REPORT ON THE GASTEROPODA. 187 



interstices of the ribs. Spire rather high, conical, subscalar. Apex small, consisting 

 of three turbinate rounded whorls. Whorls 10, short, subcylindrical, constricted at the 

 top ; the last is hunchy, very short, round, with a very oblique contracted base. Suture 

 a little impressed, and slightly marginated in consequence of the comparative feebleness 

 of the ribs immediately below. Mouth round, open, very bluntly pointed above, and 

 produced below into the oblique, narrow, funnel-mouthed canal. Outer lip thickened 

 outside and in by a white varix, of which the one inside is scored by 10 or 12 long, 

 close-set, sharpish teeth ; it is arched throughout, is very slightly retreating, and very 

 patulous on the forward-arching base. Inner lip semicircular, with a thick white pad 

 of glaze, which has a sharp, prominent, and defined edge with a slight chink behind it ; 

 there is a strong blunt tooth above, several irregular and indefinite tubercles on the body, 

 and four or five round and biggish tubercles on the very short pillar, whose twisted, 

 patulous, and abruptly cut-off point is not flanged. H. 0"5 in. B. 0"25. Penultimate 

 whorl, height O'l. Mouth, height 0'21, breadth 0'17. 



Mr Marrat thinks I have mixed up two species here ; he regards the largest specimen as Nassa 

 proximo, C. B. Ad. ( = Nassa versicolor, C. B. Ad., fide Carp.), a Panama species, and holds the rest 

 as Nassa incrassata, Mailer, a North-Atlantic and British species. Dr Gwyn Jeffreys agrees with 

 me in considering all the specimens to belong to one species, and that not Nassa incrassata. Com- 

 pared with Nassa proximo, this species differs in being more contracted at the suture ; the whorls 

 are rounder and less flat, and lack the peculiar infrasutural contraction and flattening and the solitary 

 strong remote thread which lies there ; the spirals are stronger and more regular, while that species 

 is nearly smooth ; the embryonic apex is larger, its whorls being in that other species more minute, 

 while they are at the same time depressed or immersed. The longitudinal ribs, too, in Nassa 

 proximo, are fewer and weaker ; the mouth is larger, more oval, more produced at the lower outer 

 corner ; the outer lip is thinner, with fewer, narrower, less regular teeth ; the inner lip is much 

 more widely spread out on the body ; the pillar, too, is shorter. It has resemblances to Nassa 

 soMctce-helenw, A. Ad., to Nassa cinctclla, Gould, to Nassa coccinclla, Lam., to Nassa antillarum, 

 D'Orb., to Nassa ambigaa, Pult., to Nassa pygmcca, Lam., to Nassa nucleolus, Phil., and to Nassa 

 acvta, Say, with all of which this species has been very carefully and fully compared ; but it is 

 needless to detail the points of distinction. As regards Nassa incrassata, Miiller, that very variable 

 species has a very constant stain in the canal ; seen from above, the whole canal and pillar are 

 broader ; the longitudinal ribs are more regular, and these, like the spirals, are stronger, being both 

 rounder and higher ; and they run flexuously indeed but with a distinct trend from left to right, while 

 in the Challenger species the trend is from right to left. In Midler's species the apical whorls are 

 more rounded, and are parted from each other by a deeper suture ; the labial pad, too, is undefined. 



23. Nassa (Tritia) ephamilla, 1 Watson (PI. XL fig. 9). 



Nassa ephamilla, Watson, Prelim. Report, pt. 13, Journ. Linn. Soc. Lond., vol. xvi. p. 370, sp. 7. 



Station 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. N.E. from New 

 Zealand. 700 fathoms. Blue mud. Bottom temperature 40°. 



1 i<i>dfLi\\o;, a match for another, viz. Nassa woodwardi, Forb. 



