I A N T H I N A . 



Species 16. (Fig. 16 a and 16 A, Mus. Cuming.) 



Ianthina NlTENS. lantli. lestd siibglobosa, anfractihus 

 rotimdatiH, ad mturas impressis, oblique tenue striatis, 

 medio canaliculato-nmtatis ; ptirpnrascente-violaced, 

 nilenie; coliimelld njlexd, subcontorte prolongatd. 



The shining Ianthina. Shell somewhat globose, 

 whorls rounded, impressed at the sutures, obliquely 

 finely striated, canaiiculately sinualed in the middle ; 

 purple-tinged violet ; columella reflected, somewhat 

 twistedly prolonged. 



Menke, Syn. p. 1-11. Thilippi, Enum. Moll. p. 164. pi. 

 9. f. 15. 



Ianthina prolovyata, Payrnudoau. 



Hob. MediteiTanean. 



The shining surface of tliis species, after which character 



it is named, appears to be constant. 



Species 17. (Fig. 17 a and 17 4, Mus. Cuming.) 



Ianthina fibula, lanth. testa globoso-conica, anfracti- 

 hus dec/ivibas, spiraliter lineari-sidcatis ; supra vio- 

 lascente-albd, infra intense violaced, roseo pallidi 

 tinctd ; columella tenue reflexd, parum contort d. 



The button Ianthina. Shell globosely conical, whorls 

 sloping, spirally linearly grooved; above violet-white, 

 beneath deep violet, faintly tinged with rose ; colu- 

 mella thinly reflected, but little twisted. 



llab. ? 



Closely allied to I.fragilis, but its more globosely conic 



form and rosy colouring render it easily recognized. 



Species IS. (Fig. 1S« and 18 4, Mus. Cuming.) 

 Ianthina globosa. lanth. testa globosd, temii, inflatd, 

 spird brevi, subimmersd, anfractihus ad suturas im- 

 pressis, deinde rotundatis, undique subtililer decussa- 

 tim striatis; albidd, ad spiram basinque purpuras- 

 cente-violaced ; columelld tenue rejlexd, prolongatd; j 

 aperturd ampld, patuld, medio siihsinuatd, ad basin 

 canaliculatd. 

 The globose Ianthina. SheU globose, thin, inflated, [ 

 spire short, somewhat immersed, whorls impressed at 

 the sutures, then rounded, everywhere finely decus- 

 sately striated; whitish, purple-violet at the spire and 

 at the base; columella thinly reflected, prolonged; 

 aj)erture large, open, slightly siiiuated in the middle, 

 channelled at the base. 

 Swainson, Zoological Illustrations, First Series, vol. ii. 

 pi. 85. 



Ianthina prolongala, Blainville. 



Uab. ? 



This iiue species is chiefly characterized by the bold in- 

 flation of the last whorl, which almost rises into a collar at 

 the point of conjunction of its lip with the penuUiraate 

 whorl. 



Species 19. (Fig. 19a and 19 4, Mus. Cuming.) 

 Ianthina decollata. lanth. testa globosd, spird brevi, 

 subimmersd, anfractihus ad suturas impressis, deinde 

 rotundatis, undique siibtiliter decussatim striatis ; al- 

 bidd, ad spiram basinque pmpnraceo-violascente, colu- 

 melld tenue reflexd, superne appressd, deinde prolon- 

 gatd; aperturd subampld, medio mbsinuatd, ad basin 

 canaliculatd. 

 The decollated Ianthina. Shell globose, spire short, 

 somewhat immersed, whorls impressed at the su- 

 tures, then rounded, everywhere finely decussately 

 striated ; whitish, purple-violet at the spire and 

 base ; columella thinly reflected, appressed at the 

 upper part, then prolonged ; aperture rather large, 

 slightly sinuated in the middle, channelled at the base. 

 Carpenter, Cat. Reigen Coll. in Brit. Mus. p. 187. 

 Ilab. Mazatlan. 



Until better information is obtained on the habits of 

 the Ianthina, I forbear to disregard this species ; b>it my 

 conviction is that it will prove to be nothing more than a 

 variety of the preceding. There is no specific peculiarity 

 in the apparent decollation of the ape.\. 



Species 20. (Fig. 30 a and 20 4, Mus. Cuming.) 

 Ianthina pallida. lanth. testd globosd, spird parvd, 

 anfractihus ad suturas plano-imtner.'iis, deinde rotun- 

 datis, undique decussatim striatis; carulescente, ad 

 basin purpitreo-violaced ; columelld tenue reflexd; aper- 

 turd ampld, patuld. 

 The pale Ianthina. Shell globose, spire small, whorls 

 flatly immersed at the sutures, then rounded, every- 

 where decussately striated ; bluish, purple- violet at 

 the base; columella thinly reflected; aperture large, 

 open. 

 Harvey, Thompson, Brit. Marine Conch, p. 152. Forbes 

 and Hanley, Brit. Moll. vol. ii. p. 553. pi. 69. f. 10, 11. 

 Ianthina patula, Philippi. 



Hah. Miltown Malbay, County Clare, Ireland; Harvey. 

 Mediterranean; Philippi. Madeira^ M'Andrew. 

 Of uiiiroriiily smaller size than /. globosa and less in- 

 flated form. 



December, 1858. 



