Mollusca from the Arabian Sea. 263 
N., long. 69° 24! 20" E., Arabian Sea, off Gujerat, in 44 
fathoms (‘Znvestigator ’). 
These specimens differ’ from what may be regarded as the 
typical form in having the periphery of the whorls marked 
with a double instead of a simple acute keel. 
Nassa pseudoconcinna. 
Testa elongato-pyramidalis, turrita, albida, subpellucida, fasciis 
tribus dilute rufis supra anfractum ultimum picta; anfractus 8, 
convexi, supremi quatuor leves, in medio carinati, ceteri costis 
numerosis arcuatis sulco infra suturam bisectis instructi, in inter- 
stitiis spiraliter sulcati, ultimus prope basin costis plus minus 
nodosis ; apertura irregulariter subovalis, longit. totius 3 vix 
equans ; labrum ad marginem acutum intus paulo incrassatum, 
tuberculis circiter 9 munitum, extus leviter varicosum ; colu- 
mella arcuata, callo tenui circumscripto induta, tuberculo minuto 
superne instructa ; canalis anterior latus, obliquus, brevissimus, 
recurvus, 
Longit. 15 millim., diam. 8; apertura 7 longa, 4 lata. 
Hab. Lat. 21° 30! 15" N., long. 68° 05" 45' E., Arabian 
Sea, off Gujerat, in 82 fathoms. 
N. concinna, Powis, appears to be the nearest ally of this 
species. It is, however, larger, has ten less convex whorls, 
the body-whorl is more contracted at the base, the basal canal 
is narrower, the outer lip more strongly varixed. In con- 
cinna the three brown bands extend over the varix, whereas 
in the present species they stop short of it, so that it has a 
pallid look. The thickening within the lip is faintly yellowish 
and slightly removed from the acute edge. 
In describing N. turrifera (Ann. & Mag. Nat. Hist. 1895, 
vol. xvi. p. 5) I regret having overlooked N. babylonia of 
Watson, which is quite identical, and was obtained in 375 
fathoms off the Philippine Islands. 
Distortriz cancellina (Roissy), var. 
Triton cancellinus (Roissy), Reeve, Conch. Icon. sp. 45; Kobelt, 
Conch.-Cab. ed. 2, p. 200, pl. lvil. figs. 5, 6; Kiener, Icon. Coq. Viv. 
p. 21, pl. xiv. fig. 1; Tryon, Man. Conch. vol. iii. p. 35, pl. xvii. 
tig. 175; Kiener, Icon. Coq. Viv. pl. xiv. fig. 1 (as 7. elathratum, 
Lam. ). 
Hab. Philippines, China, Ceylon. 
Var. ridens. 
Triton ridens, Reeve, l. c. fig. 46; Tryon, pl. xvii. fig. 177; Kobelt, 
pl. lviii. fig. 4. 
Hab. Philippines. 
