258 Mr. W.H. Benson on Freshwater Shells 
sequently described by Lea as M. /ateritia), mistaken for M. 
Riquetii. 
Clea Annesleyi, B. 
Testa oblongo-ovata, solidiuscula, radiatim striata, striis sulcisque 
spiralibus obsoletis plus minusve decussata, epidermide olivacea, 
fasciis castaneis superne subtusque conspicuioribus ornata, non- 
nunquam omnino atro-castanea, induta; spira ovato-conica, apice 
obtusiusculo plerumque eroso, sutura impressa; anfractibus 4} 
convexiusculis, ultimo 3 testes eequante, prope suturam angulato, 
infra medium sulcis duobus obliquis, et basin versus crista com- 
pressiuscula cincto, basi profuude emarginata; apertura elliptico- 
ovata, intus (preecipue superne subtusque) fasciata, peristomate 
tenui, infra ad finem sulcorum undulato, columella superne sinuata, 
callosa, polita, livide lilacina, margine antice incrassato spiraliter 
torto, callo parietali crasso, plerumque atro-purpureo. Operculo 
unguiculato, parvo, corneo, nucleo marginali, dextrali, subbasali, 
rostro basali elevato munito. 
Long. 83, diam. 4} mill. 
Habitat in stagno prope Quilon. 
This interesting form was taken alive in a tank between 
the sea and the canal which communicates with Cochin to the 
north of Quilon. It was accompanied by Corbicula Quilonensis. 
The last whorl is occasionally of a blackish olive hue; and in 
this state the interior is tinged with purplish black. Soaked in 
warm water, the epidermis assumes a pustulose character, which 
disappears when the shell is dry. 
The species in question appears to enter into the genus Clea, 
H. & A. Adams, founded on shells from Borneo and Malacca, 
in the ‘ Zoological Proceedings’ for 1855, agreeing therewith in 
the construction of the columella and base of the shell, thongh 
belonging to a different sectional type of form. 
Lovell Reeve has, in the ‘ Conchologia Iconica,? merged Clea 
into Swainson’s Hemisinus, in which the base of the columella is 
simply sinuate, and of which the typical species inhabit tropical 
America. He gives no information regarding the operculum, 
which was scarcely likely to. be absent from all the specimens of 
Hemisinus which came under his inspection in Mr. Cuming’s 
collection. Whether it is spiral as in Melania, or unguiculate. 
as in Tanalia, is not stated; neither is any account given in 
the ‘ Zoological Proceedings’ of the construction of the opercu- 
lum in Clea. Figures and descriptions of Brazilian Hemisini, 
under the genus Melanopsis, appear in the Number of the 
‘Journal de Conchyliologie’ for July 1860; but no mention is 
made of the operculum, the examination of which is too fre- 
quently neglected. 
The aspect of the shells figured in the ‘ Conchologia Ieonica’” 
as Melanopsis Zelandica, Gould, and M. Strangei, Reeve, affords 
