3 = 5 



(-l(isol\- ribbed, in colour, distinctness ami breadth of the band. However it is inipossil)]e lo me 

 to se[)arate them. Tuvox thinks that \. frauduloita Marrat (On some pi'oposcul new forms in 

 the genus Nassa, p. S, pi. i lig. 24) may be identical, but Makkat's words: „Callo cohimellaris 

 albo maxi))io' and his opinion that this species is closely allied lo X. globosa, are not in favour 

 of that view, though the back view of the shell, the only figure given by Marrat, has much 

 resemblance. N. cribraria IMarrat (I.e. p. 12, I'l. i, hg. 20) has another aperture, without iIk; 

 characteristic basal sinus of the peristome. 



39. Xassa (Niotha) gratiosocostata n. sp. PI. XX, fig. 5. 



Stat. 64. Kambaragi-bay, Tanah Djampcah. Up to 32 M. Coral and coralsand. i Spec. 



Shell ovately conical, ventricose, with rather short, sharp spire, cream coloured, faintly 

 two-banded with reddish-browm, more conspicuously brown-coloured on the back of last whorl. 

 Whorls about Sy^, of which 3 form a small nucleus, subsequent whorls moderately convex, 

 separated by a deep suture and nearly tabulated, their sculpture consists of ribs running from 

 one suture to the other, 22 on last whorl, these ribs are crossed by thinner spiral lirae, which 

 in passing the ribs, make them subgranose; upper row of granules very conspicuous, bordering 

 the suture and separated from the rest of whorl by a groove ; last whorl very convex above, its 

 basal part strongly granose. Aperture oval, its upper corner with a rather broad canal, formed by 

 the upper part of peristome and the fold on body-whorl. Peristome rather thin, externally with 

 a broad, flat rib, internally with 1 2 lirae, of which the upper and basal ones are the strongest 

 and border the canals. Columellar margin with a conspicuous but not widely spreading callosity, 

 which is porcellaneous, white, granose on the body-whorl, by the granules of the ribs, with 

 irregular plicae on the lower part, ending in a strong, curved fold ; basal canal rather wide, deep 

 and slightly upturned. Interior of aperture white, with a slight brownish hue in its depth. 



Alt. 1 6, lat. 8^^, apert. alt. (with canal) 8, lat. 4^3 Mill. 



This species belongs to the alliance of N. livescens Phil., but may be distinguished by 

 its sharper, granose sculpture, it is considerably narrower in proportion to its length than that 

 species, the enamel on the body-whorl is less extended, its upper margin being horizontal in 

 N. livescens and the allied N. Kieneri^ the basal fold of the columella is more oblique and 

 straighter in the new form than in livescens. Mr. Melvill who had the kindness to compare 

 it in the British Museum, writes about it: "I also compared it with a variety (so labelled) of 

 livescens Phil, this being smaller, with shorter spire than the type. Your shell is much like a 

 miniature of this and the mouth is likewise very similar. It will perhaps however bear differen- 

 tiation". After all it may prove to be only a variety of N. livescens^ but as long as no more 

 materials are known, I prefer on account of the differences mentioned above, to keep it separate. 



40. Nassa (Niotha) pusio A. Adams. 



A. Adams. Proc. Zool. Soc. Lond. 185 1, p. 100. 



Reeve. Conch. Ic. Vol. VIII, Nassa, fig. 172^:. 



Tryon. Man. of Conch. Vol. IV, p. 54, Pi. 16, fig. 305. 



79 



