SUTER: NEW ZEALAND ATHORACOPHORIDA. 249 
tube-like position of the free oviduct, the much shorter penis, sharply 
distinct from the vas deferens (Collinge). The dentition shows no 
difference of any importance. Gray mistook the anus for the orifice 
of the reproductive organs, a mistake already corrected by Captain 
Hutton and P. Fischer, and does not say where he considers the anus 
to be situated. ‘The dimensions and the openings of the different 
organs are almost the same as in A. bitentuculatus. 
This species is rather rare, and I have not seen it from any other 
locality than the Forty Mile Bush, North Island, and Capleston, South 
Island. 
3. ATHORACOPHORUS DuBIUS (Cockerell), 
Negjanella dubva, Cockerell: Proc. Zool. Soc., 1891, p. 217. 
A. bitentaculatus, Suter, non Quoy & Gaimard. 
The genus Neganella was founded by Cockerell on the absence of 
a mantle-area and dorsal grooves. The former condition is common to 
the two species already mentioned, whilst the absence of dorsal grooves 
in a single spirit specimen is no proof that they are also absent in 
others. Heynemann has already pointed out? that the visibility of the 
dorsal grooves in Athoracophoride is dependent on the degree of con- 
traction of the epidermis. JI have many times had reason to confirm 
Heynemann’s statement; it entirely depends on the mode of preserva- 
tion whether the grooves will be very distinct or the reverse. 
Lhe specimen in the British Museum forming Cockerell’s type is 
from the south side of Cook Strait, exact locality not stated. Judging 
from the description published by Cockerell, I took his Weojanella dubia 
to be only a large specimen of Athoracophorus bitentaculatus.? 1 have, 
however, been able to procure specimens of what I take to be his 
species from Pelorus Valley, also south side of Cook Strait, and the 
following data will help to show that it is distinct from 4. bditen- 
taculatus and a valid species. 
The colour-markings are the same as in A. bitentaculatus, usually with 
two darker bands on each side of the back; but the body is more elongate 
and more highly rounded, the dorsal grooves are finer; a black ring 
round the respiratory orifice is not always present; the median dorsal 
groove extends to the head. The movements of the animal are much 
brisker than in any other species I have seen, and when fully extended 
the body seems to be almost cylindrical. In specimens I preserved in 
alcohol, and in formalin, the dorsal grooves are always visible, as well 
as the fine granulation. What Cockerell took for the genital orifice 
1s the anus. The openings of the different organs are in the same 
positions as in the two foregoing species. My specimens are not so 
__ large as the one described by Cockerell, which has a length (in spirit) 
a 
; 
of 53 and breadth of 11mm. It very much depends on the locality 
whether our native slugs attain a large size or not, a fact T have often 
ee 

* Jahrbuch Deutsch. malak. Ges., 1874, p. 196. 
> Trans. New Zealand Inst., vol. xxvi,. p. 120, ete. 
