A. Alcock — Carcinological Fauna of India. 
159 
1895.] 
The classification proposed in this paper is in many respects a 
reversion to the older authors. 
For a most interesting and instructive historical and critical review 
of the Oxyrhyncha as a whole, I would refer to the Introduction of 
Miers’ paper, already cited, in the Journal of the Linnaean Society, 
Zoology, Vol. XIY. 1879, pp. 634-642. 
I have only to add that as almost all the new species described in 
this paper have been dredged by the ‘ Investigator,’ they will be 
figured in next year’s issue of the “ Illustrations of the Zoology of the 
‘ Investigator.’ ” 
Tribe OXYRHYNCHA or MAIOIDEA. 
Oxyrinques, Oxyrinchi , Latr. Hist. Nat. Crust, et Insect, tom. VI. p. 85. 
Oxyrhinques et Canceriens Cryptopodes, Milne-Edwards, Hist. Nat. Crust, tom. I. 
pp. 263, 368. 
Maioidea or Oxyrhyncha, Dana, U. S. Expl. Exp. Crust. Pt. I. pp. 66, 67 and 75. 
Oxyrhyncha, Miers, Journ. Linn. Soc., Zool., Vol. XIV. 1879, p. 634; and 
4 Challenger’ Brachyura, p. 2. 
Carapace more or less narrowed in front, and usually produced to 
form a rostrum : branchial regions considerably developed, hepatic 
regions small. Epistome usually large ; buccal cavity quadrate, with 
the anterior margin usually straight. Branchiae almost always nine in 
number on either side*: their efferent channels open at the sides of 
the endostome or palate. Antennules longitudinally folded. The 
palp of the external maxillipeds is articulated either at the summit or 
at the antero-internal angle of the meropodite. The external genitalia 
of the male are inserted at the bases of the fifth pair of trunk-legs. 
The Oxyrhyncha may be sub-divided into two families, namely :— 
(J) the Maiidse, in which the basal joint of the antennae is well 
developed, and in which it is exceptional to find the chelipeds vastly 
longer than the other legs ; 
and (2) the Parthenopidse , in which the basal joint of the antennae 
is very small, and is embedded between the front and the floor of the 
orbit; and in which it is exceptional not to find the chelipeds vastly 
longer and vastly more massive than the other legs. 
* Encephaloides is the only Oxyrhynch known to me in which the branchiae are 
less than nine in number on either side : in Encephaloides the reduction, both in 
size and number, of the anterior bran chi® seems to be due to the enormous 
development of the four posterior branchiae. 
