792 GASTROPODA. [Pulmonata. 



Subgen. 1. ATHORACOPHORUS, s. str. 



1. Athoracophorus bitentaculatus, Quoy and Gaimard. 1832. 

 Plate 31, fig. 3. 



Umax hit* ntw.ulatu*, (.). & G., Voy. Astrol., ii, 1832, 149, pi. 13, f. 1-3. 

 ./ 'mi, Hi liiti-,it,'i.cul(tta, Q. & G. : Hector, Cat. Land Moll. N.Z., 1 ; Hutton, 

 M.N.Z.M., 27 : T.X.Z.L, xvi, 206 ; CockereU, P.Z.S., 1891, 217 ; Hedley. 

 T.N.Z.I., xxv, 158; Hedley and Suter. P.L.S. N.S.W. (2), vii, 661. 

 ./. maculata, t 'ollinge, P.Z.S., 1894, />27. Athoracophorus bitentaculatus. 

 Q. & G. : Gould, U.S. Expl. Exp., xii, 2 : Suter, J. de Conch., xli, 234 : 

 P. Mai. S., ii, 247, f. 1, 2 in text (teeth of radula) ; I.e., viii, 322 : Plate. 

 Zool. JahrK, Syst., xi, 1898, 200, pi. 19, f. 9, 13. Neojanellu dvbia, 

 Cockerell, P.Z.S., 1891, 217; Hedley, T.N.Z.I., xxv, 159; Suter, 

 T.N.Z.I., xxvi, 125. Athoracophorus dubius, Cock. : Suter, P. Mai. S., 

 ii, 249, f. 3-9 in text (anatomy) ; Plate, i.e., 273. 



.-iinmal elongated and rounded above when crawling, broadly ovate 

 and flattish when resting, yellowish with irregularly scattered brownish 

 spots, head-shield with a median groove, mantle-area not closed, anus 

 near the perinotum. Head with two triangular oral lobes, approach- 

 ing in the middle, from whence an oblique frontal groove ascends on 

 each side to the outer side of the tentacles, descending again towards 

 the base of the oral lobes. The two tentacles are moderately long, 

 cylindrical, somewhat inflated at the end, where the eyes are situated. 

 Notum convex, covered with minute rounded tubercles ; head-shield 

 not quite half the length between front and pulmonary orifice, with a 

 median groove ; mantle-area open on the side, the respiratory orifice 

 near the median groove, and in front of it a small triangular area of 

 lighter colour with the renal orifice in the median dorsal groove and 

 behind the anterior lateral groove. Anal orifice below the renal and 

 close to the perinotum ; there is no preanal groove. Generative 

 opening close to the outer side of the right tentacle. The late n- 1 

 grooves number about 10 to 15 on each side, 8 to 10 of which are post- 

 pallial ; they are shallow, oblique behind the mantle-area, very seldom 

 bifurcating towards the margin. In spirit specimens the hyponotum 

 is quite distinct, fairly broad, the lateral grooves passing (through 

 contraction in alcohol) over it and partly also over the aulacopod 

 sole ; the tripartite sole is also a result of contraction only. Perinotum 

 forming a thread-like ridge. Sole extending to the sharply pointed 

 tail. The rudimentar^ //' // is represented by about a dozen calcareous 

 transparent oval or rounded grains of various size, the largest of about 

 1| mm. diameter. 



Measurements of a medium-sized spirit specimen : Length over 

 hack- from head to tip of tail, 33 mm. Width of back, 10mm. Length 

 of sole, 31 mm. ; breadth of sole, 3-5 mm. Breadth of hyponotum, 

 2-5 mm. Distance of anus from right tentacle, 6 mm. Distance of 

 anus from pulmonary orifice, 5mm. Distamv of pulmonary orifice 

 from head, 8 mm. 



.ln<it<>,,it/. -Zeitschr. i. wissenschaftl. Zool., xv, 446, pi. 24, f. 3-5 : 

 Trans. Linn. Soc., xxii. pi. 46, f. 6-11 : Semper, Reise in Arch. 



