MOLLUSCA OF INDIA. 223 
Animal rich ochre, sparsely dappled with grey-black on the mantle 
and tail. 
“ Length 3'"0, head to mantle 0'°50, mantle 1'-3, mantle to end 
of foot 1'"0, tentacles 0-38, 
“ Hab. Banks of Radha Pokri (tank), near Narainpur, Darrang 
district, Assam; only one specimen was found, in the early 
morning.” 
{t is a close ally of the Khasi-Hill forms G. hookeri, &c., but its 
very different coloration and markings distinguish it. ‘The shell 
is more rudimentary than in that species, being extremely thin and 
membranaceous, and is only a local variety on this side of the Brah- 
maputra of G. burtit. 
Grrasta crocea, G.-A. (Plate LX. fig. 2, drawn from life by the 
author, and Plate LXII. fig. 6.) 
Helicarion (Hoplites) croceus, Godwin-Austen, P. Z. S. 1872, 
Peo (nl ok es OO, 
Helicarion croceus (sec. A), Theob. Supp. Cat. p. 23; Pfeiffer, ed. 
Cless. Nomen. Helic. Vivent. p. 30. 
Parmarion croceus, Nevill, Hand-list, p. 13. 
Original description :—* Shell very flat, rudimentary, oblong, thin, 
horny, transparent, pale yellow-green, with a longitudinal band of 
dark green, most intense on the outer margin, extending from near 
the pale-coloured apex to the edge of the peristome; spire very 
short, apex flatly curved ; peristome membranous, very thin, trans- 
parent; within the single body-whorl the colour is pale milky with 
some blue reflections. 
“Diam. major 0°75, minor 0°35 inch. 
** Animal is of a fine bright saffron-yellow colour; when contracted 
it has a richer gamboge tint; mantle mottled with pale yellow; a 
narrow edging of yellow extends round that portion of the mantle 
covering the shell; another narrow band extends from the posterior 
left side of the mantle towards the anterior left side, fining out and 
terminating about 3 inch from the edge. From the posterior right 
side a short line of yellow extends as far as the respiratory orifice ; 
outside edge of foot very pale yellow, and almost white below; ex- 
tremity of foot truncate, with a gland asin H. gigas. Length of 
animal 21 to 3 inches; tentacles pale yellow, 0:45. 
“This very handsome species is very abundant during the height 
of the rains in the valleys below Cherra Poonjee ; and in the living 
animal the small portion of shell not hidden by the mantle-lobes is 
of a jet-black colour.” I first found it crawling over the tall grasses 
high above the ground, by the side of the road a few hundred feet 
above Teria Ghat. In the odontophore (Plate LXII. fig. 6) of 
this species we find considerable modification when compared with 
the type species, and there is a distinct approach to what is seen in 
Durgella khasiaca, viz., an even bicuspid central tooth. The first 
9 median teeth are indistinctly bicuspid, while all the outer are 
evenly biscuspid. The whole series decreases gradually in size to 
PART VI. x 
