258 A. Alcock— Carcinological Fauna of India. [No. 2, 
Parthenopinea, Miers, Journ. Linn. Soc., Zool., Vol. XIV. p. 641; and ‘ Challen¬ 
ger ’ Brachyura, p. 91. 
The eyes are usually retractile within small circular well-defined 
orbits, the floor of which is nearly continued to the front, leaving a 
hiatus which is usually filled by the second joint of the antennary ped¬ 
uncle. The basal antennal joint is small, and is deeply imbedded 
between the inner angle of the orbit and the antennulary fossae. 
The antennules fold a little obliquely. 
The Parthenopidse are divided by Miers into two sub-families, 
namely:— 
Sub-family I. Parthenopinse ; in which the carapace is sometimes 
sub-pentagonal or ovate-pentagonal, more commonly equilaterally-tri¬ 
angular, and sometimes almost semi-circular or semi-elliptical in out¬ 
line ; in which the cardiac and gastric regions are usually so deeply 
marked off from the branchial regions on either side as to make the 
dorsal surface of the carapace trilobed; in which the chelipeds are 
vastly longer and more massive than the ambulatory legs ; and in which 
the rostrum is either simple or obscurely trilobed. 
Sub-family II. Fumedoninas ; in which the carapace is, commonly, 
sharply pentagonal, with the junction of the antero-lateral and postero¬ 
lateral borders strongly produced; in which the cardiac and gastric 
regions are not conspicuously marked off from the branchial regions ; 
and in which the chelipeds are of moderate size. 
Sub-family I. PARTHENOPINiE, Miers. 
Miers, Journ. Linn. Soc., Zool., Yol. XIY. 1879, p. 668. 
Key to the Indian genera. 
I. Carapace not laterally expanded :— 
1. Basal antennal joint very short, not nearly 
reaching the inner canthus of the orbit: 
fingers of chelipeds very strongly incurved... Lambrus. 
2. Basal antennal joint nearly reaching the inner 
canthus of the orbit: fingers slightly incur¬ 
ved . Parthenope. 
II. Carapace more or less expanded to form a vault in which 
the ambulatory legs are concealed :— 
1. Carapace transversely triangular; greatly 
expanded both laterally and posteriorly. Cryptopodia. 
2. Carapace transversely triangular; expanded 
laterally, but not posteriorly : a ridge on the 
pterygostoinian region. Heterocrypta. 
