ONClIlhllli V lU.'ETNAI.I-. 'M?> 



iHitclit'tl, mill in this luitcli (lir [laiiillii sdiiiils ii iiprnt I'ctt'd. 'I'lic |iii[)illii is 

 conical in sliape, and varies (o 4 mm. in liciglit. 'I'lie rcs[)initnry dpeniiifj; 

 in tlie median line is S mm. heliind tlie anal ))af>illa, and has llic I'oini of 

 ii peipcndiciiliir slit with I'onndetl, bnt not pi'oniinent lips. 



The female genital opening is situated on a small papilla lying at the 

 liead of tlie genital gi-oove ; in this species the groove is very conspicuous, 

 and may be easily followed as fai" as the frontal shield, where it turns 

 inwards to the pore of the foot gland situated behind the mouth. 



Aniitoiny. — Described and figured by Hergh ; histology of the dorsal 

 tubercles described by Semper and Plate. 



iiroiiji c/nirdcfor. — Anterior jjortion of the penis armed with cartil- 

 aginous hooks ; posterior portion soft, but with a cartilaginous element. 



LoralltieK. — Samoa, South-western I'acific (Semper, Godeffroy 

 Museum); Port Dorey, New (iuinea (Qno}- and Gaimard) ; Santa Cruz, 

 South-western Pacific (Austi'alian Museum, Coll. Jennings) ; Buccaneer 

 Group, Western Aii.sfi'alia (AustrjiJian Museum, Coll. Basedow). 



O.XCll I LI I U M M E l; I A K HI I , Shnil^r/t illsl,-//. 



OnchiiJi urn utpriatrii, Stantschinsky, Zool. Jahrb., Syst., xxv., 1907, p. 355, 

 taf. xii., figs. 1-3. 



E.i'tcnnd characters. — Form oval, back sti'ongly arched. Head small, 

 tentacles long, and conical. Hyponota smaller than the greatest width of 

 tlie foot sole. 



Average size: length 33 mm., breadth 19 mm., height 17 mm.; 

 greatest width of the foot sole, 13*5 mm. 



Mantle sculpture. — The mantle appears quite smooth to the naked eye, 

 but is densely covered with very small tubercles visible only with the aid 

 of a lens. Rather larger reti^acted eye papilhe are irregularly placed over 

 the mantle surface, a more conspicuous papilla occupying the centre of 

 the middle field. Each papilla bears from three to four eyes. 



Cohmr. — The ground colour of the mantle is olive, the middle field 

 being somewhat lighter; and this lighter ai"ea is bordered by two darkei- 

 lines. The edges of the mantle are darker in colour than the ground 

 colour, though the darker colour merges into the lighter, so that the 

 dai'ker ai^ea could not be recognised as a border. The underside is 

 i-egularly a light brown colour, with darker pigment spots placed iri'egu- 

 larly over the hyponota. 



Piisitio)/ of openings. — The anus is situated on an anal papilla, and is 

 not protected b}' the tail of the foot ; the respiratory opening in the 

 median line is close to the mantle borber. Male genital opening is typical 

 of the genus; female genital opening situated 15 mm. to the right of the 

 anal papilla. 



Anatomy. — Described and figured by Stantschinsky. 



Group character. — Appendicular gland and cartilaginous element 

 absent 



Locnlitij. — Queensland (type locality, Stantschinsky). 



