(>N('IIIhlll>.K ItRKI NAI.I,. 811 



Position i)f openiui/f!. — 'The anus is situated on a small papilla, ami is 

 eutii'ely covered by the tail of tlie foot ; tlie respiratory opening is in the 

 median line close to the mantle border. Male genital opening situated to 

 the right and inside the riglit tentacle and close to its base. Fennile 

 genital opening t^'pical of the genus. 



Aiidtoiiiij. — Partly described l)y Semper and I'late. 



(iiiinp clmincler. — Anterioi" poi'tion of the penis with hooks, posterior 

 l)itr(ion soft and without cartilaginous element. 



LoCdlily. — Ponape, South-western Pacific (Plate). 



ONCitllMlTM (JlilSKlM, riiilr. 



(hiriih'inii iiriseuiii, Plate, Zool. Jahrb , Anat., vii., 18!>.'>, p. 179. 



E.vtennil r/ntrin-Jers. — Body elongate oval, equally rounded anteriorly 

 and posteriorly; back rounded but not sti-ongly arched. Head large, 

 tentacles long. llyponolii slojjing, and smaller than the greatest width of 

 the foot sole. 



Average size: Length 275 mm., breadth *J0 mm., lieight It! mm. 

 Greatest width of the foot sole 17 mm. 



iLudle scalyture. — The mantle is thickly covered with granules and 

 papilhc. The jiapilla' are regularly one mm. in height, Avith flattened tops ; 

 and around these from five to eight granules are arranged. The granules 

 var^' in size, but they are always smaller than the papilla^. Some papilla- 

 carry from one to three eyes and these ai"e lighter in colour than the 

 gronnd colour of the mantle. 



Colour. — The ground colour of the mantle is regularly- a greyish white, 

 while the points of the papillae, as mentioned above, are conspiculously 

 lighter in colour. The foot and uudersui'face are light and rather yellowish 

 in colour. 



Position of npeiiiinjf. — The anal papilla is not pi'otected by the tail of 

 the foot; the x-espiratory opening in the median line is close to the mantle 

 border. Male and female genital openings typical of the genus. 



Anatomy. — Described by Plate. 



Group character.- — ^Au appendicular glaud present, but cartilagim)us 

 element absent from the penis. 



Locality. — Polynesia (Plate). 



OxcHiDiDM PEKONii, Cuvier. 



Uncliiiliuiii pcronii, Cuvier, An. Mus. Nat. Hist. Paris, v., 1804, p. 38, pi. 

 vi., tigs. 1-9. /(/., Le Regne Animal, 3rd ed., 1836-49, p. 69 (f.n.). 

 hi., Mem. a I'Hist at a 1' Anat. Moll., xiii., 1817, p. 1, pi. i., tigs. 1-9. /(/., 

 Ferussac, Tabl. Syst. Moll., 1821, pt. 2, p. 6. Id., Lamarck, Hist, 

 nat. An. sans Vert., 1st ed., vi., 1822 (2), p. 46. LI., Deshayes, 2nd. ed., 

 vii., 1836, p. 709. LI, Krauss, Siidafr. Moll., 1848, p. 72. LL, 

 Semper, Heis. im. Arch. Phil., iii., Landmoll., v., 1880, pp. 258 and 260. 

 LI, Connolly, Ann. S.Afr. Mus., xi., 3, 1912, p. 224. LL, Gray, Fig. 

 Moll. Anim., iv., 1850, p. 117. Id., Quoy and Gaimard, Voy. "Uiunie" 

 et "Ph^-sicienne", Zool., 1824, p. 428. 



