Doris.] GASTROPODA. 565 



of the branchial apparatus is remarkable : not only are the plumes 

 simply pinnate, as in Staurodoris, but they are arranged in a line or 

 crescent, and the upper lip of the pocket shuts down over them like a 

 single valve. 



Only two species are known the type, which is from the Malclive 

 Archipelago, and the New Zealand form. 



5. Doris flabellifera, Cheeseman, 1881. Plate 37, fig. 2. 



Doris (?) flabellifera, Chsm., T.N.Z.I., xiii, 1880 (1881), 222; Eliot, 

 P. Mai. S., vii, 1907, 328, 339. 



The bad- is covered with low inconspicuous warts of various sizes. 

 The edges of the rhinophorial pockets are not protected by distinct 

 tubercles, and only slightly 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 cre- 

 scent 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 branchia? extends 

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

 being the largest, and lying just above the anal papilla. There are 

 22 plum.es in all, but varying from 18 to 26. The foot is rather small, 

 grooved, but not notched in front. The large buccal mass is (in spirit 

 specimens) protruded ; on either side of it is a flat tentacular fold 

 with traces of a groove. Colour pale yellowish-orange, sometimes 

 sprinkled with a few minute blackish specks. Mantle-spicules very 

 numerous, straight or slightly bent, thickest in the middle, and taper- 

 ing gradually to the extremities. The eyes are sessile and rather large. 



Length, 21 mm. ; breadth, 13 mm. ; height, 5 mm. Foot, 12 mm. 

 long and 7 mm. broad. The mantle-margin is ample, and in places 

 as much as 5 mm. broad. 



There is no armature on the labial cuticle. The radula consists 

 of 35 to 40 rows, with a formula of about 50 + 0+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 contains small gastropod shells. 



Further anatomical details are to be found in Sir Charles Eliot's 

 paper. 



Hnb. Not uncommon between tide-marks in Auckland Harbour, 

 feeding on sponges and corallines (T. F. Cheeseman) ; Snares (Pro- 

 fessor C. Chilton). 



