IANTHINA. 555 



the attenuated front extremity of the latter are perhaps 

 the most striking distinctions. 



This species was first described as distinct by Mr. W. 

 Thompson, to whom it was communicated by Professor 

 Harvey, who found it at Miltown Malbay, in Clare, 

 where it had also been found by Mr. J. D. Humphreys, 

 whose specimen is now in the Jeffreysian cabinet. 



I. exigua, Lamarck. 



With longitudinal lamellar wrinkles ; spire rather elevated. 

 Plate LXIX. fig. 8, 9. 



hinthina exigtta, Lam. Anim. s. Vert. (ed. Desh.) vol. ix. p. 5. — Turton, Mag. 



Nat. H. vol. vii. p. 352. — Couch, Cornish Fauna, pt. 2, p. 



54. — Brit. Marine Conch, p. 151.— Brown, Illust. Conch. 



G. B. p. 24, pi. 8, f. 16, 17.— Sovverbv, Genera Shells, 



Ianth. f. 2, 3. — Swainson, Zool. Illust. ser. 1, pi. 85. — 



Lesson, Voyage Coquille, p. 368, Moll. pi. 8, f. 4. — Desh. 



Encycl. Meth. Vers, vol. ii. pt. 2, p. 325. — Reeve, Conch. 



Systemat. pi. 205, f. 2, 3. 

 lanthine cioktte, Blainv-. Man. Malacol. pi. 37, bis, f. 1 (not 1, a). 



„ naine, Quoy and Gaimard. Voy. Astrolabe, Moll. pi. 29, f. 5, 6, 7, 

 animal (probably). 

 Encycl. M£th. Vers, pi. 456, f. 2. 



The densely disposed irregular lamellar wrinkles, that 

 roughen the surface of this extremely fragile shell, render 

 it easily distinguishable from its described congeners. It 

 is of a somewhat conoidal subglobular shape, and is at- 

 tenuated both above and below ; the violet hue of its 

 colouring has somewhat of a reddish cast, and becomes 

 very pale, or almost white, upon the upper portion of the 

 body, and very faint, oftentimes, beneath the simple but 

 well defined suture of the superior volutions. Of the five 

 whorls, those of the spire arc rounded but sloping, are not 

 particularly narrow, are moderately raised, and of gradual 

 enlargement. The spire is rather elevated for the genus, 



