Amphipoda with notes on a species of Isopoda. . 445 
teeth, instead of three, on the distal margin of the inner lobe of the maxillipedes. 
It differs from A. gahvieli in these points and in addition in the number of setae on 
the inner lobe of the first maxilla and in the less expanded form of the second joint 
of the palp of the mandible. 
All three species are freshwater and found in mountainous streams at good 
altitudes, Sayce's species in Victoria, Australia, the present species in Japan. It is 
a matter of great interest to note the curious distribution of these three species^ 
which, however, finds its parallel among Crustacea in the genus Paratya among the 
Macrura. Whether the three species of Atyloides here dealt with are congeneric with 
the marine species referred to that genus is a point which I am. unable to decide. 
On the sternum of certain of the thoracic somites of both specimens I found 
a number of finger-like processes. As far as I c an make out these processes are 
present on the third to the seventh somites and there may be one or two pairs, 
symmetrically arranged, on each somite. I am quite unable to suggest what these 
processes are or what their function may be, but they suggest the similar processes 
found by Sars in Gammams pulex and Pontoporeia affinis, by Smith in Pontoporeia 
hoyi and by Shoemaker (1920) in Synurella johanseni. 
It is probable, too, that the processes found by Chilton in Gammarus barrington- 
ensis are of the same nature. They are quite distinct from the accessory branchial 
vesicles which I have described below in G. annandalei , which are definitely addi- 
tional processes on the outside of the branchial lamellae themselves. 
Family GAMMARIDAE. 
Genus Gammarus, Fabricius. 
Gammarus annandalei, n. sp. 
[PI. XX, figs. 1-18.] 
Localities. — China. 
1. Off Si Dong Ding, Tai-Hu, io-xii-15, ten specimens, 5-7 mm. 
2. Outskirts of Shanghai, in ditches and small ponds, ly-ix-is, five specimens, 
4-3 mm, 
Japan. 
Lake Biwa. 
1. Station 5, off Komatsu, on west side of lake, 74 metres, firm mud, i-x-15, 
twenty-one specimens. 
2. Station 6, off Komatsu, nearer the shore than station 5, 53 metres, soft mud 
mixed with shells and small pebbles, i-x-15, ten specimens. 
3. Station 8, in the centre of the lake near White Rocks, 77 metres, mud with 
fragments of shell, about fifty specimens. (Types.) 
4. Station 12, two specimens from a depth of 190-200 feet in Lake Biwa. 
5. Station 13, shore at Chikubushima, on lower surface of stones, four young, 
2-X-15. 
