1912. | N. ANNANDALE: Fauna Symbiotica Indica, 4. 251 
The eyes probably serve another purpose. As the worm sits 
in the gill-chamber of its host, they are, as I have already stated, 
directed straight in front of it. The current of water that flows 
constantly through the gillchamber must bring in many of the 
little organisms on which Caridinicola feeds, and it is reasonable 
to assume that it catches these organisms by means of its protru- 
sible pharynx. In order to do so, however, it must first become 
aware of their presence. There is every probability that it does 
so by seeing them, for the walls of the gill-chamber of Caridina 
propinqua are of glassy transparency and offer hardly any obstacle 
to the passage of light, while even those of C. swmatrensts, although 
they are as a rule much more densely pigmented, are by no means 
opaque. 
SUMMARY. 
1. The new genus Caridinicola constitutes with Scutariella, 
Mrazek, a family of ‘‘’Temnocephaloidea ’’ of which the latter is 
the type. 
2. The family Scutariellidae is distinguished from other fami- 
lies of the group, among other characters, by the fact that the 
intestine extends to the posterior end of the body and that the 
genital organs, therefore, lie on its ventral surface instead of poste- 
rior to it. 
3. Caridinicola is distinguished from Scutariella by the pos- 
session of a pair of small anterior suckers, by the terminal posi- 
tion of the mouth and by the peculiar shape of the posterior 
sucker. 
4. Cartdinicola indica is found only in association with cer- 
tain species of the Atyid genus Caridina, namely C. propinqua. 
de Man, and C. sumatrensis, Bouvier. 
5. It captures its prey by means of a protrusible pharynx or 
oesophagus. 
6. Its tentacles are sense-organs and are apparently em- 
ployed in testing the nature of the surface along which the animal 
is moving and also in finding the host. 
7. ‘Ihe eyes are probably used for the detection of prey. 
8. Progression is affected by ‘‘ looping.” 
In conclusion I must again express my indebtedness to 
Mr. Gravely and also to Mr. Stanley Kemp, who has given me 
great assistance in identifying the hosts of Caridinicola indica. 
LITERATURE. 
I. Annandale .. ‘* Some recent Advances in our know- 
ledge of the Freshwater Fauna of 
India,’’ Journ. As. Soc. Bengal, 
LOL2, 9930), Dia Ue ene 
