Bbnham. — Nu'iibranch Molluscs Jrom New Zealand. 319 



back and a widish mantle-flap, with tri- or quadri-pinnate 

 gills, small tentacles, and rather stout foot. The oral disc 

 (Lippen-scheibe) is unarmed ; the radula has a narrow naked 

 rhachis, and numerous hook-like plates. Within this large 

 family of Dorids it approaches most nearly the genus Archi- 

 doris. It shows well the short finger-shaped tentacles and the 

 relatively small number of gills. The penis and vagina are both 

 unarmed. Apparently the only peculiarity about the animal 

 is the dorsal keel, and it must for the present remain doubtful 

 whether Gray was justified in founding a new genus on this 

 character alone. 



Atagema carinata (Q. and G.). Doris carinata, Q. and G., Voy. 

 de l'Astrolabe, ii., p. 254, pi. 16., figs. 14-16. Atagema 

 carinata, Gray, fig. iv.. p. 104. [Bergh figures it] pi. in., 

 figs. 8-11. 



An individual of this species lies before me, obtained by 

 Dr. Benham from Dusky Sound, at the south-west corner of the 

 South Island. The living animal is pure-white. The sketch 

 made by Benham (fig. 8) is from an individual preserved in 

 formol. 



[I exhibited a specimen of this Dorid at a meeting of the 

 Otago Institute in 1898,* and drew attention to the fact that 

 it was the " D. carinata " of Quoy and Gaimard. Since sending 

 the specimen to Dr. Bergh, I have received from Mr. R. Henry, 

 at Dusky Sound, others of a larger size — viz., length, 8-9 cm. ; 

 breadth, 6-7 cm. ; height, 3*3 cm.] 



The specimen in alcohol is much arched, contracted, and 

 hardened ; it had been broken. It is now yellowish-white in 

 colour. 



[Dimensions (p. 40).] The length was [in an extended con- 

 dition] probably 5-6 cm., with a breadth of 4 cm., and a height 

 2*5 cm. The dorsal keel has at its greatest length a breadth of 

 5-7 mm. ; it is narrower in front and behind, while posteriorly 

 to the protuberance its height is 5 mm. The width of the 

 mantle-flap is at least 12 mm., and its thickness at the base 

 is 7 mm. ; the height of the rhinophore-sheath is 4 mm., and of 

 the branchial papilla 4 mm. ; the breadth of the foot is 22 mm., 

 and of the margin of the foot 4 mm. 



[Externals.] The consistency is leathery ; the back is quite 

 finely shagreened. The form is oval, with a somewhat arched 

 back ; the mantle-flap broad, and the foot projecting all round. 

 The back carries a great median keel, which commences 

 anteriorly between the rhinophores. It is at first somewhat 

 low and narrow, then becomes thicker, and behind the middle 



* See Trans. N.Z. Inst., xxxi., p. 743. 



