17 



Localities :— Launceston (W. F. Petterd) and Hobart (W. 

 Xe grand. 



MiLAx NiGRicoLus, nov. sp. 



Eesembles M. Tasmanicus, but is less robust, and the 

 surface is not so much wrinkled. 



General colour black, with bluish-black sides ; head 

 bluish-black ; under side of foot grey ; upper tentacles 

 bluish-black, short ; neck black, with two median longi- 

 tudinal grooves. 



Shield elongate-oval, deep black, shagreened, with a 

 rhomboidal commissure on hinder part ; body carinated from 

 the shield ; back with diverging grooves from the shield, 

 granulated between ; respiratory orifice, post median ; ^^enis, 

 strap- shaped, a little behind front edge of the shield, spirally 

 coiled. Length, IJ inches. 



Locality : — Inhabits the gullies of the Adelaide hills, and is 

 widely dispersed over the Adelaide Plain. 

 Cystopelta, nov. gen. 



Derivation, in allusion to the inflated or bladder- like shield ; 

 animal slug-like ; body attached for half its length to the 

 back of the foot; mantle very large, enveloping the whole 

 animal in repose, but from beneath which the head and the 

 tip of the tail alone are visible from above, when the animal 

 is crawling ; tentacles, four ; tail with a mucous pore at the 

 tip ; mandible like that of Avion ; lingual teeth resembling 

 those of TestaceUa. 



■Cystopelta Petterdi, nov. sp. 



Animal elongated, somewhat slender ; mantle rather of a 

 leathery consistency, very large, dilated behind, and pro- 

 jecting laterally, so as to cover the whole animal excejjting 

 the end of the foot, and the head as far as the tentacles ; 

 surface smooth, or minutely wrinkled all over ; brown, or 

 blackish-brown, sprinkled with whitish and blackish minute 

 spots, darker towards the posterior margin ; free as far as 

 the pulmonai'y orifice, which is situated at about one-third 

 the length of the shield from the front margin. JSTo shell. 



Foot narrow, strap-shaped, tapering posteriorly, perpen- 

 dicularly sulcated on the sides, and margined by a groove 

 above. It is of a similar colour to that of the shield, but 

 "the part exserted beyond the mantle is marked with black 

 lines en chevrons on a white spotted ground. Mucus colour- 

 less. 



Tentacles, four, the upper five millimetres long, minutely 

 granular at the base, and becoming smooth towards the apex, 

 which is black ; lower pair, two millimetres long, pale in colour. 



Penis cylindrical, stout, long, and slightly dilated at the 



C 



