Athoraeophorus.] GASTROPODA. 801 



Measurements of my largest specimen : Length over back from 

 head to tip of tail, 46 mm. Width of back, 24 mm. Sole Length, 

 34 mm. ; breadth, 8 mm. Breadth of hyponotum, 2 mm. Distance 

 of anus from right tentacle, 8 mm. Distance of anus from pulmonary 

 orifice, 6 mm. Distance of anus from perinotum, 5 mm. Distance of 

 pulmonary orifice from head, 11 mm. 



Jaiv small, elasmognathic, with a broadly triangular and rounded 

 median projection. 



Radula (fig. 8a) with very numerous teeth. The central tooth has, 

 according to Simroth's figure, 4 small equal denticles, but the radula I 

 examined showed the central tooth to have always 2 cusps, the right 

 cusp bearing a single large cutting-point, but the left reflection had 

 either 1 smaller denticle or 2 to 3 very small denticles ; thus the 

 number of denticles varies from 2 to 4. Lateral teeth with 7 den- 

 ticles, the innermost largest, followed by a minute tooth, the third 

 larger again, and the outer four very small. 



Reproductive Organs. The hermaphrodite gland is, as usually in 

 the genus, in front of the liver, and consisting of 2 lobes. The albu- 

 men-gland is small. There is no spermoviduct. Oviduct long, cylin- 

 drical, with a glomerate gland at its upper part. Below the albumen- 

 gland is a small prostate, from which the free vas deferens descends. 

 Receptaculum seminis small, oval, with a short neck, distally inserted 

 on the long vagina. Sheath of male organ long, inflated, narrowed 

 behind where the vas deferens enters and the retractor muscle is 

 affixed ; male organ cylindrical, convolute, with regularly arranged 

 papillae. 



Type in the Kgl. Museum fur Naturkunde, Berlin. 



Hab. Auckland Islands (Dr. Krone, Captains Hutton and Bollons, 

 and Professor Benham) ; Macquarie Island (Dr. Colquhoun). 



6. Arthoracophorus papillatus, Hutton, 1879. Plate 31, figs. 9, 9a. 



Jnndla papillata, Hutt., T.N.Z.I., xi, 1878 (1879), 332; M.N.Z.M., 27. 

 J. bitentaculata, var. papilla tn, Hutt., T. N.Z.I., xvi, 206; Hedley, I.e., 

 xxv, 158. J. papillata, Hutt. : Hedley and Suter, P.L.S. N.S.W. (2), 

 vii, 661 ; Plate, Zool. Jahrb., Anat., xi, 202, pi. 11, f. 39. Athoraeophorus 

 papillatus, Hutt. : Suter, J. de Conch., xli, 235 : T.N.Z.I., xxvi, 124, 

 pi. 14, f. 6-9 : P. Mai. S., ii, 251 ; vii', 325. 



Animal attaining a rather large size, the back broadly convex, tail 

 tapering to a sharp point ; colour yellowish-olive, with or without 

 brown spots ; head-shield with a median groove ; notum finely granular, 

 with 1 to 3 larger papilla? in each lateral area ; mantle-area triangular, 

 long and narrow. Colour yellowish-olive, sometimes brownish, very 

 often without any colour-markings, but sometimes with rows of rather 

 large brown spots ; the dark-coloured specimens have the papillae 

 lighter-coloured ; sole light-yellowish. Head with long cylindrical 

 tentacles, the anterior half narrower than the posterior, and telescoped 

 into the latter when retracted. The oval oral lobes are separated in 



26 -Moll. N.Z. 



