I A N T H I N A 



Plate III. 



Species 1 1 . (Fig. II a and 1 1 b, Mus. Cuming.) 

 Ianthina kalti;ata. laiii/i. testa depi-esso-tuMnatd, 

 spird pnrcu, anfractibus decUvi-convexis, concentrice 

 plicato-cornigatis, spiraliter striatk ; supra violas- 

 cente-albd, infra ceeruled, fascia conspicud albd circa 

 columellam, coliimelld saturate violaced; aperturd 

 transversa, medio sinuatd. 

 The belted Ianthina. Shell depressly turbinated, spire 

 small, whorls slantingly convex, concentrically pli- 

 cately wrinkled, spirally striated ; violet-white above, 

 blue beneath, with a conspicuous white baud round 

 the columella, which is very dark violet ; aperture 

 transverse, sinuated in the middle. 

 Hai. Cape of Good Hope. 



This is certainly distinct from /. frayiUs, though re- 

 sembling it in general form. The surface is concentri- 

 cally plicately wrinkled, and the under surface is charac- 

 terized by a white band round the columella, which is 

 prominently dark-coloured. Its nearest ally is /. Smithirr, 

 represented at Fig. 15. 



12. (Fig. 12 a and 12 4, Mus. Cuming.) 

 Ianthina involuta. lanth. testd ovato-conicd, anfrnc- 

 tibus oblique subrude siriatis, convexis, ultimo versus 

 aperturam involuto ; supra molascente-albd, opacd, 

 infra etrridescente ; spiraliter sulcato-siriatd, striis bi- 

 nis, columelld brevi, aperturd suborbiculari, marline 

 contini/o. 

 The unrolled Ianthina. Shell ovately conical, whoris 

 obliquely somewhat rudely striated, convex, last whorl 

 unrolled towards the aperture ; above violet-white, 

 below bluish ; spirally groove-striated, stri;e in pairs, 

 columella short, aperture nearly orbicular, margin 

 continuous. 



ffab. ? 



The detached convolution of 'the last whorl of this spe- 

 cies is not a mere lusus. Mr. Cuming possesses several 

 specimens, all precisely agreeing in this and other specific 

 peculiarities. 



tricosd, anfractibns subrude decussaiim striatis, s«- 

 perne declivibus, deinde rotundatis, parum anyulatis ; 

 intense purpureo-violaced, prope apicem pallidiore ; 

 columelld rectd, margine teime rej/exd ei tortiwsd, 

 aperturd subijuadratd, medio late sinuatd. 

 The British Ianthina. Shell turbinated, somewhat 

 veutricosc, whorls rather roughly decussately stri- 

 j ated, sloping at the upper part, then rounded, but 



little angled; deep purple-violet, paler near the 

 apex ; columella straight, thinly reflected and twisted 

 at the edge, aperture somewhat square, broadly sinu- 

 ated in the middle. 

 Leach, MS. Jide Jeifrey in Forbes and Hanley's Brit. 



Moll. vol. iv. Appendix, p. 200. 

 Ianthina communis, Forbes and Hanley. 

 Hub. Perranzabuloe, Cornwall ; Cuming. 



The deep-coloured ventricosely turbinated species indi- 

 cated, according to Mr. Jeffrey, by Dr. Leach under the 

 above title, and of which the specimen here figured was 

 captured alive by Mr. Cuming off the coast of Perranza- 

 buloe, Cornwall, must not be confounded with /. commu- 

 nis of the Jlediterranean and Atlantic, or I.fragiUs of the 

 West Indies and Mazatlan. Both these species are more 

 ang\dated and less deeply coloured. 



Species 1.3. (Fig. 13 a and Vib, Mus. Cuming.) 

 Ianthina Brit.i.\N'ICA. lanth. tedd turhinaid, suhve 



Species 14. (Fig. 14 a and 14 b, Mus. Cuming.) 

 Ianthina depressa. lanth. testd depresso-turbinatd, 

 spird brevi, plamdatd, anfractibus declivi-convexis, 

 oblique pUcato-corrugatis, spiraliter conapicue sulcato- 

 striatis, striis irregularibus, subflexuasis ; supra vio- 

 lascente-albd, subopacd, infra semipellncido-violaced ; 

 columelld contorto-appressd, aperturd tramversd, vix 

 sinuatd. 

 The depressed Ianthina. Shell depressly turbinated, 

 spire short, flattened, whorls slopingly convex, ob- 

 liquely plicately wrinkled, spirally conspicuously 

 groove-striated, striae irregular, rather flexuous ; vio- 

 let-white, rather opaque, above semi-transparent, vio- 

 let beneath ; columella twistedly appressed, aperture 

 transverse, scarcely sinuated. 



fM. ? 



An elegant species, of convexly depressed form and pe- 

 culiar opaque- or chalk-white violet-tinged substance. 



December, 1858. 



