TURRITELLA. 



Plate III. 



Species 8. (Mus. Cuming.) 

 TuRRiTELLA TiGRiNA. Tun. testd pyramidaU-turntd, 

 subangustd, solidiuscidd, anfractibus octodecim ad vi- 

 i/ittti, spiraUter guinqice- vel sex-liratis, costd tumidd 

 declivi ad basin aiigulatis ; albidd, flammk obliquk 

 purpiireo-nigris profuse pidd. 

 The tiger-striped Turritella. Shell pyramidally 

 turreted, somewhat narrow, rather solid, whorls 

 eighteen to twenty in number, spirally five- or six- 

 ridged, angled at the base with a slanting swollen 

 rib ; whitish, profusely painted with oblique purple- 

 black flames. 

 KiENER, Icon. coq. viv., p. 29. pi. -i. f. 2. 

 Hab. GuK of California. 



The peculiarities of this species, which approaches the 

 T. Imtiginosa and goniostoma, consist in its more solid 

 stnicture and narrow pyramidal gi-owth, whilst the whorls 

 are swollen to an obtuse angle round the base. The 

 colouring is disposed in more definite stripes, especially 

 towards the apex. In the species just mentioned the 

 first few whorls are conspicuously keeled round the middle, 

 but in the T. tigrina there is Uttle variation from the 

 general pattern. 



Species y. (Mus. Cuming.) 



TuRRiTELi.A lentiginosa. Turr. testd subobeso-turritd, 

 anfractibus ad vigiiiti, primis perpaucis carinatis, me- 

 diants planidatis, cceteris medio convexis, basi tunii- 

 dis, omnibus creberrime spiraUter siriatis et sidcatis, 

 apertiiram versus laminis irregularibiis imbricath ; 

 albidd, Uneis subtUibns fuscis, brevibits, interruptis, 

 spiraUter lentiginosa, maculis strigi-sve nigricantihns 

 subindistinctis oblique nehulatd, apice interdum vio- 

 laceo. 



The freckled Turritella. Shell rather stoutly tur- 

 reted. whorls about twenty in number, the first few 

 carinated, the middle whorls rather flattened, the 

 rest convex in the middle and swollen round the 

 base, the whole very finely spirally grooved and 

 striated, and imbricated with irregular lamiua3 to- 

 wai-ds the aperture; whitish, spirally freckled with 

 short interrupted fine brown lines, and obliquely 

 clouded with rather indistinct blackish streaks and 

 blot<-lie3, apex sometimes tinged with violet. 



Hab. Payta, Peru (in coarse sand at a depth of about five 

 fathoms) ; Cuming. 



A shell of rather stout growth, generally more or less 

 imbricated with rude irregular laminae near the outer lip. 

 The first seven or eight whorls are distinctly keeled round 

 the middle, the next seven or eight are flattened in a 

 manner almost to obliterate the suture, and the remainder 

 are sunk in the middle and swollen above and below, 

 showing the sutures more distinctly. 



The painting of this species consists of a profusion of 

 extremely fine, short, brown, transverse lines or dashes, 

 over which is an obscure confused marbling of oblique 

 blackish blotches ; in some specimens this is wanting 

 and its place is supplied by a dull greyish tinting. The 

 apex is frequently of a delicate violet colour. Care 

 should be taken not to confound the T. lentiginosa with 

 the following species which is characterized by a different 

 style of painting and a slight diS'erence of form. 



Species 10. (Fig. a and b, Mus. Cuming.) 



Turritella goniostoma. Turr. testd subcylindraceo- 

 acmninatd, anfractibus octodecim ad viginti, spiraUter 

 tennistriatis, primis perpaucis carinatis, niedianis 

 planulatis, cceteris medio concavis, costd interdum 

 prominuld et crenatd, supra et infra angulatis, an- 

 fractu ultimo sape prope aperturam laminis subimiri- 

 catis ; alba, griseo- vel rufescente-nigro dense mar- 

 moratd. 



The angulak-mouth Turritella. Shell somewhat cy- 

 lindrically acuminated, whorls eighteen to twenty in 

 number, spirally finely striated, the first very few 

 whorls keeled, the middle whorls smooth, the rest 

 concave in the middle, angled above and below with 

 a rib, which is sometimes prominent and crenated, 

 last whorl often slightly imbricated near the aperture 

 with lamina! ; white, thickly marbled with grey or 

 reddish-black. 



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

 p.275. 



Had. Payta, Peru; Salango, West Coluuihia; Guaeomayo, 

 Central America (in sandy mud at depths of from 

 five to ten fathoms); Cuming. 

 The \ariation of sculpture in the several stages of tin- 



growth of this species is very similar to that of the pre- 



Mav, 1841: 



