201 



(360). Euehelus seabriuseulus, Fm-htr. 



Trochus scahrin.'^culus, Fischer, Coq. A^iv., p. 374:, t. 114, f. 2, 

 1880 : Euehelus (Herpetopoma) seabriuseulus, Pilsbry, Tryon's 

 Man. Conch., voL XI., p. 445, t. 38, f. 12, 1889; Euehelus Tas- 

 manieus, Ten. -Woods, Proc. Roy. Soc. Tasm. for 187o, p. 152 

 (1876). 



There can be no doubt that the shell which is known to the 

 conchologists of N.S. Wales as E. scahriaseulus is identical with 

 E. Tasmanicus. Though I must admit that the figure of it given 

 by Pilsbry, Avhether original or copied from Fischer is not stated, 

 is not much like Woods' shell, which approaches more to the 

 figure of E. FischerL E. Tasmanieus has the multispiral 

 operculum attributed by Pilsbry to E. seabriuseulus, which 

 uniquely represents his section Herpetopoina. 



The question arises as to priority of name. The description 

 given by Tenison- Woods lacks that minuteness which is essential 

 to specific definition ; Fischer's diagnosis is much more detailed, 

 and though certain good characters are omitted, yet is worthy of 

 acceptance. The first employment of the species-name, seabrius- 

 eulus, is traceable to Angas in his list of N.S. Wales Marine 

 MoUusca, P.Z.S., 1867, p. 215, where it is alluded to as a M.S.- 

 name in Coll. Cuming by H. Adams and Angas, with the remark, 

 '' a very small species differing from E. baeeatus in its cancellated 

 sculpture and being umbilicated ; length, 2 lines." These com- 

 parative characters are sufficient had we the two species only 

 before us, but they are inadequate to locate the species among 

 congeners. However, I think the best interests of conchology 

 will be served by employing Angas' name, though perhaps a rigid 

 application of the law of priority would require the substitution 

 of Tenison- Woods' name. 



Based upon four Tasmanian examples, I have drawn the 

 following brief description : — The colour is ashen-reddish beneath 

 a thin epidermis (I fail to recognise the red spots disposed in 

 oblique lines mentioned by Ten. -Woods). There are four cinguli 

 on the penultimate whorl, in one example a small cingulus 

 between the third and fourth, which are larger than the other 

 two ; the last w^horl has eight cinguli between the beaded 

 umbilical border and the suture. 



The S. Australian examples which I refer to, E. seabriuseulus, 

 have never less than five cinguli on the penultimate whorl, 

 sometimes all equal, in others the medial one slender ; on the last 

 whorl the cinguli vary from ten to thirteen, more frequently 

 twelve. The colour is bluish-grey to reddish-brown, whilst the 

 beaded umbilical margin is conspicuously white. 



(361) Euehelus vix-umbilicatus, Tate (ante p. 196). 



(362) Euehelus pumilio, Tate (ante p. 196). 



