202 EOCENE MOLLUSCA. 



No. 132. Conus alatus, F. E. Edwards. Tab. XXV, fig. 1 a, b. 



C. testa sub -f usi for mi, utrinque conicd, concentrice sulcata, antice sub-productd, retro- 

 Hexd, emarginatd ; spird acuminata, in longitudine trientem totius testa superanti: anfrac- 

 tibus convexiusculis, sub-angulatis ; marginibus posticis angustis, concavis, concentrice 

 sulcatis ; sulcis concentricis irregularibus, postice evanescentibus : aperturd angustd ; labro 

 aliformi, fere semicirculari, acuto, intus incrassato, antice crenulato, postice perparum brevi- 

 tcrque emarginato ; labio antice reflexo, producto. 



Var. hemilissa. Testa breviori, iatiori, postice lavi ; marginibus anfractuum valde 

 cavatis, unico sulco concentrico exaratis. 



Shell nearly fusiform, doubly conical, concentrically furrowed, rather produced and 

 bent backwards at the base, and deeply notched ; the concentric furrows are irregular, 

 crowded, and sharp-edged over the base, more distant and obscure as they ascend the 

 shell ; the spire is pointed, elevated, rather more than a third part of the whole shell 

 in height, and terminates in a very small, conical pullus. The whorls are rather 

 convex, slightly angulated at the shoulder, and a little thickened on the edge round 

 the suture ; the posterior margin is narrow, rather concave, and traversed by two or 

 three deepish furrows. The aperture is narrow and nearly straight, with the anterior 

 extremity slightly curved outwards and backwards ; the outer lip is remarkably large, 

 almost semicircular, thickened within, thin and sharp on the edge, and separated from 

 the suture by a very small but rather deep curvature ; the inner lip produced, reflexed, 

 and curved backwards ; the columella presents a broad, elevated ridge or " crest " 

 in front. 



A variety occurs at Brockenhurst, in which the shell is shorter and wider ; the 

 posterior portion of the whorl is smooth ; the angle on the shoulder sharper and more 

 clearly defined, and the posterior margin more concave, and traversed by a single 

 obscure furrow. 



The presence, in this species, of concentric furrows instead of the sharp, elevated 

 lines which characterise C. dormitor, is not a character to which much specific value 

 can be attached, as these ornaments interchange by insensible degrees ; but the 

 depressed, concave posterior margin of the whorls, the very large wing-like, outer lip, 

 the small, narrow, but deep curvature which separates the outer lip from the suture, 

 and the deep anterior notch, with its usual accompaniment, the elevated crest on the 

 columella, appear to me to justify the separation of the present species. Even the 

 variety which, with its half-smooth half-sulcated surface, so much resembles the var. 

 seminuda of C. dormitor, is easily distinguishable by these characters. 



Size. — Type — Axis, 1 inch and 5-12ths, nearly; diameter, rather more than 

 6-12ths of an inch. Variety — Axis, 1 inch; diameter, ^ inch. 



Localities. — Type : Bramshaw. Variety : Brockenhurst, Lyndhurst. 



