CYMBIOLA vespertilio. 

 Bat Volute. 



Family Volutidic. Sub-family Volutinae. Nob. 



Gkneuic Character. 



Shell armed with spinous tubercles, sometimes smooth but never 

 ribbed; spiral whorls gradually diminishing in size, but not 

 distorted ; the apix thick and obtuse; pillar with four plaits. 



Types of Form.— 1. Marmorata. Broderpia. Sw. (Cymbiola. Soiv.) 



2. Vespertilio. Nivosa. Rutila. Aulica. Pulchra. Pacifica. 



3. Elongata (?) Gracilis. Magnifica. Tuberculata. 4. ? 



5. Lujiubris. 



Specific Character. 



Shell armed icilli spinous tubercles, pale fulcoiis icitli remole an- 

 gular waved lines of brown ; spiral tchor/s plaited; pillar 

 ivitli four plaits. 



Voluta vespertilio. Lam. Sys. 7. 1. p. 336. 



The second or sub-typical genus of" the Volutes, appears to 

 be represented by this common thouj^h elegant species ; here 

 figured from one of the largest specimens we have ever seen. 

 The group is chiefly distinguished by the very obtuse but 

 regular termination of its spire, the whorls of which are 

 never distorted or disproportionately inflated : the plaits are 

 always four, and the pillar is never thickened in the middle : 

 the shells of all the typical species are furnished with pointed 

 tubercles ; and from their general aspect, do not a])pear to 

 be covered, like the typical Volutes, by the dilated mantle of 

 the animal, yet the two groups blend into each other by 

 means of tiie first type of form above indicated. 



As we have deemed it advisable to employ the name of 

 Cymbiola, (hitherto used in a spccijic sense), a« a generic 

 appellation for the whole group, we trust that those who may 

 adopt our views, will hereafter distinguish the Voluta cym- 

 biola of Sowerby, now in the cabinet of 3lr. IJroderip, by 

 the name of Cymbiola Broderpia, in just commemoration 

 of a gentleman whose knowledge of conchology, and wiiosy 

 general labours in the cause of science we have so often had 

 occasion to honour. 



83. 



