-Athomcoiiliorus.\ GASTROl'ODA . 793 



Philippines iii, pi. 15. f. 16. IT : Mutton, T.N.Z.I., xiv, 158, pi. 5, 

 f. 12-16 ; xvi, 173 pi. 10, f. M : Collinge, P.Z.S., 1894. 527, f. 1 in 

 text (Janella maculata) : Suter, P. Mai. S., ii, 249. 



Jaw elasmognathic ; smooth, thin, broad, slightly arched, with a 

 subquadrangular accessory plate proceeding backwards. 



Radula having the formula 255 + 1 + 255. Central tooth with a 

 simple or sinuated reflection, a median larger denticle and 2 to 3 smaller 

 ones on each side. Lateral teeth with a broad and narrow reflection, 

 a large inner and 5 smaller outer denticles. 



Reproductive Organs. The male organ is twisted upon itself, first 

 a little constricted, its upper portion convoluted, opening into the long 

 and thin vas deferens. Verge with papillae. Retractor muscle attached 

 to the distal end of the sheath of the male organ. The receptaculum 

 seminis is proximal, and there is a spermoviduct. 



Type in the Mus. Hist. Nat.. Paris. 



Hab. North Island : Bay of Islands (Dr. Pickering) ; Thames 

 (Adams) ; Waiheke Island (H. S.) ; Wairangi (A. Suter) ; Palmerston 

 North (W. W. Smith) ; Heretaunga ; Dannevirke ; Forty -mile Bush 

 (H. S.) ; Wellington (Hutton). South Island : Tasman Bay (Q. & G.) ; 

 Pelorus Valley ; Collingwood ; Greymouth ; Dunedin (H. S.). 



Remarks. The eggs are laid in small clusters sticking together ; 

 they are oval, yellowish-white, semitransparent, their major diameter 

 about 2 mm. ^ X' ^ flT 



Gould states that|the animals were^found coiled up, a condition 

 which no doubt is quite exceptional. 



I have re-examined a number of specimens which undoubtedly 

 represent CockerelPs Neojanella dubia. The central tooth of the 

 radula I found to be always symmetrical and exactly like that of 

 A. bitentacttlatus on the posterior part of the radula ; sometimes, but 

 not always, oblique or asymmetrical on the anterior part. The recepta- 

 culum seminis is mostly more proximal than the figure given by me 

 in P. Mai. S. shows, and the shape of the verge and the size of the other 

 generative organs may vary a good deal in the same species, as has 

 been pointed out by Plate. We are no doubt fully justified in assuming 

 that the specimen from the south side of Cook Strait in the British 

 Museum, and those from Pelorus Valley in my collection, represent the 

 typical A. bitentaculatus, Q. & G., which was found in Tasman Bay. 



Var. antipodum, Gray, 1853. 



Janella antipodarum, Gray, A.M.N.H., xii, 18.53, 414; P.Z.S., 1853 (1854). 

 112. J. bitentaculata, Q. & G. : Collinge, P.Z.S., 1894, 528 (anatomy). 

 Athoracophorus antipodum, Gray : Suter, P. Mai. S., ii, 1897, 24. Janelln 

 antipodum, Gray : Plate, Zool. Jahrb., Syst., xi, 272. 



Distinguished from the species by the absence of spots, the animal 

 being uniformly yellowish. The side groove descending to the anus is 

 mostly behind it, but sometimes in front. The anatomical differences 



