810 KECORDS OF THE ATSTKALIAX MUSECM. 



Average size: Leugtli :^'l cm. breadth, 8 cm., height 2cm. Greatest 

 width of the foot sole 1'5 cm. 



Mantle sculpture. — Tlie mantle is liberally covered with simple and 

 compound tubercles. Simple tubercles are more numerous than the 

 compound ones and varv in size to about 1"2 mm. in diameter. Comi)ound 

 tubercles are repi-esented by rosettes of from five to seven simple tubercles. 

 Short and bunched bi-anchial paj)ilhv cover an area of the posterioi- Held 

 of the mantle. A few tubercles bear from two to Hve dorsal eyes; the 

 number and arrangement of these seems to be very variable and is fully 

 discussed by Semper /.<■. 



Colour. — The gi'ound colour above is olive : flecks of bi'owii form a 

 variable pattern in different specimens, while tlie underside is legularly a 

 lightei- olive than the upper side. Tlie top of the head is as diirk as the 

 ground colour of the mantle. 



Fositioii of opeuiiKjg. — The ;inal papilhi is j)artly {)rotected \)\ the 

 tail of the foot ; the respiratory opening in the median line is closei' to 

 the anal papilla than to the numtle border. Male and fenuile genital 

 openings typical of the genus. 



Anatoiinj. — Described and figured by Cuvier and Bergh : jiarlly 

 described and figured by Plate, Farrau, Keferstein and others. 



(iroiip character. — Anterior portion of the penis with cartilaginous 

 hooks ; posterior portion smooth aud without cartilaginous element. 



Localities. — Brisbane (Semper, Grodelfi'oy Museum) ; Samoa (Semper, 

 Godeffroy Museum) ; Cape York and Port Mackay, Queensland (Sempei-, 

 Kieler Museum): Port Curtis, Queensland (Kesteven Australian Museum); 

 Broken Bay, New South Wales (Australian Museum). 



OXCHIDICM NKIU-LOSUM, Sniipt'r. 



Onchidiniii tiehulosuni, Semper, Reis. im Arch. Phil., iii.. Landmoll.. v., 

 1880, p. 257, taf. xxi., tigs. 2-4. 



Onci(Jii(tii iit'lniliisiiiii (Seni|)er), Plate, Zoo). Jiihrh., Anat., vii., lS98, p. 171. 



I'j.iti'riiiil c/ntrKcters. — Body oval, b.ick sti'ongiy Mrched. Head small, 

 tentacles long. Hyponota sloping and raised, and snuiller tiian the 

 greatest width of the foot sole ; the lattei- flat and much bi-oader at the 

 anterior than the posterior end. 



Average size: Length 42 mm., breadth 28 mm., height 1(> mm. 

 Greatest width of the foot sole IG mm. 



Mmilli' .<(-iiliifin-r. — The maiilh- is i-egularl\- and thickly covered \\\\\\ 

 small papilla' ; at the posteiior eml the papilla' aii' inoii' di-nsi-ly aiTanged 

 and appear to be grouped. Seven to nine eyes -aw present on nnmy 

 papillae. 



Colour. — The uppei' surface is regularly brownish in coloui', with an 

 irregular pattern of lighter and darker flecks ; the underside is a dirty 

 yellow, the upper side of the head being a bluish black. 



