124 THE PROCEEDINGS OF THE LINNEIN SOCIETY 



neck, and a large lobe on the right side; covering the hind part 

 of the shell ; foot truncate posteriorly ; shell rotund atelj oval, 

 heliciform, thin, fragile, covered with a thin epidermis ; spire 

 short, aperture large, peritreme simple, acute, straight. The 

 species of this genus have an extensive fold of the mantle 

 developed on the right side. Their foot is truncate, and their 

 shells are very thin." Vol. 2, p. 226. The general resemblance 

 of this shell in color, &c., to those which are clearly of the genus 

 Helicarioriy induces me thus to classify it : — 



Helicarion fumosa, n. s., PI. 12, fig. 3, 3a. 



H. t. umbiUcataj turhinato-discoiclea, tenuiuscula, politissima, 

 hneis incrementi rugulosa, intense fumoso-cornea vel subnigra, unico- 

 lor (apice excluso,) trnnslucente ; spira parimi exserta, apice pro- 

 minulo, sutura subtillisime corrugata ; anfr. 3 5-, rapide accrescentib. 

 Ewbryonalesl^, albidi, ultimo valde declivo-rotundato, basi rotundata; 

 apertura quasi orbiculata. Feristortia corneum, simplex, obtusum, 

 incurvatum, marginibus ab umbilico usque ad | ultimi anfractus 

 disjunctis : Columella acuta, declivis. Umbilicus angustissimus, 

 profundus. 



Viam. maj. 22, min 14, alt 18, millim. 



Obs. Sp. eleganter j^olita, et intense subnigra saturata, forma 

 vero, colo)e et aspectu H. atramentari^, Pfr. Dandenong Ranges, 

 Victoria- incolanti, valde proxima. 



Shell umbilicate, turbinately discoid, rather thin, highly polished, 

 uneven from the lines of growth, intensely smoky horn color or 

 nearly black throughout except at the apex, translucent, spire 

 somewhat exsert, with the apex very slightly prominent, suture 

 very finely corrugated; whorls 3 J increasing rapidly; embryonal 1 J, 

 whitish, last whorl largely rounded and sloping, aperture almost 

 orbicular. Peristome horny, obtuse, incurved, margins disjoined 

 from the umbilicus for about -}^ of the last whorl. Columella 

 acute, sloping, umbilicus very narrow and deep. 



This' species is'| elegantly polished, and of an intense dark 

 smoky brown, but in its shape, color, and general habit it is very 

 close'to H. atramentaria, Pfr. but that it is much smaller. There 

 is a peculiar in-turning of the horny margin, which makes it 

 rounded and blunt. 



