TURRIT ELLA 



Species 42. (Mus. Brit.) 



TuRRiTELLA Tasmanica. Tuit. testd angiisto-acnmi- 

 uatd, soltdiusculd, anfractilus guindeeim,j]laini<sai/is, 

 ml niarginem iiifer'wrkm Uratis, litis diiabus strusqiie 

 intermedUs supra cingulatk, iiiterstitiis siriis minutis 

 elevatis obliquis creherrime decussatis ; sordide alba. 



The Tasmanian Tureitella. Shell narrowly acumi- 

 nated, rather solid, whorls fifteen in number, rather 

 flattened, ridged at the lower edge, encircled with 

 two ridges and intermediate strife above, interstices 

 very closely decussated with niinute oblique raised 

 strise ; dead white. 



Hub. Van Dieman's Land ; Dr. Sinclau-. 



The only specimen of this, in the British Museum, is in 

 bad condition and colourless, but aiTords strong characters 

 for the foundation of the species. It approximates nearest 

 to the T.clathratn in which the spiral ridges are more 

 strongly and conspicuously developed, and the interstices 

 smooth. 



Species 43. (Fig. a an&b, Mus. Cuming.) 



TURRITELLA TRIPLICATA. Tnrr. testa acimunaio-turrild, 

 crassiiisadd, tw/rar/i/ws qi<h,Jrn„i, sph-aVdn- sinatis. 

 ,'t tricoslntis, costis pliiiiidatis, n,r,l„nnl lunlh, i„„j,nr, 

 Sliperiori purvu, duphculd, iijiiri-m rr/s/i.s nihrJitM 

 obsoletd; nunc albidd, castanco curhyald d Jlnmmatd, 

 nunc castaned, unicolore. 



The three-plaited Turritella. Shell acuminately 

 turreted, rather thick, whorls fifteen in number, 

 spirally striated, and three-ribbed, ribs flattened, the 

 middle rib much the largest, the upper one small, 

 duplicate, ar.d sometimes obsolete towards the apex ; 

 whitish, variegated and flamed with chestnut, some- 

 times entirely chesttuit. 



Studer, Philippi, Enum. Moll. Sicil.p. 190. 



Hab. Mediterranean and West Coast of Africa. 



The specimens here figured of this species are from flic 

 mouth of the Gambia ; in the Mediterranean it is of some- 

 what smaller dimensions and of lighter growth. 



Species 44. (Mus. Brit.) 



Turritella nivea. Turr. testd elongato-turritd, crassi- 

 usculd, anfractibus mginti, sxiperne contractis, deinde 

 tnmidiusculis, transversim septem-costatis, costis inier- 

 stitiisque striaiis, aqualibus, striis nwmtis hicrementi 

 creberrime decussatis, anfractibus perpaucis primis 

 bicarinatis, carinis cito evanidis ; nivea. 



The snow-white Turritella. Shell elongately tur- 

 reted, rather thick, whorls twenty in number, con- 

 tracted round the upper part, then rather swollen, 

 transversely seven-ribbed, ribs and interstices striated, 

 equal, very closely decussated with minute lines of 

 increase, first few whorls two-keeled, keels quickly 

 disappearing ; snowy-white. 



Gray, MSS. British Museum. 



Hab. East Coast of Africa; Capt. Owen, R.N. 



A genuine snow-white species, rather closely encircled 



with neat ridges of equal width with the interstices. 



Species 45. (Mus. Brit.) 

 Turritella Gun nil Turr. testd elongato-acuminatd, soli- 

 diusculd, anyustd, anfractibus octodecim, plano-con- 

 cuvifi, uKii-ijiii'dlUx iuiiiidiiiscuhx. medio obscure et sttb- 

 in-iyiilar'ili'r linitix i-l si rial is, s/i/iir/^ excavatis; albidd, 

 JlauiMis uudi'.lati^ piilliili- J'nh-i sri'iite-fuseis oMiquii pictd, 

 basi pallide rosed. 

 Gunn's Turritella. Shell elongately acuminated, 

 rather sohd, narrow, whorls eighteen in number, 

 flatly concave, margins rather swollen, obscurely and 

 somewhat irregidarly ridged and striated in the middle, 

 sutures excavated ; whitish, obliquely painted with 

 light fulvous-brown waved flames, base pinkish. 

 Hab. Van Dieman's Land ; Gunn. 



An interesting new species collected by Mr. lionald 

 Gunn, an eminent naturalist of Hobart I'own. It is a 

 narrow, sharply acuminated shell, with the whorls flatly 

 concave, and margined at the edges so as to give an ex- 

 cavated appearance to the sutures. 



Species 4G. (Mus. Belcher.) 

 Turritella auuila. Turr. testa pyramidali-turritd, an- 

 fractibus qualuordecim out quindecim, supernt: concavo- 

 dec/icibus, deinde sububscuri: late bicostatis, undique con- 



Junc, 1849. 



