TURRITELLA. 



Plate II. 



Species 5. (Mus. Cuming.) 



TuRRiTELLA LEUCOSTOMA. Turr. testd subpyratnidali- 

 acuminatd, angustd, acutissime lanceolatd, solidiusculd, 

 anfractibus ad viginti, mpenii contractk, suturis ex- 

 cavatis, infernl extrormm projedk, plamdatis, spi- 

 raliter sex-liratis, liris angnstis, suSdistantibus, ititer- 

 siitiis subtilissinie striatis ; fulvescente-albd, liris ni- 

 tide aurantio-rufo articulatis. 



The white-mouth Tdrritella. Shell somewhat pyra- 

 midally acuminated, narrow, very sharply lanceolate, 

 rather solid, whorls about twenty in number, con- 

 tracted round the upper part, sutures excavated, 

 projected outwardly round the lower part, flattened, 

 spirally six-ridged, ridges narrow, rather distant, 

 interstices veiy finely striated ; fulvous white, ridges 

 neatly articulated ndth orange-bro\vn. 



Valenciennes, Zool.Voy. Humboldt et Bonpland, vol.ii. 

 p. 275. 



Hab. Gidf of Nicoiyo (in sandy mud at the depth of eleven 

 fathoms) ; Cumiug. 



Distinguished by the truly regular style in which the 

 shell is tm-reted. The whorls contracted round the upper 

 part and projecting outwards gi-aduaUy towai-ds the base, 

 look like an attenuated pyramid of thimbles ; and they 

 are spirally encircled thi'oughout by a row of neatly arti- 

 culated ridges. 



Species 6. (Fig. a and b, Mus. Cuming.) 

 Turritella Broderipiana. Turr. tedd elotigato-furritd, 

 subcgliiidraceo-tiimidd, anfractibus octodecim, vudique 

 creberrime imprcxxo-strin/is, perpaneis primis unicari- 

 natis, mediiiiiis jiliiiiiiliili.% cateris medio depresso-con- 

 cavis, sulunx iiiU-nliiui iiiJistinctis ; fulvesceide, cartt- 

 leo-fuscescente nebiilatd, lineis riibido-fuscis transfoersis 

 brevibus iiiterruptis, in strigis undulatis frequenter dis- 

 posilis, dense lentiginosd. 

 Broderip's Turritella. Shell elongately turreted, 

 somewhat cylindrically swollen, whorls eighteen in 



number, very closely impressly striated throughoui, 

 the first few whoris one-keeled, the next flattened, 

 then depressly concave in the middle, sutures some- 

 times indistinct ; light fulvous colour, clouded with 

 blue-brown and thickly freckled with short inter- 

 rupted red-browii transverse lines, mostly disposed 

 in waved streaks. 

 D'Orbigny, Voy. dans I'Amc'r. Mend. Moll. p. 388. 



Turritella martnorata, Kiener. 

 Hab. Payta, Peru (in fine sand at a depth of about eight 

 fathoms) ; Cuming. 

 The T. Broderipiana has a very characteristic style of 

 painting, consisting of a profusion of short ii-regidar linear 

 dashes, ranged transversely, but mostly disposed in con- 

 fused longitudinally waved streaks ; and over these, there 

 is generally a scorched blue-brown stain of colouring. 

 The shell is of an uncouth subcylindrical growth, spirally 

 encii-cled throughout with fine grooved striae. 



Species 7. (Mus. Cuming.) 



Turritella bacillum. Turr. tesid elongato-acuminatd, 

 anfractibus octodecim ad viginti, convexis, superne sub- 

 plamdatis, spiraliter quinque- vel sex-carinatis, carhds 

 atigustis, subirregtdariter distantibus, aperturam versus 

 fere evauidis ; Vwido-fulvescente, carinis saturatioribus. 



The staff Turritella. Shell elongately acuminated, 

 whorls eighteen to twenty in number, convex, rather 

 flattened round the upper part, spkally five- to six- 

 keeled, keels narrow, somewhat iiTcgidarly distant, 

 almost disappearing towards the aperture ; livid ful- 

 vous colour, the keels being of darker hue. 



Kiener, Icon. coq. viv., p. .5. pi. 4. f 1. 



Hab. Ceylon. 



The spiral keels of this species are not developed in the 

 sharp prominent style of the T. terebra. Towai'ds the 

 aperture they nearly disappear, leaving their colour on 

 the surface as tliough they had sunk, so to speak, into 

 the substance of the shell. 



May, 1849. 



