14 



Long. 1 ; lat. -^^ poll. Inhabits Tavoy. Eev. Francis Mason. 



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

 Philippii, Cochinchinensis^ &;c., but distinguished from all by its 

 peculiar form. 



I Cyclostoma pollex. T. polliciformis, distorta, suburabili- 

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

 gibboso ; anfract. posticis nonconformibus, rotundatis, dexti'orsum 

 nutantibus ; sutura profunda, marginata : apertura circularis, 

 postice truncata ; peritremate duplici, modice reflexo. 



Long li ; 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.) Megalomastoma My- 

 ersii, Haines, is another species of the same type, but less 

 distorted and more cylindrical. 



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 Pollicaria. Shell subperforate, chrysalidiform, ven- 

 trally flattened, spire secund ; apertui'e subcircular, truncate 

 posterioi'ly within the periti'eme. 



Cyclostoma cucullata. T. umbilicata, depresso-conica, 

 soliduhv, lineis incrementi et lineis volventibus tenuibus superne 

 insculpta, straminea ferrugineo tessellatim marmorata, et infra 

 lineata, apice nigro ; anfr. 5 rotundatis ; sutura profunda": aper- 

 tura (genuina) elliptica ; peritremate reflexo, et cucullo lato 

 unicolori oblique truncato vakle protracto ; fauce flava. 



Diameter, exclusive of false lip, y^g- inch ; projection of hood- 

 lip ;|^ inch ; axis ^ inch. From an island in the Mergui Archi- 

 pelago ; Rev. Judson Benjamin. 



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

 small specimens of C. linguiferum^ov still more like C. irroratum, 

 Sowb. Its remarkable hood is sufficiently characteristic. 



MiTRA FLORIDA. T. ovato-fusiformis, solidula, albida ferru- 

 gineo nubeculata et lineis numerosis fuscis interruptis interdum 

 albo articulatis cincta, quoad rostrum plicata et oblique lirata ; 

 anfractibus 7-|- ultimo spiram ter excedente, antice angustato: 



