145 



Scala zelebori, J^imkcr. 



Scalaria zelehori, Dnnker, Verhandl. Zool. Bot., Gesell., 

 Wien, 1866, vol. xvi., p. 912. Scalaria zelehori, Frauenfeld, 

 Reise, Fregatte Novara, vol. ii., pt. 3, p. 7, t. i., f. 6, 1868; 

 Tryon, Man. Conch., vol. ix., p. 78, pi. 15, f. 75, 1887; Hand- 

 list of Aq. Moll, of S. Anst., Adcock, 1893, No. 199. 



This is recorded for S. Aust. by Tate, from a single in- 

 dividual given to him by Mr. Pulleine, from Encounter Bay. 

 No other collector has taken it, nor has it been found in Tas- 

 mania or Victoria. Probably it does not occur here. 



Scala platypleura, spec. nov. PL iv., fig. 6. 



Shell moderately solid, whorls 8, increasing rapidly. 

 Protoconch two whorls, smooth, convex. Whorls well round- 

 ed. Suture deep, simple. Varices running forward below, 

 solid, rather low, doubly flanged so that a free edge projects 

 slightly on either side, edges minutely cut, surface slightly ir- 

 regular, subangular below^ the suture, 15 on the body-whorl. 

 Aperture roundly quadrate, with an oblique gutter at the 

 base of the columella. 



Sculpture. — Obsolete subdistant spiral incisions mount- 

 ing the varices. 



Length, 5 mm. ; spine, 2'6 mm. ; width, 2*3 mm. 



Hab. — Backstairs Passage 22 fathoms, 2 dead. Type in 

 Dr. Verco's collection. 



The second shell is rather thinner, and its varices are 

 not quite so solid. 



Diagnosis. — From ^S'. zelebori, Frnfd., its nearest ally, it is 

 distinguished by more numerous varices, and its incisions, 

 which are quite different from the more distant spiral lirae of 

 the N.Z. form. It differs from .S'. juhesianctt, Forbes, in the 

 more rapid increase of its whorls, its fewer and much more 

 solid varices^ which also run forward and downwards instead 

 of backward. 



Scala acanthopleura, spec. nov. PI. iv., fig. 8. 

 Shell rather solid, whorls 8, rapidly increasing. Proto- 

 conch conical, smooth, sharp, 3 whorls, homostrophe. Varices 

 solid, half the width of the interspaces, numerous, 20 on the 

 body-whorl, tuberculate, 4 tubercles or prickles on the penul- 

 timate, 7 on the body-whorl, microscopically axially striate. 

 Interstices very minutely closely spirally Urate, lirae mount- 

 ing the varices. Aperture round, with a shallow gutter at 

 the junction of the basal lip and the columella, which is thus 

 slightly twisted and toothed. The varices wind round the 

 columella as 7 oblique plaits ceasing at the inner lip, which 

 here is thin and erect. 



