1900.] A. Alcock— Carcinological Fauna of India. 287 



Subfamily IV. Rhizopine (Rhizopinse Miers, Ortmann). With 

 the exception of one species (Notonyx nitidus) the eyestalks are fixed, 

 and very often the " cornea " is minute or obsolete : the lower border of 

 the orbit has a tendency to rnn downwards towards the epistome. The 

 carapace usnally has its antero-lateral corners cut away and rounded 

 off : the front may be square-cut and broad, but is more often narrow 

 and more or less distinctly bilobed and deflexed. The antennules may 

 be of fair size and transversely folded, but more often, owing to the 

 narrowness of the front, they are cramped, and fold obliquely : some- 

 times they cannot be folded in their fossae at all. Antennal flagella 

 usually short. The epistome may either be well defined and prominent, 

 or ill defined and sunken. The buccal cavern may be squarish, but it 

 often is decreased in breadth anteriorly : the external maxillipeds have 

 a square merus and may completely close the buccal cavern, or there 

 may be a gap between them. The male abdomen does not nearly cover 

 the space between the last pair of ambulatory legs. Mqje openings 

 sternal. 



Subfamily V. Hexapodim: (Pinnoteridse-Hexapodinse Miers, 

 Ortmann). Only three pairs of legs besides the chelipeds, the last segment 

 of the sternum also aborted. Carapace much broader than long with the 

 antero-lateral corners cut away and rounded off. Front narrow : eyes, 

 orbits and antenna? small : the antennules fold transversely. Epistome 

 well defined : buccal cavern with the sides a little anteriorly- convergent, 

 or not, nearly closed by the external maxillipeds, whose merus is either 

 quadrate or has the antero-external angle rounded off. The male abdo- 

 men does not nearly fill the space between the last pair of ambulatory 

 legs. Male openings sternal. 



Family PINNOTERID^, Edw. 



Pinnotheridse, De Haan (part), Faun. Japon., Crust., pp. 5/34. 



Pinnotheriens, Milne Edwards (part), Hist. Nat. Crust. II. 28. 



Pinnotherinx, Milne Edwards, Ann. Sci. Nat. Zool. (3) XVIII. 1852, p. 138, and 

 XX. 1853, p. 216 : Dana, U. S. Expl. Exp., Crust, pt. I. pp. 378, 379 : Miers, 

 Challenger Brachyura, p. 274: Ortmann, Zool. Jahrb., Syst., VII. 1893-94, p. 691 ; 

 and in Bronn's Thier Reich, torn. cit. p. 1177. 



I propose, with some diffidence, as I have not examined enough of 

 the forms included, to divide this family into 4 subfamilies : — 



Subfamily I. Pinnoterjn^. Ischium of the external maxillipeds 

 either rudimentary, or indistinguishably fused with the merus to form a 

 single piece which is usually oblique, sometimes transverse. Usually 

 the carapace is not transverse and the palp of the external maxillipeds 

 not so large as the merus-ischium. 

 J. ii. 38 



