564 GASTROPODA. [Opisthobrnnchia. 



Length, 23 mm. ; breadth. 16 mm. ; height, 10 mm. 

 Hob. Kaikoura, one specimen (Professor Benharn). 

 Remark. This form is probably identical with one of the recently 

 described species of the genus. (Bergh.) 



Subgen. 2. HOMOIODORIS, Bergh, 1882. 



Homoiodoris, Bergh, Verhandl. Zool. Bot. Gesellsch. Wien, xxxi, 1882, 222. 

 Type : H. japonica, Bergh. 



The characters are those of Archidoris. differing only in the genitalia, 

 the prostatic gland being large and the vagina armed. 



4. Doris novae-zealandiae, Bergh, 1904. 



Homoiodoris novoe-zealandice, Bergh, Semper's Reise Philipp., Malac. Unters., 

 vi, 1904, 35, pi. 3, f. 3-7 ; Benham. T.N.Z.I., xxxvii, 317 ; Eliot, 

 P. Mai. S., vii, 328. 



Animal having the form of Archidorids ; consistency somewhat 

 stiff. The colour of the back is whitish or faintly yellowish-white ; 

 the tubercles white ; the head and foot inclining to yellowish ; the 

 clubs of the rhinophores and the gill are chrome-yellow ;' one individual 

 had the under-surface of the mantle-edge spotted with violet-grey. 

 The back is covered pretty closely with tubercles of dissimilar size, 

 somewhat flattened on the apex (at least in the case of the larger ones) ; 

 they attain a height and diameter of about J mm. Similar tubercles 

 are also present at the edge of the rhinophore-pits and gill-aperture. 

 The club of the rhinophore bears about 20 folia? ; the branchial aperture 

 is transversely oval ; the gills number 5 or 6 ; the cylindrical anal 

 papilla is relatively high (1 mm.). The under-surface of the mantle- 

 flap is smooth ; the sides of the body angular. The foot has a distinct 

 groove at its anterior edge ; the tail is short. Tentacles short, thick, 

 with grooves on the under-side. 



Dimensions of specimens preserved in alcohol : Length, varying 

 from 12 mm. to 20 mm. Largest specimen : Breadth, 13 mm. ; height, 

 7 mm. : width of mantle-flap. 3-5 mm. Length of foot. 16 mm. ; 

 breadth, 7 mm. 



Hal. Port Chalmers (Professor Benham). 



Remarks. Whether this form belongs to the genus Homoiodoris 

 remains for the present undecided, since the most essential character 

 the armature of the vagina was not established. It may belong to 

 the genus Artachcea, Bergh (Syst. Nudibranch. Gastropoda, 1892, 

 1093), or a new genus will have to be formed. 



Subgen. 3. CTENODORIS, Eliot, 1907. 



Ctenodoris, Eliot, P. Mai. Soc., vii, Sept, 1907, 338. Type : C. pecten, Eliot. 



These forms have the ordinary characteristics of the Archidori- 



didce. The back is tuberculate, the teeth simply hamate, and there 



is no armature on the labial cuticle or genitalia. But the structure 



