‘ 
1922. ] Indian Bopyridae. 71 
like Ss Saat aed Thomson and Slegias Richardson by the 
possession of triramous pleopods, is known from a single 
peels parasitic on Alpheid collected at Waltair and 
the Andamans. The other new genus allied to Pleurocrypia 
Hesse, is also known from a single species, se 
es, whi 
on a single specimen parasitic on a Synalpheus collected in 
Ross Channel, Port Blair, Andam 
The distribution in Indian pata of the genera Probopy- 
rus and Palaegyge presents a very interesting feature. All the 
species of these two genera occurring in Malay sia are said to 
be exclusively freshwater forms and are met with fairly far 
inlan One species of Probopyrus has been captured even at 
high altitudes. On the other hand the Indian species of these 
genera, though occurring for the most part in waters which 
ome c 
captured in places where the water is slightly brackish. Thus 
it is seen that the two genera which are exclusively fluviatile 
in the Malay Archipelago, are deltaic in the Indian waters. 
Dr. Annandale informs me that the same thing is observable 
which live exclusively in salt water in the west migrate more 
and more up stream as they proceed eastwards. As an instance 
might be cited the case of “boandee This genus is orolunvely 
marine in Europe; in India some of the forms ascen r 
Palaemon; while in Japan the common freshwater prawn is a 
species of Leander. The same is observable in the Molluscan 
genus Modiola. It is marine in Europe; in India it is mostly 
marine but some species ascend up stream an come estuar- 
ine; while in China the genus is met with in the inland lake 
system 
Another interesting point in connection with distribution 
is the marked resemblance that the Bopyrid fauna of the Indo- 
pacific region shows to that of the Atlantic coast of North 
America. A number of genera are common to the two regions, 
and some of the species even show close affinity. 
POPPA OLIN PR RIB LOE IOI 
