320 HFX'ORDS OP THE ACSTRALIAN MUSEUM. 



Oncis cinerea, Odhuer. 



Oiicis cinerea, Odhner, Kuiigl. Sv. Vet. Akademieiis Haudlingar, Hi., 16, 

 1917, p. 73, pi. iii., figs. 75, 76. 



" Body depressed, rounded ovate with tlie notaeum densely papillose 

 with rather regularly scattered small and lai'ge papilla?. Eyes only about 

 15, wide apart from each other, occupying chiefly the median part of the 

 notaeum. Hypouotnm smooth, its breadth about 1 of tlie foot sole. Anus 

 free, immediately behind the foot end. Respiratory orifice in the median 

 line, at of the breadth of the hyponotum from the anal pore. Colour 

 greyish, with a blackish dorsal stripe and an ovate blackish girdle round 

 the median part of the back ; toward the margin black dots. 



Dimensions : length 1>, breadth 85, height 3 mm. Locality Broome 

 (Western Australia) in the mangrove mud (18/6/1911). 1 sp. 



Though this specimen might only be a young individual, it cannot be 

 referred to any of the 9 known species constituting the genus Oiin's (cf. 

 Stautschinsky 1907). With respect to its shape, it shows close relation to 

 U. martensi, Plate, which has, however, a uniform lemon colour. Accord- 

 ing to Stautschinsky (1907), Oncidliuii and Oucis are ' richtiger als durch 

 Ubergangsmerkmale zusammenhangende Subgenera anzusehen' ". 



OnCIS chameleon. Brazier. 

 (Plate xxxviii., figs. 1-4.) 



Onchidium chameleuii, Brazier, Proc. Linn. Soc. N.S.Wales, x., 1886, p. 729. 



Id., Tenison Woods, Journ. Roy. Soc. N.S.Wales, xxii., 2, 1888, 



p. 170-171. Id., Lendenfeld, Proc. Linn. Soc. N.S.Wales, x., 1886, 



p. 730. 

 (Jncis chameleon (Brazier), Hedley, Journ. Roy. Soc. N.S.Wales, li. 



(Suppl.), 1918, p. M95. 



E.I tenia} rharacters. — Body elongate oval, back not strongly arched. 

 Mantle borders smooth. Hyponota smaller than the gi-eatest width of 

 the foot sole. Head small, tentacles short and conical and ringed ; eyes 

 at the tips black. 



Average size: Length 38 nun., bieadth 22 mm., height 17 mm.; 

 gi'eatest width of tlie foot sole 15 mm. 



Ma)itle ftrnlptii re. -The mantle is regularly and finelv granulated 

 over the "whole surface. No dorsal eyes are present, and branchial i)liimes 

 are absent. 



(Jiil.ov.r. — The ground colour above is olive ; two yellow and prominent 

 lines four mm. apart at the insides, originate two mm. from the anterior 

 edge of the mantle, and run backwards to join in a V, five mm. from tlie 

 posterior edge of the mantle. Yellow patches of variable shapes form an 

 irregular patterning. The foot and the head are yellowish in colour, and 

 the underside of the mantle is bluish-bhick. 



Position of opoiiinjs. — Typical of the genus. 



(xroap charartcr. — Appendicular gland and cartilaginous element 

 absent from the penis. 



