1912. ] N. ANNANDALE: Fauna Symbiotica Indica, 4. 247 
attached to the base of the pharynx. ‘The intestine is rather longer 
and much more bulky than the pharynx; it is indistinctly saccu- 
lated at its anterior end. 
Genitalia.—Only the penis need be described here. ‘The 
chitinous part of this organ (fig. 1) consists of three regions :— 
(1) a proximal, funnel-shaped base, (2) an elongate cylindrical 
stem and (3) a cup-shaped apex. The basal funnel occupies about 
1 of the length of the whole structure and has a perfectly smooth 
external surface; it is almost twice as long as its basal diameter. 
The stem is about 34 times as long as its own transverse diameter, 
maintains the same diameter throughout its length, is circular in 
cross-section and occupies ? of the whole structure. It is orna- 
mented externally with minute rounded prominences with which 
it is closely covered, the prominences forming parallel transverse 
rings round it. The terminal cup is about 1} times as long as 
broad and only about 75 the length of the stem. Its sides, which 
are nearly parallel, are supported by four equidistant vertical bars, 
each of which is about equal in breadth to the space which sepa- 
rates it from the next bar. At the rim of the cup the bars project 
upwards for a short distance, their tips being bluntly rounded.' 
Excretory system.—A pore which I believe to be excretory is 
situated on each side of the body close to the edge of the dorsal 
surface and a little posterior to the eye. These pores are easily 
seen in living specimens. 
Eggs.—The eggs are nearly circular as seen from the side but 
broadly oval as seen from above. Each is provided with a stalk 
considerably shorter than its own diameter. They are somewhat 
variable in size but measure on an average about 0°24 Xo'r9g mm. 
in dorsal view. ‘The external covering is chitinous but very thin 
an‘l quite smooth ; it has a distinct yellowish tinge. 
Type (a specimen mounted in glycerine) No. Z.E.V. °°*°, Ind. 
Mus. 
Localties, etc.—River Mahanaddi and canal opening thereinto 
at Cuttack and R. Mahanaddi at Sambalpur, Orissa (February 
and March); river Ganges near Rajmehal, Bengal (March) (B. L. 
Chaudhuri). 
Hosts.—Caridina propinqua, de Man (4) and C. sumatrensis, 
Bouvier (3). 
II.— BIOLOGICAL. 
The first specimens of Caridinicola were found attached to 
antennae of prawns of the genus Caridina taken at Cuttack in 
February and preserved in spirit. Others were discovered loose 
in the same bottle. They were, naturally enough, mistaken for 
small leeches by my assistant who was sorting out the contents of 
the bottle. As the species was evidently one of considerable 
interest, I took the opportunity to revisit Cuttack last March 
and found the worm abundant in the gill-chambets of C. propinqua, 
1 These details can only be seen with the a:d of an oil-immersion lens after 
the specimen has been treated with caustic potash. 
