerously crenulated, umbilical wall with a spiral rib. 



Diam. 9 mill. 



Straits of Macassar. 



Easily known by the flatness of the shell and the two very 



prominent ribs about the peripher3^ Hanley's figure of this 



species in Thes. Couch, is a very poor representation. 



T. DiscoiDEA, Pease. PI. 6, fig. G. 



Shell ver3' depressed ; whorls finel}' granulated, sliglitl\' chan- 

 neled at tlie suture, spirally sulcate and ribbed, the two ribs of 

 the peripher}' being very strong; color white, clouded with very 

 faint chocolate; base rounded, umbilicus lightly crenulated, 

 channeled, umbilical wall with two spiral ribs. Diam, 6 3 mill. 



Faumotiis. 

 T. ASPERA, Hinds. PI. 6, figs. 1, 8. 



Shell discoidal, slightly conical ; wliorls rough, tubercular, 

 radiately striated, spirall}' sulcate, strongl}' ribbed on tiie per- 

 iphery; base rounded, umbilicus very wide, its margin numer- 

 ously crenulated. Diam. 9 4 mill. 



Straits of Macassar. 



The type of this species was a dead shell and conscquentlj'' 

 without color. 



T. ARcniT^, Costa. PL 6, figs. 9, 10, 11. 



Shell discoidal; whorls flat above, I'ounded below, channeled 

 at the suture, longitudinally and spirally sulcate, crenulated ; 

 color yellowish white ; umbilicus very wide, margin finel}' crenu- 

 lated. Diam. 7 "5 mill. 



Mediterranean. 



T. SowERBYi, Hanley. PI. 6, figs. 12, 13. 



Shell nearly discoidal ; whorls channeled at the suture, with 

 four granose cingulie, the upper three of which are equal and the 

 fourth greater, last whorl with 13-14 cingulse, periphery sloping 

 otf, not biangulate ; color yellowish white, clouded or varii gated ; 

 umbilicus moderate, its margins crenulated. Diam. 6 mill. 



Mediterranean, Tunis. 



This species is distinguished from the preceding b}' the much 

 more narrow umbilicus. 



