I.IOTIIIU-:. 17 



FAMILY LIOTIIDJE. 



Head proboscidiform, epipodial line with a pair of conical lobes 

 and three pairs of cirri. Dentition ? 



Shell turbiniform or discoidal, white, with longitudinal ribs or 

 clathrate; aperture feebly nacreous, peristome continuous, thick, 

 with a callous varix. Operculum niultispiral, hispid, corneous, 

 witli a calcareous layer formed of pearly particles spirally disposed. 



Genus LIOTIA, Gray. 1842. 



( Imracters those of the family. 



Tropical and subtropical seas. L. PERONII, Kiener. 



Section ARENE, H. and A. Adams. 1854. 



Ornamented with reddish radiating markings, periphery spinosely 

 carinated. L. R ADI ATA, Kiener. 



Subgenus LIOTINA, Munier-Chalmas. 1877. 



Shell solid, cancellated, subdiscoidal, umbilicus large, with a 

 spiral funiculum, aperture not. nacreous, peristome varicose, re- 

 flected, sub-bilabiate. L. AUSTRALIS, Kiener, is a living represen- 

 tative ; otherwise the group is Eocene. 



? Subgenus SC^VOLA, Gemmellaro. 1878. 



Sinistral, thick, more or less conic, turriculated or conic-de- 

 pivssed, umbilicated, spire sharp, longitudinally variciformly pli- 

 cate, crossed by spiral riblets; aperture circular. Liassic, Sicily. 

 S. i XTERMEDIA, Geinmellaro. 



Genus CRASPEDOSTOMA, Lindstrom. 1884. 



Naticiform, with longitudinal laminse ; aperture circular, with a 

 widely expanded thick peristome, which is aliformly produced to 

 tlu- left at the base; umbilicus narrow. Silurian of Gotland. C. 

 ELEGANTULUM, Lindstroni (PI. 1, fig. 18). 



? Genus CROSSOSTOMA, Morris and Lycett. 1854. 



I in perforate, thick, turbinated, apex obtuse; aperture contracted 

 circular, entire, sharp edged, with a reflected peristome some dis- 

 tance behind it ; umbilical region with a dentiform callosity, 

 formed by a funiculum which fills the umbilicus. 



Jurassic. C. REFLEXILABRUM, d'Orb. (PI. 1, figs. 19, 20). 

 2 



