Preor Wy 
No. XVI.—A LIST OF THE FRESHWATER FISHES, BATRACHIANS, AND 
REPTILES OBTAINED BY Mr. J. STANLEY GARDINER’S EXPE- 
DITION TO THE INDIAN OCEAN. 
By G. A. Boutrnerr, F.R.S. 
(Communicated by J. Stantey Garpviner, M.A., F.R.S., F.L.S.) 
(Plate 40.) 
Read 7th May, 1908. 
Tue following list will give all the necessary data for the study of the distribution of 
the Lower Vertebrates inhabiting the Seychelles and Aldabra, as allusion has been made 
to the few species recorded by others but not obtained by the Expedition. As regards 
the Tortoises of Aldabra, no specimens of which were brought home by Mr. Gardiner, 
I am inclined to regard them as of one species only, Testwdo gigantea, to which I have 
made allusion, & propos of a young specimen given to Mr. Gardiner at Mahé. 
The extinct Crocodile of the Seychelles was probably Crocodilus niloticus, distributed 
over the greater part of Africa and Madagascar. 
FRESHWATER FISHES. 
1. Chanos salmoneus, Bl. 
Chagos Archipelago: Petit Coquillage, Peros Banhos. 
A widely distributed fish occurring in the sea as weil as in fresh water. I see no 
reason for regarding Ch. mossambicus, Peters, as a distinct species, although I have not 
been able to examine the type specimen. As to Ch. lubina, C. & V., which has been 
generally accepted, on the faith of Valenciennes’s description, as a valid species, I am 
informed by Dr. Pellegrin, who has kindly examined the types at my request, that the 
fin-formula (D. 19, A. 15) as originally given is incorrect. The specimen from Bourou 
(Quoy et Gaimard) has D. 16, A.11; that from Mauritius (Dussumier) has D. 15, A. 10; 
whilst the three from the Seychelles (Dussumier) have D. 14-15, A. 10-11. There is 
therefore no doubt that Ch. lubina is also a synonym of Ch. salmoneus, the only reason 
for separating it being the supposed difference in the number of dorsal and anal rays. 
2. Anguilla virescens, Peters. 
Praslin. 
Freshwaters of East Africa, breeding in the sea. 
4,0* 
