126 RECORDS OF THE AUSTRALIAN MUSEUM. 



Separatista separatista, Dillwyn. 

 (Plate xvii., fig. 22). 

 Tnrlo separatista, Dillwyn, Cat. Recent Shells, ii , 1817, p. 867. 

 Trichotropis tricarinata, Brazier, Proc. Linn. See. N.S.W., i., 

 1877, p. 313. 



This species has a complicated synonymy. The first binomial 

 application is Turbo helicoides, Gmelin, 1790, which Watson dis- 

 allows," because repeated in the same work for another shell. 

 Since the T. helicoides, applied to S. separatista, has page prece- 

 dence over the other, this ruling is doubtful. I follow Pilsbry" in 

 selecting the specific name as of Dillwyn, 1817, long prior to the 

 name of Adams, used by Watson. The species has lately been 

 recorded from Torres Straits by Melvill and Standen,*^ who, per- 

 haps in correction, but probably in neglect of Watson's labours, 

 name it S. hlainvilleana, Petit. 



Brazier's specimen of 8. tricar ifiata, 5 mm. long, is here figured, 

 so that if the names assembled by Watson be dispersed, this 

 synonym may be rightly allotted. 



Separatista gracilenta, Brazier. 

 (Plate xvii., fig. 23). 

 Trichotropis gracilenta, Brazier, Proc. Linn. Soc. N.S.W., i., 1877, 

 p. 313. 

 The specimen drawn is 55 mm. long, and is from Darnley 

 Island. It is obvious that this, Trichotropis gabrieli, Pritchard 

 and Gatliff,-' and T. torcularis, T. Woods,^° are nearly related to 

 S. separatista. The superficial character of the untwisting of the 

 last whorl, valued as of generic importance, fail here. It will 

 therefore be necessary to abolish or to reform Separatista. 

 Taking the latter course T. gabrieli, T. gracilenta, and T. torcularis 

 may conveniently be distinguished from the typical northern 

 Trichotropis, and assembled under Separatista. 



Ataxocerithiu.m abbreviatum, Brazier. 

 (PI. xvii., fig. 24). 

 Cerithiuni abbreviatum, Brazier, Proc. Linn. Soc, N.S.W., i., 

 1877, p. 316. 

 The shell figured is 6 mm. long, and is from Katow, New 

 Guinea. 



The genus Ataxocerithium, to which I refer this species, was 

 indicated by Sowerby" and established by Tate.'- I suggest that 



6 Watson— Chall. Rep , Zool., xv., 1886, p. 428. 



7 Pilsbry-Cat. Mar. Moll. Japan, 1895, p. 59. 



8 Melvill and Standen— Journ. Linn. Soc, Zool., xxvii., 1899, p. 169. 



9 Pritchard and Gatliff— Proc. lioy. Soc. Vict., 1898, p. 183, pi xx., fig. 7. 



10 Hedley— liec. Aust. Mus., iv., 1901, p. 22, fig. 2. 



11 Sowerby— Conch. Icon., xv., 1865, Cerithiuni, sp. 146. 

 1-^ Tate— Proc. Koy. Soc. N.S.W., xxxii , 1894, p. 179. 



