125 



lines ; aperture narrow ; plaits, two prominent and two obsolete, 

 or much smaller than the others ; beak elongated." The author 

 then remarks: "To this subgenus belongs M. conquisita, Con., 

 and M. mississippiensis, Con., of the Vicksburg deposit," and 

 describes in detail a new species called " M. {Fusimitra) 

 weUingtoniV And these three are all the species mentioned by 

 Conrad on that occasion. Consequently we must take one of 

 them as the type of Fusimitra; M. cellulifera is not admissible 

 for that purpose. 



This interpretation puts a different aspect on Fimmitra as 

 usually understood ; and that term must be reserved for long 

 forms of MiTEiDiE like M. mellingtoni, closely allied to Mitra 

 (^sensu stricto). 



The shorter forms, contracted anteriorly and for the most part 

 longitudinally costated (formerly called Fusimitra), must receive 

 another name. Such forms bear considerable resemblance to 

 Costellaria, Swainson,* which, however, is typically not so much 

 contracted in front, being thus devoid of a beak-like pro- 

 longation. They approach still nearer to the genus JJromitra, 

 Bellardi, in which the Australian forms here described are 

 included. The protoconchs of typical species of Uromitra from 

 the Piedmont Basin are more pointed and elevated than those 

 of the Tertiaries of the Antipodes, otherwise the resemblance is 

 very close. 



Type. — Uromitra aiitegressa, Bellardi. 



Uromitra leptalea, Tate (sp). 



1889. Mitra {Costellaria) leptalea, Tate, Trans. Eoy. Soc. South Aust. 



pp. 135, 140, pi. V. fig. 3. 

 1893. Mitra leptalea, Tate and Dennant, id. vol. xvii. pt. 1, p. 220. 



Shell narrow, fusiform ; protoconch (Plate V. Figs. Za-h) com- 

 posed of two smooth turns, the earlier of which is much the smaller, 

 the later one being considerably inflated ; there is no sharp line 

 of demarcation between the protoconch and the shell in the 

 brephic stage, the smooth turn leading up to the shell proper, 

 gradually assuming the longitudinal costate sculpture which 



Malacology, 1840, p. 320. 



