﻿C Y L I N D R E L L A. 



Genus CYLIXDRELLA, P/eiffer. 

 Trstit li-n-psfris, elangato-turrita, plenhnqite deictralis ; 

 (uifractibiis numerosis, apiralilnis, dechhns ; aper- 

 turd plerumqiie nvntd, margine coHfinuo. 

 Shell terrestrial, elongate-tnrreted, generally dextiiil ; 

 whorls numerous, apical, deciduous ; aperture 

 usually ovate, with continuous margin. 

 The CijUiidrdhv. are much more variable in form 

 than the Cldii^iiliw, and are without the internal 

 plate or rhiiixinm which distinguish that genus. 

 The first-formed whorls generally fall off when the 

 shell is advanced in growth. In many species the 

 aperture is brought round suddenly, so as to form a 

 sort, of crease (^rimn) with the coiled part of the 

 body-whorl. In others the last whorl is distorted or 

 uncoiled (solutm), so as to place the aperture at a 

 distance from the body of the shell. In a very few, 

 the margin of the aperture is interrupted by the ven- 

 tral bulge of the whorl. Considerably more than one- 

 third of the reported species are from the island of 

 Cuba, one-fifth from Jamaica ; another fifth would 

 be made up between Haiti and Mexico ; leaving very 

 few for a do;en other isolated localities, including 

 Great Britain, which produces four or five. 



Species 1. (Mus. Brit.) 

 Cylindrella aspera. Gyl. testa solidd, piipceformi, 



albiddvel rosed, striatd, versus apicein pyramidatd ; 



viediu et infra cylindricd; anfractibus sexdecenis, 



apicalibus inchisis, ■ultimo rimato ; aperturd 



sid)rotjindd, marrjine crasso, culiimelld inti'is 



plicatd. 

 The eough Ctlindrella. Shell solid, pupiform, 



whitish or rose, striated, pyramidal towards the 



apex, cylindrical in the middle and below ; 



whorls sixteen (including apical), last notched; 



aperture rather round, margin tliick, columella 



plaited within. 

 Adams. Pfeifier, Mon. III. p. .5<34. 

 Hub. Jamaica. 



Species 2. (Mus. Brit.) 



Cylindrella speciosa. Ci/1. testii Difupid, suUdiiiscidd, 

 ci/lindrico-subpyramidatd, obliipii striatd, vliraced. 



rcHlru-osd; anfractibus iH-n,i,inr„tihns uudec-nix, 

 piiiitii c(iim'.vis, ad siitimtm cn'tialix, (/iiiiiis iufcii. 

 oribiis siila-qualibiiS, ultiimt ,111,111!, du, c,',itni,l,,, 

 loiufe riiinilo, supra iiiirrturam arcuato ; aperturd 

 aurifiiniii, innryine superinri subjlexuoso, columelld 

 ri.v )ilic,itd. 

 The spkcious Cylindrella. Shell large, rather solid, 

 cj-lindrico - subpyramidal, obliquely striated, 

 olive, ventricose ; permanent whorls eleven, a 

 little convex, crenated at the suture, five lower 

 nearly equal, last angular, contracted, with a 

 long crease, arched above the aperture ; aperture 

 auriform, upper margin rather flexuous, colu- 

 mella hardly plaited. 

 DuNCER. Pfeifier, Mon. IV. p. (!ii.5. 

 H,a>. Columbia. 



This handsome species lo.ses its primary whorls far 

 down from the apex, so as to make a broadly-trun- 

 cated break. 



Species 3. (Mus. Brit.) 



Cylindrella splendida. Cyl. testa ventricosd, solidi- 

 nsculd, oblique eostatd, corneo-violaced ; anfracli- 

 liKs jjermanentibus octonis, iiit;l',iiiis iiiji,itis, 

 vltiiiw contraeto, longe rim,it,,, xn/ini iimrijinrin 

 npcrtune arcuato; aperturd luirifornii, ,;iliim,dhi 

 h'viter biplicatd. 



The splendid Cylindrella. Shell ventricose, rather 

 solid, obliquely ribbed, fleshy violet ; permanent 

 whorls eight, middle inflated, last contracted, 

 with a long notch, arched above the margin of 

 the aperture ; aperture auriform, c, lumella 

 slightly biplicated. 



Pfeiffer. Proc. Zool. Soc. 18(30, p. 139. 



Ilab. Mexico. 



Species 4. (Mus. Brit.) 

 Cylini'RELLA grandis. Cyl. festd magna, cylindricd, 

 latii, ten iiiihculd, tenuiter striatd, fusco-rubescenti, 

 sntiird aliido-marginatd; anfractibus permanenti- 

 hns ,Kt,juis, altis, quaternis inferioribus subceqtiali- 

 bus, idtihW cuntracto, aiigulato, profun.de rimato; 

 ,tpprtnrd magna, late subovatd; columelld rectius- 

 culd. 



