l62 JOURNAL OF CONCHOLOGY, VOL. II, NO. 6, APRIL, I905. 



but regularly spirally striated, striae about ten in number, filiform and 

 slightly punctured, becoming obsolete on the last two whorls, except 

 at the base of the last of all, where they reappear more coarsely 

 developed than before ; there are also five varices, somewhat incon- 

 spicuous, at intervals on the last four whorls, which also show, under 

 a lens, minute longitudinal striation, the striae close set, fine and 

 flexuous ; aperture oval, rather large, with the peristome thickened 

 and denticulated with four equidistant, relatively somewhat small, 

 digitate processes. 



"Long. 76, diam. 28 ; from the apex to suture of the last whorl 29^, 

 from base of the aperture to end of the "canal " 6^ mill. 



"This highly interesting and very characteristic form, quite unlike 

 any other of the seven known living species of the genus (as restricted) 

 was dredged in deep water off Cheduba, Arrakan Coast, by Surgeon 

 J. Armstrong, late Naturalist to the Indian Marine Survey." 



" This species has now become recognised as a quite characteristic 

 inhabitant of the infra-littoral of the Bay of Bengal at and near the 

 loo-fathom contour, as far as this has yet been explored by the 

 ' Investigator,' from Arrakan to the Godavari. The living animal is a 

 bright pink, and it has imparted to the spirit in which it was preserved 

 a beautiful magenta colour, which has stained permanently the packing 

 material, the legs and branchiae of some Penaei, and tiie soft tissues 

 of a Chastopod and of some other moUusks, contained in the tin in 

 which it was first placed. The eyes are very large. The animal is 

 possessed of great vitality, and though coming from a considerable 

 depth, lives happily for days in a bucket of sea-water, and appears to 

 be unaffected by prolonged deprivation of water in the moist atmos- 

 phere of ship-board. 



"The type appears to have been described from an abnormally thin 

 and varicose shell, which also, judging from the slight development of 

 the digitate processes of the outer margin of the aperture, was 

 probably young. The thinness of the type specimen is perhaps to be 

 explained by its having come from a greater depth, our present series 

 showing that the thickness of the shell varies inversely as the depth. "^ 



" Many specimens in various stages of growth from station 119, 95 

 fathoms. This form, already noticed to be characteristic of the Bay 

 of Bengal infra-littoral at and near the loo-fathom contour from 

 Arrakan to the Godavari, is now found off the Kistna Delta, about 

 70 miles further south." - 



It has been dredged by Mr, Townsend in various stations as 

 enumerated in the following paragraphs : 



1 Wood-Mason and Aloock, Ann. &> Afa.g'. IVai. Nisi. (6), vol. 7, pp. 16-17, fig- 3i 1891. 



2 Wood-Mason and Alcock, Ahh. &^ Afa^. Nat. Hist. (6), voL 8, p. 444, 1891. 



