1912. ] E. GHosH: The Anatomy of a Slug. 183 
compact lobes. The groove between the foot and the mantle is 
shallow. The snout is elongated, with a small triangular mouth. 
Taking the above characters into consideration, it seems 
to me that the animal belongs to the subgenus Podangia,! and 
as the colouring of the body differs from that of P. schildit 
it may be provisionally designated as Atopos (Podangia) 
sanguinolenta. 
EXTERNAL CHARACTERS (pl. xxv, figs. 1 & 2). 
GENERAL. The animal is elongated, limaciform. The body 
is compressed from side to side and is tapering to a point at the 
posterior end. The height and width of the animal is greatest 
at about one-fourth the length from the anterior end. The 
surface of the mantle is granulated uniformly and it also bears 
small scattered tubercles in addition. The tubercles are more 
numerous on the lateral aspect specially towards the margin of 
the mantle. The keel in the middorsal line is prominent but 
rounded. The margin of the mantle (perinotum) is sharp, 
wrinkled and inflexed. ‘The foremost part of the mantle is bent 
over the head to form a hood-like covering. The anterior 
border of the hood is slightly notched. The posterior end of 
the mantle extends well beyond the foot. There is no distinct 
snout, the mouth being placed in a depression on the ventral 
aspect of the head. The head is distinctly separate from the 
propodium. The ommatophores are short, thick, and _ cylin- 
drical, and are marked with annular wrinkles, they seem to be 
non-retractile (i.e. non-invaginablej, as in all the specimens 
examined they were protruded to their full lengths although a 
little bit contracted. The lower tentacles are short, contractile 
and are each connected at the base with a flap of integument 
(precephalic flap) beneath. Each precephalic flap is a continua- 
tion forward of the head from the ventral aspect and is separated 
from its fellow of the opposite side by a long narrow gap 
extending behind to a little in front of the mouth. The anterior 
border of the flap is thin and convex; the outer border 
is broadly S-shaped, being concave in front and convex behind ; 
the antero-external angle is pointed and the antero-internal 
rounded (pl. xxv, fig. 4). The anterior end of the foot is truncated 
and is produced in front to form the propodium. The posterior 
end of the foot is narrow and pointed and it does not extend 
beyond the mantie border. The margin of the foot is produced 
into athin rim. The sole is wrinkled irregularly with small 
! The colouring of P. schildiz, as described by Babor (2), is as follows:—The 
dorsal surface of the mantle (notum) is dark brownish grey ; the foremost part 
of the mantle which forms a hoodlike covering of the head is of course pale. 
The head and foot are hazel-nut brown in colour. 
The anatomy of P. schildii having been compared with that of A. semper 
and Rathouisia in a few lines only, is of little use for the determination of the 
species. 
