TURRITELLA 



Species 39. (TMus. Cuming.) 



TuRRiTELi,.\ COCHLEA. Turr. iesia sululato-tnrritd, cras- 

 umcitld, cmfractihus quindecim,, spiraliter striaths, 

 mperne depresso-excavatis, medio bicarirmtis, caritm an- 

 gusiis, elevalis, aculis, distmdihus, mterstitio excavato, 

 aperiurd parvd ; albidd. 



The screw Turkitella. Shell subulately turreted, 

 rather thick, whorls fifteen in number, spirally 

 striated, depressly excavated round the upper part, 

 two-keeled in the middle, keels narrow, elevated, 

 sharp, distant, with the interstices between them ex- 

 cavated, aperture small ; white. 



Ilab. ? 



The form of this species is remarkably characterized by 

 its very prominent bicarinate structure, resembling the 

 thread of a large flattened press-screw. The specimen 

 here represented from Mr. Cuming's collection is the only 

 one I have seen ; and he possesses no information as to its 

 locality. It exhibits no indication of colour. 



Species 30. (Mus. Cumiug.) 



TuRRiTELLA RADULA. Turr. testd lanceolato-acuminatd, 

 gracili, anfractibiis ad diwbus et viginli, supra, infrdque 

 biUraUs, medio concavLs, liris, nisi hifimd, granoso-cre- 

 nalis, aiifractu ultimo lamellis septiformibus itilerdum 

 itiibricato, gramiUs subobsoletis ; violascente-albidd, 

 riifo-fuscescenteflammald et variegatd. 

 The grater Tureitella. Shell lanceolately acuminated, 

 slender, whorls about two and twenty in number, 

 double-ridged above and below, concave in the 

 middle, ridges, excepting the lowest, granosely cre- 

 nated, last whorl sometimes imbricated with septiform 

 lamellae, granules rather obsolete; violet-white, flamed 

 and variegated with reddish-brown. 

 Kienek, Icon. coq. viv. p. 13. pi. 3. f. 1. 

 Hab. Isle of Muerte, Bay of Guayaquil (found at the depth 

 of eleven fathoms in sandy mud) ; Cimiing. 

 The form of the whorls of this elongated lanceolate 

 species is very similar to that of T. exoleta ; the middle is 

 however less concave and the upper and lower ribs are re- 

 presented each by two smaller ridges which are granosely 

 crenulated. 



Species 31. (Mus. Metcalfe.) 



Turritella hastula. Turr. testd acute lanceolatd, 

 gracili, aiifractibus ditobus vel tribus et vigiitti, coii- 

 vexiuscidis, concentrice plicato-corrugatis, ulterioribus 

 planatis, basi tumidimculis, riigis evanidis, anfractibun 

 omnibus spiraliter inciso-striatis, liris intermediis ob- 

 solete granulatis ; cinereo-albicante, purpureo-bnmneu 

 arcuntim strigntd et variegatd. 



The little lance Turritella. Shell sharply lan- 

 ceolate, slender, whorls two or three and twenty in 

 number, rather convex, concentrically plicately 

 wrinkled, the latter flattened, rather swollen at the 

 base, the wrinkles faded away, all the whorls spirally 

 impressly striated, the intermediate ridges being 

 obsoletely granulated; ash-white, arcuately streaked 

 and variegated with purple-brown. 



Hab. ? 



A very slender sharply lanceolate shell, fully distinguished 



by the peculiarities of sculpture above described from any 



other species of tliis monograph. 



Species 33. (Mus. Cuming.) 



Turritella ferruginea. Turr. teMd snbelongaio-tur- 

 ritd, ad basin angulatd et subearinatd, aiifractibus w- 

 decim, convexis, spiraliter subtiliter liratis, priiuis biai- 

 rinatis, carinis gradatim evanidis, lirariim interstiliix 

 striis miuutis longituditialibus sub lente creberrime de- 

 cussatis; albidd, basin versus ferrugiiieo-castaneo tiiictii. 



The rusty Turritella. Shell somewhat elougately 

 turreted, angulated and slightly keeled at the base, 

 whorls sixteen in nimiber, convex, spii-aUy finely 

 ridged, the first whorls two-keeled, keels gradually 

 fading, interstices between the ridges very closely 

 decussated beneath the lens with minute longitudinal 

 striaj ; whitisli, stained towards the base with rusty 

 chestnut. 



IM. P 



The whorls of this species have a peculiar angular 



cariuatc structm-e at the base, in the place of the sutiire. 



Species 33. (Mus. Belcher.) 

 Turritella maculata. Turr. testd acuminato-turritd, basi 

 coHcavd et nitide striata, anfractibus ododecim .yjiru- 

 18iy. 



