221 



This very singular, wasp-like shell is allied to C. insignis, PhUippii, 

 Cochinchinensis, &c, but distinguished from all by its peculiar form. 



Cyclostoma pollex. T. polliciformis, distorta, subumbilicata, 

 rufescens ; anfr. 6, ultimo ventraliter planulato, dorsaliter gibboso ; 

 anfract. posticis nonconformibus, rotundatis, dextrorsum nutantibus : 

 sutura profunda, marginata : apertura circularis, postice truncata ; 

 peritremate dupliei, modice* reflexo. Long. 1^ ; lat. f poll. Tavoy, 

 British Burmah. Rev. Francis Mason. 



This singular shell may possibly be Cyclostoma chrysalis, Pfr., but 

 is larger, destitute of lines and indentations. That shell is said to 

 come from Arva, (probably Ava.) Megalomasloma Myersii, Haines, 

 is another species of the same type, but less distorted and more cylin- 

 drical. 



These shells, coming from the same region, to which many others 

 will doubtless hereafter be added, I regard as constituting a natural 

 group, probably generic, for which I would propose the name Polli- 

 caria. Shell subperforate, chrysalidiform, ventrally flattened, spire 

 leaning ; aperture subcircular, truncate posteriorly within the peri- 

 treme. 



Cyclostoma cucullata. T. umbilicata, depresso-conica, soli- 

 dula, lineis incrementi et lineis volventibus tenuibus superne insculpta, 

 straminea ferrugineo tessellatim marmorata, et infra lineata, apice 

 nigro; anfr. 5 rotundatis; sutura profunda: apertura (genuina) 

 elliptica; peritremate reflexo, et cucullo lato unicolori oblique 

 truncato valde protracto ; fauce flava. 



Diameter, exclusive of false lip, ^ in. ; projection hood-lip, 1 inch ; 

 axis, | inch. From an island in the Mergui Archipelago ; Rev. 

 Judson Benjamin. 



With the exception of the aperture, the shell is much like small 

 specimens of C. linguiferum, or still more like C. irroratwn, Sowb. 

 Its remarkable hood is sufficiently characteristic. 



Mitra [Scaphella] Florida. T. ovato-fusiformis, solidula, albida 

 ferrugineo nubeculata et lineis numerosis fuscis interruptis interdum 

 albo articulatis cincta, quoad rostrum plicata et oblique lirata ; an- 

 fractibus 7 -f- ultimo spiram ter excedente, antic e angustato : aper- 

 tura angusta, postice acuta ; labro acuto : columella sexplicata, plica 

 postrema proximam bis superante ; intus alba. 



Axis, If ; greatest diam. f ; length of aperture, 1\ inch. Received 

 from Dr. Edmund Ravenel, of Charleston, as from Florida. Another 

 specimen, in the possession of Dr. Jay, was supposed to have come 

 from the Philippine Islands. 



Its characters are intermediate between Mitra and Voluta. It 

 most resembles in form and coloring a small Vol. antiquata, but the 

 markings are much more crowded and delicate. 



