MOLLUSCA, I. -SMITH. G5 



10. Jfixmin minim*!*. Smith. 



itdnrciixix, Smith, "Southern Cross" Mollusra, ji. I'd."), pi. XXIV, tig. 17 (l'.l(l-) : 

 "Discovery '' Gastropoda, ]i. S, pi. II, fig. 2; Melvill ;uid Staiiden, \'oy. ''Scotia," Zool., 

 vol. V, p. 102; Lamy, I'euxi^nie Exped. Antarct. Kram;., < last rnpodes, p. 10; Hedlev, 

 Brit. Antarct, Exped. 1907-9, Biol., vol. II, Mollusca, p. 5. 



Stations 220, 316, 331, 340: 45-250 fathoms. 



A synonym of Ifl.^mi is A/><ii///i<iii*ti, (Jistel (Naturgvseh. Tliierreiehs. IS4S. p. x.). 



11. Rissoia '//item//*. Smith. 



Itixxom ,/hii-iiilig, Smith, " Discovery " Gastropoda, p. '.), pi. II. lig. 1 (l'.Mi7): Hedley, Brit. 

 Antarct. Exped. 1907-9, Bio]., vol. II, Mollusca, p. 5. 



Stations 220, 31f>, 331, 340 : 45-250 fathoms. 



Twenty-three specimens, obtained at the above stations, show that the characters 

 pointed out in the original description, drawn up from only two examples, are quite. 

 constant. Their surface is not so glossy however, due probably to their having been 

 in spirit for some time. 



12. /iV.v.v,)/^ i/, /iil/i, Smith. 



Rissoia i/clida, Smith, "Discovery" Gastropoda, p. 9, pi. II, fig. 5 (1907); Hedley, Brit, 

 Antarct. Exped. 1907-9, Biol., vol. II, Mollusca, p. 5; Thiele, Deutsche Siidpolar-Exped., 

 vol. XIII, p. 195, pi. XI, figs. 37, 38. 



Stations 220, 316, 331 : 45-250 fathoms. 



This species is closely related to R. fr<inx<'ini<t, Watson,* from 140 fathoms, 

 between Marion Island and Prince Edward Island. It is, however, larger and more 

 coarsely spirally lirate. 



13. /iVxWf/ tli'iHtxxft, n. sp. PI. I, fig. 4. 



Shell imperforate, white, smooth, slightly glossy ; whorls 4j, convex ; the apex 

 large, obtuse, flatly arched at the top ; last whorl rounded at the periphery ; 

 aperture subcireular, obscurely pointed above; peristome continuous, the ends being 

 joined by a callus on the whorl, columellar margin thickened and reflexed. 



Length, 2 mm. ; diameter, 1 33. 



Stations 220, 316 : 45-250 fathoms. 



This species may be the 11. columna, Pelseneer,f but the spire appears to be 

 shorter, and the aperture rounder. 



14. llixKoiii ri-<i<il<irix, n. sp. PL I, fig. 5. 



Shell ovately conical, narrowly rimate, of a greyish colour; whorls (!, regularlv 

 increasing, a little convex, smooth, exhibiting oulv delieate growth-stria; ; spire 



* " Challenger " Gasteropoda, p. 603, pi. XLV, fig. 9. 

 f Voy. "Belgica," Mollusca (1903), p. i 1 1 , pi. V, li-. 55. 



