152 FASCIOLARIID^. 



The papillary apex of the spire, the single plait on the 

 columella, and the long straight beak, are the chief charac- 

 teristics of this genus ; the animal is not yet known ; the 

 shell appears to have the greatest affinity to Busycon, 

 although usually regarded as a Murex. 



Species of Tvdicla. 



^OY\)hyYOStoma,, Adams and Beeve. spirillus, Linn. 

 nisticula, Bast. 



Genus latirus, Montfort. 



Shell turreted, fusiform, umbilicated ; spire produced, 

 whorls nodulous ; aperture oval-oblong ; outer lip thin, 

 crenulated ; columella straight, with two or three small 

 oblique plaits in front. 



Si/7i. Polygona, Schum. Polygonum, Blainv., not 

 Toiirnef. 



Ex. L. turritus, Gmelin, pi. 16, fig. 4. Operculum, 

 L. turritus, fig 4, a, 4, h. Shell, L. gibbulus, Gmelin, 

 fig. 4, c. 



The animals of all the species of this genus which have 

 been hitherto observed, are of a dull red colour ; the shells 

 resemble Fusi, but with the fore part of the pillar lip plicate. 



Sjjecies of Latirus. 



acuminatus, Kien. ceratus, Wood. 



afer, Lam. concentricus, Beeve. 



ananas, Chem. craticulatus, Linn. 



aiinulatus, Bolt. fastigium, Beeve. 



aplustris, Mart. filamentosus, Koch. 



atteiiuatus, Beeve. filosus, Schub. and Wag 



brevicaudatus, Beeve. ■ gibbulus, Gmel. 



castaneus, Gray. gracilis, Beeve. 



