itoLLtrsoA. 49 



Nassa (Alectrion) .unicolor, A. Adams, P. Z. S. 1851, p. 106. 



Naasa unicolorata, Reeve, Conch. Icon. fig. 17. 



Nassa rutilans, Reeve, I. c. p. 147. 



Nassa Isevis, S. & A. Adams, Genera Mol. vol. i. pp. 116 & 119, 



pi. 12. %. 7. 

 Nassa (Zeuxis) unicolora, Kiener, Adams, I. c. p. 119. 



Hab. Cape Yorkj, N. Australia (Juices) ; Torres Straits (Brazier) ; 

 Port Curtis and Port Molle, Queensland, 12-20 fms. (Goppinger) ; 

 Sir C. Hardy's Island (Jukes). 



New Zealand, the locality given by Eeeve for iV. rutilans, is pro- 

 bably incorrect. 



The operculum of this species is unguiculate, curved, with a ter- 

 minal nucleus and simple unserrated edges. 



31. Nassaria suturalis, var. 



Hindsia suturalis, A. Adams, Proc. Zool. Soc. 1853, p. 183 ; Sowerhy, 

 Thea. Conch, iii. pi. 220. figs. 15, 16 ; Kobelt,in Kiister's Con.-Cab., 

 Purpuraeea, pi. 77. figs. 11, 12. 



Hindsia bitubercularis, A. Adams, P. Z. S. 1853, p. 183 ; Sowerby, 

 I. c. fig. 5 ; Kohelt, I. c. figs. 9, 10. 



Nassaria recurva, Sowerby, I. c. figs. 17, 18. 



Nassaria sinensis, Sowerby, Thesaurus, figs. 8, 9; Kobelt, fig. 8. 



Hah. Port Darwin, North- west Australia, 8-12 fms. (Gcyppinger); 

 China Sea, Philippine Islands, and Ceylon (Adams and Sowerby). 



A single specimen from Port Darwin agrees precisely with the 

 variety sinensis.' After a careful examination of the so-called species 

 which I have united above, I cannot detect any constant differences. 

 The above variety I believe to be founded on non-adult shells for 

 two reasons : — first, I find only six whorls, exclusive of the smooth 

 apical ones, being one less than in the typical suturalis; and, 

 secondly, the aperture is larger, a result due to the less degree of 

 thickening of the labrum and columella. It is true that the suture 

 is less excavated, but this concavity is variable in specimens un- 

 doubtedly normal. The number of costse is also inconstant, varying 

 from nine to twelve on a whorl ; in the former case, as might be ex- 

 pected, being thicker than in the latter. The tuberculation and 

 liration on the columella depend for the amount of their development 

 upon age, adult shells having a larger quantity and a greater expan- 

 sion of the free columeUar callosity than young specimens, but the 

 lirse within the outer lip, when countable, are generally about nine 

 in number. 



32. Fhos scalaroides. 

 A. Adams ; Sowerby's Thes. Conch, vol. iii. pi. 221. fig. 13. 



Hah. Prince of Wales Channel, Torres Straits, 9 fms. {^Cop- 

 ping er). 



This form I cannot separate satisfactorily from P. plicatus and 

 P. textilis, both of A. Adams ; and I am of opinion that were the 



