SUTER : NEW ZEALAND ATnoKACornoraD^E. 249 



tube-like position of the free oviduct, the much shorter penis, sliarply 

 distinct from the vas deferens (Coliinge). 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 ^. hitentnculatus. 



This species is rather rare, and I have not seen it from any other 

 locality than the Forty Mile Bush, North Island, and Caplcston, South 

 Island. 



3. ATHORACornoRUS DUBiirs (Cockerell). 



Neojanella duhia, Cockerell: Proc. Zool. Soc, 1891, p. 217. 

 A. biteutaculatus, Suter, non Quoy & Gaimard. 



The genus Neojanella was founded by Cockerell on the absence of 

 a mantle-area and doi'sal 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 Athoracophorida3 is dependent on the degree of con- 

 traction of the epidermis. I 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. 



The 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 Neojanella duhia 

 to be only a large specimen of Ai/io7'acopJwncs hitentaculatus.' 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 A. hiten- 

 taculatus and a valid species. 



The colour-markings are the same as in A. hitentaculatus, iisually 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 d(U-sal 

 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 sceiiis 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 

 is the anus. The openings of the different organs are in the same 

 positions as in the tAvo foregoing species. My specimens are not so 

 large as the one described by Cockerell, which has a length (in spirit) 

 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 I have often 



1 Jahrlmch Dciits('li. nialuk. Ges., 1874, p. 196. 

 - Tiaus. Now Zealaud lust., vol. xxvi, p. 125, etc. 



