oNciiihiin.i: — i;i;ErNAi.i.. .'U9 



Mmitle ni-iiljil II fi'. — Tlic iiiMiitle is more oi' less tliickl}' beset witli 

 qraiiiiles and papilliv. 1 ii tlui middle field lliey aie spiiisely anaii<,'ed, but 

 ill tlie outer field t.lie}- ate dense ; tlie j)apilla' of the middle field are 

 smaller and inoi-e letraeled llisin those in the outer field, which are hu'jrer 

 and stand erectly. The j>apilla3 may bear fi-om three to four eyes. The 

 areas between the papilhv are finely granulated. 



Colour. — The li^rouiid colour of the mantle is olive ; a darker f)atch 

 occupies the midille field, and the papilla? are of a darker hue than tlie 

 ijround coloui', and some of them have a distinct rin^^ of darkei' colourinj^ 

 near the ape.x. The ground colour is more distinctly seen on the anterior 

 part of the body, while the outer field becomes rather darker in colour 

 because of the arrangement of the papilla^ in this ai'ea. The underside is 

 light brown, only the head and prominent lips being darker. 



Fosition of openinijs. — The anus is situated on a small papilla and is 

 not protected by the foot sole ; the resi)iiatory opening in the median line 

 is about 1 mm. from the anal papilla. Male and female openings typical 

 of the genus. 



Anatoiiiij. — Desci'ibed and figured by Stantschinsky. 



in'roiqi (•haracfer. — Appendicular gland and cartilaginous element 

 absent from the penis. 



Local'tty. — Queensland (type locality, Stantschinsky). 



ONCHiDruM ciNERKU.M, Quoij Kiid GainuinJ. 



Oiicliidiinit ciiiereuiii, Quoy and Gaimai'd, Voy. " Astrolabe ", Zool., ii., 

 1832, p. 661, pi. XV., fig. 29. Id., Semper, Reis. im Arch. Phil., iii., 

 Landmoll., vi., 1882, p. 280, taf. xx., fig. 11, taf. xxiii., tig. LS. LI., 

 Deshayes, Anim. sans Vert,, 2nd ed., vii., 1836, p. 710. 



( hichideJhi chierea (Quo}" and Gaimard), Gray, Fig. Moll. An., iv., 1850, 

 p. 117. Id., H. and A. Adams, Gen. Rec. Moll., ii., 1858, p. 234. 



E,cfer)i(d rJnir((cterf<.- — Body rounded and depressed. Head large, 

 tentacles small and conical. Mantle boiders smooth. Hyponota smaller 

 tlian the greatest vvidtli of the foot sole. 



Average size: Length 13 mm., bieadth 95 mm., height 7 mm.; 

 greatest width of the foot sole 6 mm. 



Mantle .'^cnljitirre. — The mantle is liberally covered with papillse, a 

 number of which is set in depressions which cause them to assume a 

 lateral direction. Thiee to foui' eyes ai'e borne on most of the papilliv. 

 The area between the papilla^ is tinel}' granulated. 



Colour. — The ground colour is a light brown, while a few flecks of 

 darker colouring may form an irregular pattern in some examples. The 

 underside is regularly a dirty yellow colour. 



Fosifio)!, of upciiiiifjs. — Typical of tlie genus. 



Anatomy. — Described and figured by Semper. 



Group character. — Cartilaginous hooks and tube absent, but a cartila- 

 ginous support is present with the appendicular gland. 



Londitij. — Tonga Tabu, South-western Pacific (Quoy and Gaimard ; 

 Semper, Godeli'roy Museum). 



