ELIOT : NUDlBKANCn« OF NEW ZEALAND. 339 



Ctenodoeis flabellifera (Cheeseman). 



Doris flabellifera, Cheeseman : Trans. New Zealand Institute, vol. xiii, 

 p. 222/I88O. 



Three specimens marked ^^ Doris flahellif era, Hauraki." Two are of 

 a uniform yellowish white. One has two irregular rows of brown 

 spots. The largest specimen is 21 mm. long, 13 broad, and 5 high ; 

 the foot is 12 mm. long and 7 broad. The mantle-margin is ample, 

 and in places as much as 5 mm. broad. 



The back is covered with low inconspicuous warts of various sizes. 

 The edges of the rhinophorial pockets are not protected by distinct 

 tubercles and only t-lightly raised. The rhinophores are large and 

 stout. The branchial pocket is bilobed. The upper and anterior 

 valve or flap is bow-shaped ; the posterior valve is somewhat more 

 rounded, and the two enclose a fairly wide space shaped like a crescent, 

 with the ends pointing forward. The pocket is very shallow, and is 

 not protected by any special tubercles ; its membranous floor is raised 

 in a dome-like elevation. From either corner of the anterior valve 

 a nearly straight row of thin, simply pinnate branchiae extends 

 towards the middle, slightly increasing in size, the two median 

 jjlumes being the largest and lying just above the anal papilla. There 

 are 22 plumes in all. The foot is rather small, grooved, but not 

 notched in front. The large buccal mass is protruded ; on either side 

 of it is a flat tentacular fold with traces of a groove. 



The central nervous system is strongly granulated, and the ganglia 

 are not distinctly separated. The eyes are sessile and rather large. 

 No armature was found on the labial cuticle. The radula consists of 

 40 rows (of which three are rudimentary) with a formula of about 

 50 . . 50. The teeth are white, strongly hamate, not denticulate, 

 and with long bases. There is no median tooth, but the first laterals 

 project into the rhachis one behind the other. The inner teeth, 

 particularly the first 6-7, are smaller than the rest. Then the size 

 goes on increasing until almost the end of the row. The last three, 

 especially the outermost of all, are smaller, but not much degraded and 

 not denticulate. 



The stomach is entirely outside the liver and is lamellated longi- 

 tudinally inside. It contains gastropod shells, one 1*5 mm. long. 

 The hepatic mass is whitish externally, pinkish within. The genitalia 

 are small and undeveloped, but appear to be of the type usual in 

 Staurodoris. No hooks or spines were found, but the vagina bears 

 strong zigzag folds. The verge is conical, but somewhat bent at 

 ; the tip. 



- 



RosTANGA MUSCULA (Abraham). PI. XXVIII, Fig. 3. 



'i Boris muscula, Abraham : Proc. Zool. Soc, p. 256, pi. xxix, figs. 6-7, 



' 1877. 



* Rostanga pulchra, MacFarland : U.S. Bull, of Bureau of Fisheries, 



vol. XXV, p. 119, 1905. Cheeseman: Trans. Inst. New Zeal., 



vol. xiii, p. 222, 1880. 



