248 Journal of the Asiatic Society of Bengal. {June, 1913. 
chief functions are to clean the other appendages, including the 
swimmerets, and to convey food to the mouth. Occasionally 
the animal moves forwards through the water by means of the 
swimmerets alone, the fore parts then being raised higher than 
the abdomen. It was not, however, observed to approach the 
species of Palaemon. The manceuvre is executed in the usual 
manner, that is to say by suddenly bending the telson towards 
the base of the thorax. 
So long as the prawn is moving either backwards or forwards, 
the claws are held with the basal segments projecting out from 
the body almost at right angles, but with the carpus and chela 
directed forwards. They have the appearance of protecting 
the anterior part of the body and tosome extent feeling the way. 
The chief part in testing the surface in forward progression is, 
however, played by the outer maxillipeds (pl. XII, fig. 2), with 
which Typhlocaris constantly taps the ground, as does Palaemon. 
The antenna is, as a rule, held directed outwards and often con- 
siderably upwards, while the rami of the antennules are spread 
out so as to cover as large an area as possible. At periods, 
when the animal is at rest, they are held still, but, as a rule, 
they are infrequent motion. It was observed that a movement 
in the water near the prawn sometimes, but not always, caused 
it to dart away. 
Typhlocaris is evidently timid in disposition and, unless en- 
Potamon or Discognathus attacks it. Several of the specimens 
obtained, however, have lost and were regenerating various 
3. 
Y Means: of ite first peraeopods and devour them; but 
tected 
No observations were made whi i 2 
: ch cast any light on the 
— of the sutures in the carapace ; but Btn note that 
t Pere saepets fits tightly round the bases of the legs and thus 
probably assists in respiration by keeping mud from entering 
