356 



THETIS SCIENTIFIC RESULTS. 



EPIGRUS ISCHNUS, Tale, sp. 



Eissoina cylindracea, Ten. Woods, Proc. Linn. Soc. N.S. Wales, 

 ii., 1S78, p. 266 [not Rissoa cylindracea, Ki-ynicki, Bull. 

 Soc. Imp. Nat. Moscovi, ii., 1837, p. 60]. 



Rissoa ischna, Tate (nom. mut.), Trans. Roy. Soc. S.A., xxiii., 

 1899, p. 233. 



(Fig. 78.) 



Station 49. 



This species has not yet been figured, a drawing of the 

 author's type of Rit>soina cylindracea, Ten. 

 Woods, preserved in the Australian Museum, 

 is therefore here inserted. £. ischnus and 

 E. dissimilis are much alike in shape. Knowing 

 the latter only by the figure, and thinking that 

 the extra whorl of the former accounted for the 

 difference in size, I suggested to Prof. Tate that 

 the two names stood for different growth stages 

 of the same shell. Misled by me, he adopted 

 this view.* Mr. H. L. Kesteven has, how- 

 ever, recently taken and identified E. dis- 

 similis, which, set beside half grown E. ischnus, 

 proves perfectly distinct. To make this matter 

 clear, I have sketched E. dissimilis (fig. 80) 

 and E. verconis (fig. 79) to the same scale as 

 E. ischnus, drawn above. 



'^' ' ■ I have not been able to compare Eidima 



tasmanica, T. W. f with this species, to which 

 it is said to be related, if not identical. 



One half grown shell from 63-75 fathoms 

 off Port Kembla. 



EPIGRUS VERCONIS, Tate, sp. 



Rissoa badia, Petterd,Journ. Conch., i v., 1884, 

 p. 1 38 [not AJvania badia, A. Adams, 

 Ann. Mag. Nat. Hist, viii., 1861, p. 300]. Fig. 79. Fig, 



Rissoa verconis, Tate, Trans. Roy. Soc. S.A., xxiii., 1899, p. 233. 

 Id., Tate &, Mav, Proc. Lin)i. Soc. N.S. Wales, xxvii., 1901, 

 p 392, pi. xxvii!', f. 86. 



Station 49. 



One specimen from 63-75 fathoms off Port Kembla. 



* Ten. Woods.— Proc. Roy. Soc. Tas., 1875 (1876), p. 29. 

 t Tate— Proc. Linn. Soc. N.S. Wales, 1001, xxvii., p. 459. 



