238 ELLOBIINiE. 



Sheepmakeri, Petit. subula, Quoy and Gaim . 



simplex, H. and A. Adams. tornatelliforrne, Petit. 



staguale, D'Orb. turritum, Pjeiff. 

 striatum, Phil. 



Genus CASSIDULA, Ferussac. 



Mantle-margin reflexed on the inner edge of the outer 

 lip; foot bifid posteriorly. 



Shell oval, sub-conic, solid ; spire short, obtuse ; aperture 

 narrow, longitudinal ; inner lip plicate anteriorly and re- 

 flected ; outer lip reflexed, with an internal, marginal callus 

 or ledge sinuated posteriorly. 



Syn. Ehodostoma, Swains, Sidula, Gray. Detracia, 

 Gray. 



Ex. C. coffea, Chemnitz, pi. 82, fig. 2. Shell, 0. coffea, 

 fig. 2, a. 



The Cassidulce are usually found in Maogrove-swamps, 

 and among loose stones near the sea-shore ; some species 

 are even seen inhabiting the water in the neighbourhood of 

 salt-marshes, and at high tide may be noticed crawling on 

 the sands in nearly two fathoms water. The group is 

 entirely tropical in its geographical distribution, being most 

 numerously represented in Australia and the Philippine 

 Archipelago, while a few species only are found in Southern 

 Africa. 



Species of Cassidula. 



anguilifera, Petit. faba, Mke. 



auris-felis, Brug. Gruneri, Pjeiff. 



coffea, CJi em. Kraussii, Kiist. 



Bensoni, Pfeiff. mustelina, Desk. 



Cumingiana, Reclu?. nucleus, Mart. 



doliolum, Petit. rugata, Mke. 



