MOLLUSCA. 49 



Nassa (Alectrion) ttnicolor, A. Adams, J'. /. S. Iti51, p. 10.3. 



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



Nassa rutilans. Reeve, I. r. p. 117. 



Nassa herns. 11. & A. Adams. Genera M"l. vol. i. pp. 110 & 119, 



pi. 12. fig. 7. 

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



Ih'h. Cape York, X. Australia (Juices) ; Torres Straits (Brazier) ; 

 Port Curtis and Port Alolle, Queensland, 12-20 fms. (Coppinger) ; 

 Sir C. Hardy's Island [Jules). 



New Zealand, the locality given by Peeve for X. 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. 



Ilimlsia suturalis, A. Adams, Proc. Zoul. Soc. 1853, p. 183 ; Soicerby, 

 Thes. Cvnch. iii. pi. 220. figs. 15, 10 ; Kobelt,in Rasters Con.-Cub., 

 Purpuracea, pi. 77. tigs. 11,12. 



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

 I. c. tig. 5 ; Kobelt, I. c. figs. 9, 10. 



Nassaria recur va, Sowerhy, I. c. figs. 17, 18. 



Nassaria sinensis, Sotcerby, Thesaurus, tigs. 8, 9; Kobelt, fig. 8. 



I lab. Port Darwin, North-west Australia, 8-12 fms. (Coppinger); 

 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 specios 

 which 1 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 costae 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 columellar callosity than young specimens, but the 

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

 in number. 



32. Phos scalaroides. 

 A. Adams; Sowerby s Thes. Conch, vol. iii. pi. 221. fio-. 13. 



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

 ■pinger). 



This form 1 cannot separate satisfactorily from P. plicatus and 

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



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