ijotiid.e. 17 



Family LIOTIID^. 



Head proboscidiform, epipodial line with a pair of conical lobes 

 and three pairs of cirri. Dentition ? 



Shell turbiniforni or discoidal, white, with longitudinal ribs or 

 clathrate ; aperture feebly nacreous, peristome continuous, thick, 

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

 with a calcareous layer formed of pearly particles spirally disposed. 



Genus LIOTIA, Gray. 1842. 



Characters 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. radiata, Kiener. 



Subgenus Liotina, INIunier-Chalmas. 1877. 



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

 spiral funieulum, aperture not nacreous, j^eristome varicose, re- 

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

 tative ; otherwise the group is Eocene. 



? Subgenus SciEVOLA, Gemmellaro. 1878. 



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

 pressed, umbilicated, spire sharp, longitudinally variciformly pli- 

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

 S. INTERMEDIA, Gemmellaro. 



Genus CRASPEDOSTOMA, Lindstrom. 1884. ' 



Naticiform, with longitudinal laminae ; aperture circular, with a 

 widely expanded thick peristome, which is aliformly produced to 

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

 ELEGANTULUM, Lindstrom (PL 1, fig. 18). 



? Genus CROSSOSTOMA, Morris and Lycett. 1854. 



Imperforate, thick, turbinated, apex obtuse ; ai)erture contracted 

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

 tance behind it ; umbilical region with a dentiform callosity, 

 formed by a funieulum which fills the umbilicus. 



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



