442 
ZOOLOGY OF THE FAR EAST. 
Telson (pi. XVIII, fig. 17) entire, quadrangular in shape, almost parallel-sided^ 
distal margin truncate or perhaps faintly emarginate and armed with two feeble 
spiniform setae. 
Uropods (pi. XVIII, figs. 18-20) having the outer ramus shorter than the inner in 
the first two pairs and equal to the inner in the third pair. The peduncles succes- 
sively shorter in each pair and furnished with a few spines. The rami each with 
two or three spines. 
Length of the largest specimens, 6 mm. 
Nineteen species of the genus Monoculodes are at present known. The present 
species is distinguished from them all by the structure of the second and third 
thoracic limbs. The second thoracic limb especially forms a good distinguishing 
character. The sixth joint is longer and more oval in shape, and the carpal process 
of the fifth joint much longer and narrower than in any other species of the genus. 
The second thoracic limb, moreover, approaches the form of the third thoracic limb 
more closely in this species than in any other known to me. 
The occurrence of this typically arctic genus in fresh water in China is a 
matter of great surprise and interest. It is, moreover, the first record of any member 
of the family from waters other than strictly marine. Of the known species of the 
genus, one is known from the Gulf of Naples, one from deep water in the North 
Atlantic (Lat. 46° N.) and one from the American coast. The remaining species are 
distributed widely in the Arctic Ocean, some few extending to Norway and the 
Kattegat and to the British Isles. 
[This is the common aquatic amphipod of the Tai-Hu system, taken in shallow 
water (3-7 metres) on a muddy bottom both in the lake and in the river, N. A .] 
Family PONTOGENEIIDAE. 
Genus Atyloides, Stebbing. 
The new species described below is certainly congeneric with Atyloides gabrieli, 
Sayce, and A. foniana, Sayce, and for that reason I retain the generic name Atyloides. 
But I must confess that the validity of the genus is somewhat doubtful and I am not 
sure that a new genus ought not to be formed for the three freshwater species, leav- 
ing the marine forms to be distributed among one or other of the recognised genera in 
this family. 
The genus was originally established by Stebbing in his report on the Challenger 
Amphipoda. No definite type species is indicated but the definition of the genus is 
immediately followed by descriptions of A . australis (Miers), A . assimilis, Stebbing, 
and A, serraticauda, Stebbing, in that order. 
In 1906, Stebbing cancelled the first two species as s3^nonyms of Paramoera aust- 
nna (Bate). It seems to me that Atyloides thus becomes a direct synonym of Para- 
moera. In 1901 and 1902 Sayce described two freshwater species from Victoria, Austra- 
lia, A. gabrieli, and A. fontana and in 1906 these species with A. serraticauda, Stebbing, 
remained the only three species in the genus. Of these, the last named has been refer- 
red by Vanhoffen to the genus Leptamphopus in quite a separate family ! 
