Aphelodoris.] GASTROPODA. 575 



KEY TO SPECIES. 



A. Dorsum whitish mottled with brown, or entirely brown : 



branchia' 5-6, contracted, tripinnate . . . . affinis. 



B. Dorsum flesh-brown, with reddish- brown spots ; branchia 3 5, 



rarely 6, the two hindmost deeply cleft, forming an incom- 

 plete circle, bi- or tri-pinnate . . . . . . . . Cheesemani. 



C. Dorsum purplish ; branchia; 6, tripinnate . . . . purpurea. 



1. Aphelodoris affinis, Eliot, 1907. 



Aphelodoris affinis, Eliot, P. Mai. S., vii, Sept. 1907, 343. 



The animal is shaped somewhat as Chromodoris : the sides are 

 high and the mantle-edge small. The colour is dirty - white with 

 irregular mottlings of dark reddish-brown. The epidermis peels off 

 very readily, and it is possible that the brown mottlings may have 

 been much more extensive, or even that the dorsal surface may have 

 been wholly brown. It is quite smooth, and presents no trace of 

 warts or granulations. The foot is large, and the anterior margin is 

 not grooved. The oral tentacles are white, large, flat, and distinctly 

 grooved. The rhinopho'res are purplish-brown, and provided with 

 sheaths 1-5 mm. high. The rim of the branchial pocket is flattened 

 as preserved, but was probably raised in life. The bmnchice are 

 purplish-brown, but the outside of the stem is whitish ; they are 

 tripinnate, much contracted, and apparently consist of 5 or 6 plumes, 

 the division in one place not being clear. (Eliot.) 



Length, 14 mm. ; breadth, 8 mm. ; height. 8 mm. 



The labial cuticle is darker in some places than in others, but 

 presents nothing that can be called a labial armature. The formula 

 of the radula is about 23 x 60 + 0+60. The innermost teeth have 

 long bases and lower hooks than the rest. The teeth increase in size 

 up to the middle of the half-row, where they are large, simply hamate, 

 and rather erect. Towards the end of the half-row they decrease in 

 size, and have low strongly bent irregular hooks, but are not denti- 

 culate. No spines or other armature could be found in the genitalia. 

 (Eliot.) 



Some other internal organs are described by Sir Charles Eliot. 



Hob. Great Barrier Island, one specimen (C. Cooper). 



2. Aphelodoris Cheesemani, Eliot, 1907. Plate 37, fig. 4. 



Aphelodoris Cheesemani, Eliot, P. Mai. S., vii, 1907, 342. Doris luctuosa, 

 Cheeseman, T.N.Z.I., xiv, 1881 (1882), 213. ? Archidoris varia, Abrah. : 

 Basedow and Hedley, T.R.S. S.Aust., xxix, 1905, 150, pi. 5, f. 1-5. 



Body oblong or linear-oblong, back moderately rounded. Mantle 

 small, rather narrow and hardly concealing the sides of the foot, 

 smooth and soft to the touch, not granulate, of a dirty flesh-brown 

 more or less spotted or streaked with reddish-brown ; occasionally 

 dirty-white with a few reddish-brown markings ; towards the sides 



