AD AMSIELL A. 



Plate I. 



Genus ADAMSIELLA, Pfelfer. 



Testa MoiKjo-turrila vel pupreformis, plerumque winute 

 reticulata, ad sutaras raro cremdata, aiifractii ultimo 

 Sffpe plus minus soliilo ; n perturd parviusculd, lahro 

 plerumque calloso-Jhahrmtu. Operculum circulare, 

 teuue, suhcartila/jiueum, aiifractibus panels, sensim 

 cresceuliljus, maryiue subllhero, nucleo suhceulraU. 



Shell obloiiii'-turreted or pupa-shaped, generally miiuitely 

 reticulated, rarely crenulated at the sutures, last 

 whorl often more or less uncoiled ; aperture rather 

 small, lip generally callously fimbriated. Operculum 

 circular, thin, somewhat cartilaginous, whorls few, 

 increasing gradually, with the edge somewhat free, 

 nucleus nearly central. 



In this genus of Cyclostomacea, named in honour of tho 

 late Professor C. B. Adams, the operculum is circular, 

 formed of a few gradually increasing whorls, slightly free at 

 the edge, with the nucleus nearly central. The species, of 

 which there are scarcely more than a dozen well defined, 

 are composed of rather narrow whorls, the last being 

 generally more or less uncoiled. The sculpture is minute, 

 delicately thread-like, including in some instances a few 

 creuulatious in the sutures. The aperture is small and 

 subtubular, mostly encircled with a flatly expanded cal- 

 lous frill. All the species, excepting one from Cuba, are 

 from Jamaica, one ranging into Denierara. A shell, un- 

 known to me, it shoukl however be added, was described 

 in 1861 (Pro. Zool. Soc. p. 233) by the Rev. H. B. Tris- 

 tram, under the name A. Osherti, collected by Mr. Salvin 

 in Guatemala. 



Species 1. (Mus. Cuming.) 



Ad.imsiella IGNILABRIS. Adams, testa angustli pro- 

 fundi umhilicald, turritd, fused, lahro vimde miniato ; 



anfractibus rotundatis, striis elevalis undique dense 



anuulatis ; labro duplici, calloso-reflexo. 

 The fiee-lip Adamsiella. Shell narrowly deeply um- 



biiicated, turreted, fuscous, lip bright scarlet-red ; 



whorls rounded, closely ringed throughout with raised 



striae ; lip duplex, callously reflected. 

 Cijclostoma ignilahre, Adams, Contr. to Couch. No. 1. p. 9. 



Adamsiella ignilahris, Pfeiil'er. 



Cyclostoma chlorostoma, Sowerby. 



Choaaopoma chlorostoma, Gray. 



Adamsiella chlorostoma, Pfeiffer. 

 Hah. Jamaica. Demerara. 



A closely ring-striated species, in wliicli the fiery-red 

 colouring of the lip contrasts in a striking manner with 

 the dull browu of the shell. 



Pig. 2. (Mus. Cuming.) 



This shell, which is Mr. Sowerby 's Cijclostoma articu- 

 latum, proves to be a variety of Professor C. Adams's Cy- 

 clostoma variuhile {Adamsiella variahiUs, Pfeifi'er). 



Species .3. (Mus. Cuming.) 



Adamsiella Giiayana. Adams, testd suhanguste pro- 

 fundi umhilicatd, ovato-puprpformi, violaceo-fuscd, se- 

 riced, aufractibus rotandalis, striis elevalis undique 

 confertiin. deeussalis, lahro duplici, late calloso-expanso, 

 fulrescente. 



Gray's Adamsiella. Shell rather narrowly deeply um- 

 bdicated, ovately pupa-shaped, violet-brown, silky, 

 whorls rounded, closely decussated throughout with 

 raised stria% lip duplex, broatUy callously expanded, 

 yellowish. 



Cjclostoma Grayanum, Pfeift'er, Zeitsch. fiir Malac. 184(5. 

 Cyclostoma obscurntn. Gray (not of Draparnaud). 

 Ckoanopoma Grayanum, Pfeifi'er. 

 Adamsiella Grayanum, Pfeifi'er. 

 Cyclostoma concentricum, C. B. Adams. 

 Cyclostoma serriferum, C. B. Adams. 



Huh. Jamaica. 



Of a rather short pupa-like form, with the lip broadly 

 callously expanded. 



Species 4. (Mus. Cuming.) 



Adamsiella monstros.a.. Adams, testa suhaperte iiuihi- 

 licatd, ohhngo-turritd,fulvesceiite, semipellucidd, rufo- 

 fusco eximie maculatd et marmoratd, anfractibus an- 

 gustis, rotundatis, decussatim striatis, ultimo soluto ; 

 aperlurd minutd, lahro latissime calloso-reflexo. 



The monstrous Adamsiella. Shell rather openly um- 

 bilicated, oblong-turreted, yellowish, semitranspareut, 

 lightly spotted anil marbled with red-brown, whorls 



AprU, 18G3. 



