MOLLUSCA OF INDIA. 59 
and thin tube terminating in a round ball-like expansion, which is 
like in this respect to H. maillardi. Hyalimax andamanica, how- 
ever, differs from this Bourbon species (1) in the form of the jaw, 
which has no indication of a central projection; (2) there 1s con- 
siderable divergence in the shell, and I give a drawing of that of 
H. perlucidus (fig. 10), from Mauritius, received by me from Mr. G. 
Nevill, which shows the apex to be very attenuate and sharp, and 
there is a distinct greenish epidermis; (3) the dental formula is 
different ; (4) Fischer does not indicate the position of the anal 
aperture, which, situated in H. andamanica so far back on the 
posterior right margin, is of extreme importance, so that if other- 
wise in Hyalimax of Bourbon, and in its usual position adjacent 
to the respiratory orifice, it may render it necessary to place the 
Indian form in another subgenus, which I would name Jarava, from 
the name of the aboriginal tribe that inhabit the South Andaman 
Islands. In this case a subfamily Hyatrmactna would include 
1. Hyalimac (perlucidus, Isle of France; mauritianus, Isle of France ; 
maillardi, Bourbon), and 2. Jarava (reinhardi, Nicobars; anda- 
manica, Andamans; viridis, Arracan). 
In the form of the buccal mass, the broad radula and its 
numerous teeth, andamanica resembles in a remarkable manner the 
curiously formed New-Zealand slug Janella antipodarum, Gray, 
described and figured by Mr. C. Knight in the ‘ Transactions of the 
Linnean Society,’ vol. xxii., read June 2, 1859; and they all must 
be regarded, with Succinea and others, as one great group, indicated 
so well and on such good grounds by Mr. P. Fischer. 
From the islands of the Bay of Bengal we also have another 
species 
FyaLimax (JARAVA) REINHARDI, Morch. 
Hyalimax (Jarava) reinhardi, Morch, Journ. de Conch. July 1872, 
p. 314, 
Original description :—“ C. lingueforme, postice acuminatum, pal- 
lide inerescens. Ommatophoria cerulea. Tentacula brevissima. Pal- 
lium ellipticum, prasinum, orificio respiratorio in medio marginis 
dextri sito. Notewm pedis sulcis radiantibus distantibus et sulco obso- 
leto peripherico circumdatum. Testa scapuleformis, latere dextro recto. 
Mazille crista muscularis angusta, longitudinis fere dinudium maxille. 
Long. 45 mill., long. pallii 22 mill., lat. 11 mill., long. notei 
pedis 17 mill. (ex icone). 
“Hab. Pulo Panjang et Sambelong. Cette espéce a été recueillie 
sur le coté inférieur des feuilles de Calderon et d’autres végétaux a 
feuillage épais. L’animal se tient habituellement immobile et con- 
tracté, en effectant une forme ovale. L’attache musculaire de la 
machoire est plus ¢troite et plus allongée que chez lH. maillardi, 
Fischer (J. Conch. 1867, p. 218, t. x. f. 5, 9).” 
This species would appear to be very similar to the Andaman 
form, but larger; until, however, they are compared together in 
greater detail, or we obtain drawings of the animals from life, I 
think it best to keep them separate. 
