234 Journal of the Asiatic Society of Bengal. (June, 1913. 
| 
Typhlocaris. — Palaemon. 
| 
| 
} 
cast NSS ear ee eer sian lease 
. The liver is elongated, and ‘The liver is less elongated, 
extends from behind the and does not extend beyond 
oesophagus beneath the the cephalothorax. 
endosternite to the first 
abdominal segment. 
. There is around hump-like The hump is less prominent. 
prominence on the dorsa 
aspect situated above the 
attachments of the second — 
and third peraeopods. 
—_ 
bo 
3. Behind the hump, the liver The liver slopes backwards and 
extends to the first abdo- =a _ little downwards behind 
minalsegment inthe form — the hump and terminates In 
of a prominent beak-like a blunt end with a median 
process, being separated § groove on the postero-ven- 
| tral aspect. 
dle-shaped concavity on 
the dorsal aspect. 
In both genera the intestine presents a bulbous swelling 
just before it ends in the anus. 
Vascular system, The pericardiumis triangular in shape, 
being a little narrower than that of Palaemon. It occupies 4 
little less than the posterior half of the cephalothorax, while in 
Palaemon it extends over a little more than the posterior third 
of the length. 
The heart occupies the middle of the pericardial chamber. 
The dorsal surface presents a ridge in the middle line. The 
the sides. There seem to be two pairs of ostea, both placed on 
the dorsal surface of the heart. These correspond to the 
the lateral wall of the pericardi 
