572 Mr. Cosmo Melvill on the 



Subgenus Plicatella (Swainson). 

 Spire moderate, whorls angular, concavely depressed 

 round the upper part. 



*3o sp. Latiriis. 6 sp. Plicatella, 



Genus Peristernia (Morch). 



Shell subturreted, not umbilicated ; whorls longitudinally 

 ribbed ; aperture oval, canal moderate and recurved ; outer 

 lip thin and crenulated ; columella with one or two slight 

 plaits anteriorly, 



21 sp. : — 



Genus Leucozonia (Gray). 



Shell oval, subglobose ; spire moderate ; aperture 

 oblong : canal short ; columella sub-flexuous, with small 

 oblique, unequal plaits ; outer lip subacute, with a tooth or 

 tubercle at the fore part. 



1 5 sp. (including Lagena^ Schum: in which the species are 

 smooth). 



Genus Fastigiella (Reeve). 



I sp. now removed to Cerithidce. 



The old genus Turbinella^ with Cynodonta (Schum) 

 Vasum (Bolt), being separated owing to the completely 

 different dentition, the lateral teeth possessing one single 

 large denticle only. 



As recently as 1865, Mr. Crosse (^Journ, Conch. XIII., p. 

 317, pi. 14, f. i) in describing one of the species, mentions, 

 "This shell has the general appearance of Latiriis (Montf), 

 but no umbilicus, consequently it shows that the separation 

 of Latirus from the other Turbinellidce is not natural." I 

 take it Mr. Crosse meant here, Leucozonia^ Peristernia^ and 

 Fasciolaria^ speaking of the order by its old name. 



About the same time Dr. Troschel, of Bonn, examined 

 and reported upon the radulae of these four genera (Gebiss 



* Many of these are mere synonyms. 



