1904.] ox NUDIBRANCHS FROM EAST AFRICA AXD ZANZIBAR. 83 



such other Agamids as, for example, Amphibolarus barhatus (also 

 exhibited). If the specimen exhibited by me be not a mere 

 variation, I can understand how it is that the presence of femoral 

 pores has been asserted by some and denied by Gray. For there 

 are along the thigh a few larger scales which might lead to the 

 inference that they were perforated scales. They are not so, 

 however ; and when the skin is reflected no glands can be seen ; 

 these always accompany the femoral pores, which are, of course, 

 the external'apertures of their ducts. 



Mr. Oldfield Thomas, F.R.S., F.Z.S., exhibited, on behalf of the 

 President, a sketch by a Chinese artist of a hind and fawn of 

 Pere David's Deer {Elaphurus davidianus) from Hainan. Unfor- 

 tunately the artist had added the antlers of a Peking Stag {Cervus 

 hortuloritm). The sketch was taken from specimens presented to 

 Mr. E. T. C. Werner, H.B.M. Consul at Hainan. It served to 

 prove that P6re David's Deer still survived in Hainan. Whether, 

 however, it was indigenous or imported, remained to be deter- 

 mined. ^ Mr. Lydekker was in communication with Mr. Werner on 

 the subject. 



The following papers were read : — 



1. On some Nudibrancbs from East Africa and Zanzibar. 

 Part V.^ By Sir C. Eliot, K.C.M.O., late H.M. Com- 

 missioner for the East African Protectorate, F.Z.S. 



[Received March 10, 1904.] 



(Plates III. k lY. t) 



In my last two papers I treated of the Doi-ididse Crypto- 

 branchiatse as a group, but no systematic importance is to be 

 attached to the order in which the species now to be described are 

 arranged. 



Pteraeolidia semperi. — Since writing my description of this 

 species in my second paper (P. Z. S. March 17, 1903, p. 255), I have 

 read Prof. Bergh's account of Nossis, characterised by a lateral ridge 

 similar to that found in some of my specimens (' Opisthobranchiata 

 of Danish Expedition to Siam,' 1899-1900, p. 52), and accordingly 

 carefully re-examined them to see if they should not be referred 

 to this new genus. It appears that they should not. The radula 

 is uniseriate, consistently of 18 teeth, and the same in the 

 specimens which have and those which have not the lateral ridge. 

 It therefore seems clear that the ridge is found in the genera 

 where the radula is uniseriate as well as in those where it is 

 triseriate, and, further, that in alcoholic specimens, at any rate, it 

 may be present or absent in the same species. 



* For Part IV. see P. Z. S. 1904, vol. i. p. 380. 

 t Vox- explanation of the Plates, see p. 105. 



6* 



