MOLLUSCA OF INDIA. 47 
tooth, with the small points on the exterior side. Internal shell 
present, white, calcareous, with no epidermis; nucleus on the 
side. 
« Animal at first sight is ike our German Arion and Limav. It 
is related to Arion, to Limax only similar. 
« The relationship to Arion is in the form of the jaw, which has ribs 
like that of A. empiricorum, but they differ in the following points :— 
Arion. Anadenus. 
Tail-gland present. absent. 
Respiratory opening anterior close behind. 
to middle of mantle. 
Internal shell, absent. present. 
The mantle contains only with distinct lines of 
scattered calcareous par- growth. 
ticles. 
“The absence of the tail-gland is the principal difference between 
Arion and Anadenus ; less importance must be placed on the posi- 
tion of the lung-opening. In dead Anadenus it is in the middle ; 
but the front part of the mantle always contracts more than the 
hinder part. In Limav it lies behind the middle, but in a spirit- 
specimen it is in the middle. 
* The new species is nearest to Geomalacus of Great Britain, which 
I have not had an opportunity of examining, and from which it 
differs in the following points :— 
Geomalacus. Anadenus. 
End of the body rounded. pointed. 
Respiratory orifice in the behind the middle. 
middle of the side of the 
mantle. 
Tail-gland present. absent. 
‘Tt must not be confounded with Lima, although it is similar in 
general form, in the position of the respiratory and the genital aper- 
tures, and in the presence of the inner shell; besides they differ in 
the jaw and in the terminal end of the body, which in Limaa is 
always keeled, whereas in Anadenus there is no sign of a keel. 
«‘ Tf we could see the living animals or get an accurate description 
of them, undoubtedly further diiferences between similar or related 
forms would be shown, and in one respect from the formation of 
the wrinkles of the mantle and the body. As I observed before, in 
the dead animal the wavy circles on the mantle disappear. It 
cannot be said whether the mantle of Anadenus is papillate, as in 
Arion, Amalia, and Geomalacus, or whether it has the structure of 
Limax. Similarly the wrinkles on the back flatten out, and no 
accurate description can be made from a spirit-specimen. 
‘«¢ From the illustration which I give [ reproduced, Pl. VII. fig. 4] of 
the skin of the back it is clear that it differs considerably from all 
known slugs. A furrow runs along the middle of the back, from 
which side-furrows branch off at an acute angle the spaces en- 
