236 Journal of the Asiatic Society of Bengal. [June, 1913. 
seems to be continuous with the dorsal renal sac. The mass is 
bent on itself antero-posteriorly so to form a bow-shaped body 
with the concave surface upward. The dorsal surface of the 
organs is connected with the floor of the pericardium, the heart 
lying in the concavity of the organs. 
e oviduct arises from the outer side of each ovary on 
the dorsal aspect at the junction of the anterior one-third and 
posterior two-thirds of its length. It passes outwards and 
downwards over the surface of the liver to the genital aperture 
placed at the base of the third peraeopod. 
The difference between the genital organs of the two genera 
may be tabulated as follows :— 
Typhlocaris. Palaemon. 
1. Testes ..| A single compact! ‘Two narrow elonga- 
a little in front of the ing from behind the 
er. tomach to the first 
| abdominal segment. 
2. Vas deferens The coils placed) The coils less close 
just behind the testes | and placed on the 
forming a compact outer side of the testes 
“mass. quite separate from it. 
3. Ovaries ., | The ovaries form a The ovaries are 
| Compact triangular elongated _ fusiform 
‘mass with the base bodies placed close to 
forwards. | each other. 
_ Nervous system. The nervous system of I'yphlocaris 
agrees closely with that of Palaemon except in a few details 
corresponding to the degenerate condition of the eyes. The 
differences may be noted in the following table :-— 
