fe sony] 
No. XVIII.—AMPHIPODA GAMMARIDEA FROM THE INDIAN OCEAN, 
BRITISH EAST AFRICA, AND THE RED SEA. 
By Au¥FrReD O. Waker, F.Z.S., F.Z.8. 
(Plates 42 & 43.) 
Read 19th March, 1908. 
Tue three collections of Amphipoda treated of in this memoir are as follows :— 
I. By Mr. J. Stanley Gardiner, F.L.S., during the voyage of H.M.S. Sealark in 1905. 
II. By Mr. C. Crossland at Zanzibar and Wasin, British East Africa, in 1901-2. 
III. By the same gentleman in the Red Sea, from October 1904 to May 1905. 
The number of species in each collection is as follows :— 
I. 32, of which 19 are not in either of the other collections. 
If. 23, of which 6 are not in either of the other collections. Of this number 14 were taken at 
Wasin in mud 10 fath. ! 
III. 20, of which 6 are not in either of the other collections. 
The total number of species in the 3 collections is 50 in 36 genera. Of these 7 are 
new, Viz. :— 
Ichnopus serricrus. 
Stegocephalus globosus. 
Chagosia (g. n.) gardineri. 
Eusiroides diplonyx. 
Lembos leptocheirus. 
Eurystheus monuropus. 
Amphithoé lobata. 
Another species which I had described under the name of Hlasmopus ctenonyx has 
just been published by M. Chevreux in ‘ Bulletin du Muséum d'Histoire Naturelle,’ 
1907, No. 6, p. 412, under the name of Z. spinidactylus, from the Gambier or Paumotu 
Archipelago, halfway between Australia and South America. Both names refer to the 
peculiar comb-like structure of the dactyli of the perzeopods. 
As regards Geographical Distribution :— 
19 species have been found on the Ceylon coasts. 
9 3) Sea 6s »» in the Maldives. 
2 ae er » in the Pacific and Australasia, including 4 in the Paumotu Archi- 
pelago not yet published. 
Sess pei, F5 > in the Mediterranean. 
a tets ere » inthe N. Atlantic. 
44* 
