oNCiiiiiiin.i-: — i:i;ktnai,i.. 325 



especially ill the |)a(toriiiii<;-, wliicli varies I'lDiii t hat of (^iioy and ( iaiiiiaid's 

 figure to that of Seiiiper's (>. ii'liciildhtiii. 1 have no iloiiht that (J. ifllc- 

 nlafiiiii, Semper, is synonyinous with this species, and from Couthony's 

 tigure of (>. nmnjiitnta this species must be very closely related. 



LtK'idUii. — -Port Jackson, New South Wales (Hedley) ; Lauuceston, 

 Tasmania (Simsoii and Bretnall, Australian Museujn); Sydney (Semper, 

 as (}. rcticitli(linn ; Museum Godeft'roy). Previously recorded fi'om North 

 and Soutli Islands of New Zealand, and (Chatham Island. 



On'CHIDINA AUSTKAi.is ((irav, m.s.), Sciiijifr. 



( hicliiiliuti Kiis/nilis (Ciray, m.s.). Semper, Keis. im Arch. I'hil., iii., Land- 

 moll., vi., 18S2, p. 287, taf. xix., figs. 14, 15, laf. xxi., fig. 27, taf. 

 xxiii., tig. 10. 



(hieidiuif (instriili>< ((Jray, Semper), Plate, Zool. Jahrb., Anat., vii., 1893, 

 p. 208. 



Oiichidella, .•<j). Schmeltz, Cat. Mus. Godeffroy, v., 187-i, p. 96, No. 1843. 



E.i'tennil characters. — Body oval, back strongly arched. Underside 

 flat. Head medium in size, tentacles short. Mantle borders smooth. 

 No hyponota. 



Average size : Length 30 mm., breadth 13 mm., height 10 mm. 



iLuitle sculpt K re. — -The mantle is finely granulated between irregularly 

 placed papillje; the latter stand from three to four mm. apart, and appear 

 whitish in colour against the ground colour of the mantle. 



Colour. — Ground coloui' of the mantle olive, with a pattern of irregu- 

 larl}'' placed spots or flecks of a darker colour sometimes present ; the 

 papillae as mentioned are whitish in colour, and a dark grey border runs 

 around the body close to the mantle border. The underside of the head 

 and foot are reddish-grey ; the boi-der of the mantle extends to the 

 underside and has the same depth of colour. 



Fositloii of ojteiiiiigs. — The anus is in the median line, while the 

 respiratory opening is close, but to the right of it. The male genital 

 opening is typical of the genus; the female genital opening is also typical 

 but Ijnng vei-y close to the anus. 



Aiiiitoni y. — Described by Sempei' and Plate. 



(jlrotiji character.- — Apjtendicular gland absent, but cartilaginous hooks 

 and tube are present in the penis. 



Localities. — Bi'isbane, Queensland (Sempei-, (Jodeffroy Museum) ; 

 Viti, South-western Pacific (Semper, Godeffioy Museum) ; South Seas 

 (Semper, Kiilliler) ; Noumea, New Caledonia (Australian Museum). 



The following species are described from the South-western Pacific. 

 No examples aie in the Australian Museum, and their anatomy has not 

 been elaborated by their authors or by subsequent workers. From the 

 figures and descrijitions, deficient as they ai-e in detail of a specific 

 character, comparison will be rendered difficult without access to, or a 

 re-description from the types. 



