﻿1874.] G. and H. 'NaviW— On JYew Marine Mullusca. 25 



over f of its length, whereas in iV. semiplicata there are merely a few almost 

 obsolete striae at the base ; in JSf. Stoliczkana there is also a very distinct 

 second sutural row of well-developed granules, not existing in N. semiplicata. 



Long. 10 Mil., Diam. 5^ Mil. 



Calicut. (Coll. Dr. Stoliczka and Indian Museum). 



Nassa [Arculaeia] callospira, a. Ad, [? juv. ? n. sp.] PI. I. Fig, 5. 



We have long hesitated whether to regard the shell here figured as a 

 new species, or merely as a not fully developed form of AT. callospira 

 in which the characteristic callosity does not extend to the apex ; in this 

 latter typical stage, the Indian Museum possesses a single specimen also 

 from the Andamans, the sculpture appears to be perfectly identical, the 

 ash-coloured bands are somewhat more apparent in the form figured ; the in- 

 terior of the typical specimen is a light yellow, especially vivid within the 

 canal, but in the form here described, the interior, in the seven or eight 

 specimens seen, is a pure white. 



Long. 10| Mil., Diam. 7 Mil. 



Andamans. (Coll. Rev. J. Warneford, Dr. Stoliczka, andlndian Museum). 



Nassa [Niotha] sinusigera, A. Ad. var. Cernica, PL I. Fig. 7. 



At first we thought this Mauritian form might be separated as a dis- 

 tinct species, none of the eight or nine specimens seen are filleted with 

 brown in the manner figured and described by Reeve in his monograph of 

 the genus, the variety here named and figured being merely stained with 

 that colour at the sutures and at the base of the last whorl, especially vividly 

 round the basal canal ; the present variety, moreover, can scarcely be de- 

 scribed as '' granulated at the sutures," though indeed there is a slight trace 

 of something of the sort ; in other respects it agrees with the figure and 

 description of the typical form. 



Long. Hi Mil., Diam. 7 Mil. 



Mauritius. (Coll. Dr. Stoliczka and Indian Museum). 



RiSSOINA MINUTA, n. sp., PI. I. Fig. 15. 



Shell very small, shining, white, somewhat resembling B,. oheliscus, 

 Reel. ; whorls eight, angularly turreted, the first three thin, embryonal, with- 

 out sculpture, sometimes decollated in the adult, the others ornamented 

 with longitudinal, thick, slightly oblique, and somewhat irregular ribs, inter- 

 stices smooth ; last whorl with a single spiral row of prominent granules near 

 the base, at the termination of the ribs ; outer lip thickened, smooth. 



Long. 2i Mil., Diam. 1 Mil. 



Andamans. (Coll. Indian Museum and Rev. J. Warneford). 



RiSSOINA EVANIDA, n. Sp., PI. I. Fig. 14. 



Shell very small, white ; whorls six, convex, the first two embryonal, 

 4 



