GASTROPODA. [Pulmonatu. 



observed by Collinge ar? explained by Plate, the animal of A. antipodum 

 ( = bitentaculatus, Collinge) being sexually immature. 



The measurements are the same as in the species, also the jaw and 

 radula. 



Type in the British Museum. 



Hnb. Forty-mile Bush ; Capleston. 



Subsp. rufovenosus, Suter, 1909. Plate 31, figs. 4, a, b. 



Athoracophorus bitentaculatus, subsp. rufovenosti*. Nuter. .1'. Mai. S., viii, 

 1909, No. 5, 322, f. 1-3 in text. 



Animal limaciform, moderately large, broad with more or less 

 rounded tail when at rest, semicyliudric with pointed tail when 

 crawling, semitransparent, with an opaque and darker central area 

 when alive. Colour yellowish, with numerous small white papillte, 

 median and side grooves reddish-brown, with. 4 longitudinal rows of 

 brown spots close to the side grooves ; mantle-area and its neighbour- 

 hood orange ; sole yellowish-white. Spirit specimens are light yellow, 

 the grooves more or less brown, and the spots are sometimes indistinct. 

 Head with two distinct oval oral lobes, tentacles cylindrical ; head- 

 shield extending to about midway between head and mantle-area, 

 with a median groove. Notum densely covered with small papillae, 

 median and lateral grooves well pronounced, the latter occasionally 

 bifurcating, their number being about 14 on each side, 10 of which 

 are post-pallial. Mantle-area open on the right side, the respiratory 

 orifice not far from the median groove, the renal opening in front of it. 

 Anus on the right side, close to the periuotum, in a triangle formed 

 by the pre- and post-anal grooves. Generative orifice on the outer side 

 of the right tentacle. Hyponotum broad, perinotum thread-like. Sole 

 aulacopod through contraction in alcohol. Shell rudiments consisting 

 of about a dozen small calcareous white grains of various size and 

 shape, the largest of about If mm. 



Measurements of a large spirit specimen : Length over back from 

 head to tip of tail, 37 mm. Width of back, 9 mm. Length of sole 

 33 mm. ; width, 4 mm. Breadth of hyponotum, 2-5 mm. Distance of 

 anus from right tentacle, 7 mm. Distance of anus from pulmonary 

 orifice, 9 mm. Distance of pulmonary orifice from head. 10 mm. 

 Distance of generative pore from pulmonary orifice, 9 mm. 



Jaw elasmognathic. 



Radula (fig. 4a) with very numerous teeth, the central tooth with a 

 large median and 6 lateral denticles, 3 on each side. Lateral teeth 

 with an inner large and 6 outer smaller denticles. 



Reproductive Organs (fig. 4&). The hermaphrodite gland is of mode- 

 rate size, brownish ; the albumen-gland rather large, smooth, yellowish- 

 white ; there are no accessory glands below it ; the prostate above and 

 the oviduct below are of nearly equal size ; the latter is prolonged into 

 a somewhat convoluted free oviduct with a proximal receptaculum 



