Pleurobmiichcea.] GASTROPODA. 553 



rounded at the two ends, and projecting beyond the mantle behind. 

 Veil continuous with the mantle, wide, arcuate, crenulated, and ter- 

 minating in 2 points ; surmounted behind by the 2 short auriform 

 tentacles. Gill fusiform, free at the end, formed of parallel and oblique 

 foliations, generally uncovered. Verge almost always projecting, large, 

 and 9-11 mm. long. Anus opens above and past the middle of the 

 gill. Mouth at the end of a small rostrum. 



Type in the Mus. Hist. Nat., Paris. 



Hob. The type is from Port Western, Australia. It is said that 

 in 1843 Belligny and Laucan each found one specimen on the shores 

 of New Zealand. Also Juan Fernandez Island. 



I have not seen this species. 



2. Pleurobranchasa novae-zealandiae, C'hee.seman. 1878. Plate 36, 

 fie. 2. 



*& 



Pleurobranchcea novce-zealandice, C'hsm., P.Z.S., 1878, 276, pi. 15, f. 3 : 

 T.N.Z.I., xi, 1878 (1879), 378, pi. 16, f. 3 : M.N.Z.M., 124 : Vayssiere, 

 Ann. Sci. Nat,, Zool., viii, 338, pi. 1.5, f. 28 : Bergh, Reise Philipp., v, 

 1898, 150, 154 : Zool. Jahrb. Syst., xiii, 1900, 208, pi. 20, f. 56, 57 ; 

 pi. 21, f. 69. 



Body oval, convex, thick and fleshy, smooth and lubricous to the 

 touch, but the whole surface nevertheless covered with minute puckers 

 and folds. Colour light grey, copiously streaked with irregular anas- 

 tomosing lines of dark greyish-brown, and sprinkled with numerous 

 minute and almost microscopic white dots. Mantle smooth, not 

 nearly so long as the foot, and not concealing the branchiae, rather 

 broader on the right side ; oral veil broad, extending over and con- 

 cealing the mouth, in front semicircular, and with a delicate fringed 

 margin, but on each side produced into the short auriform tentacles. 

 Mouth large, round, in a state of rest concealed in the sulcus between 

 the veil and the foot, but capable of being greatly protruded. The 

 rhinophores wide apart, short and stout, projecting outwards, folded 

 down the outer side, tips obliquely truncate. Eyes minute, black, 

 immersed in the integument at the inner bases of the tentacles. Foot 

 long, extremely flexible, sole pale ashy-grey. Branchial plume often 

 over 25 mm. in length, the posterior half free ; leaflets about 17, 

 finely ciliated. Length, 65-80 mm. Jaws two, large, finely and regu- 

 larly reticulated or faceted, the plates mostly consisting of hexagonal 

 prisms. Teeth of radula numerous, acuminate, with a single slender 

 cusp on the main tooth. 



Type?.). 



Hob. Auckland Harbour, type (T. F. Cheeseman) ; Shelly Beach 

 and St. Helier's (H. S.) ; Akaroa Harbour (Schauinsland, H. S.) ; 

 on sandy flats, not uncommon in the winter and spring months ; 

 Wellington Harbour (Hutton). 



