346 Carcinological Fauna of India. 



Nat. Sci. Philad. 1880, p. 179 : Miers, Ann. Mag. Nat. Hist. (5) X. 1882, pp. 378, 

 379: C. W. S. Aurivillins, Zur. Biol. Amphib. Decap., p. 17 (Mitg. K. Ges. Wiss. 

 Upsala, 1893). 



Ortmann, Zool. Jahrb., Syst. X. 1897-98, pp. 360, 364 {uhi synon.). 



Carapace square, its greatest bi*eadth, wliicli is about a tentli more 

 than its gi^eatest length, is at the acuminated antero-lateral angles, 

 ■which coincide -witli the outer orbital angles and are right angles, or 

 nearly so. 



The borders of the cai'apace, with the exception of the posterior 

 border, are elegantly beaded or serrulate, and the lateral borders in 

 their anterior third are stiaight and parallel, or nearly so. 



The cardiac region can be distinguislied, and the anterior ends of 

 the cervical groove are pi'esent on either side of the gastric region. 



Upper border of orbit sinuous and a little oblique, so that the outer 

 angle of the orbit is considerably behind the front : the lower border 

 has an obscure notch near its middle, but there is no gap at its outer 

 angle. The eyestalk is prolonged beyond the eye into a blunt-pointed 

 style of variable length. 



The lateral borders of the buccal cavern, though their general 

 direction is slightly convergent anteriorly, nave a distinct ontward 

 curve. The merus and ischium of the external niaxillipeds have their 

 exposed surface circumscribed by a raised row of granules, •which is 

 deficient only at the basal attachment of tlie ischium. 



Chelipeds and legs scabrous, the asperities having in many places 

 a tendency to a rngiform or squamiform arrangement, and almost form- 

 ing serrations on the borders of some of the joints, and becoming spines 

 or teeth on the lower borders of the arms and hands and at both angles 

 of the Aviist — especially at the inner angle Avheie theie is always at 

 least one distinct spine. 



The stridulating organ of the larger palm is of good length (much 

 more than half the greatest breadth of the palm) and is some little 

 distance from the immobile finger, a thick strip of hair intervening : in 

 its upper half it consists of tubercles giadually passing to stri», in its 

 lower half it consists of a comb of fine regular and very close-set stiia;. 

 It plays against a polished ridge that i uns across the upper part of the 

 inner surface of the ischium. 



The palms and fingers of both hands — but notably of the smaller 

 hand — are compressed, and the fingers of both hands are pointed. 



The first three pairs of legs have the merus bi^oadened : they do not 



differ greatly in length, and the 2nd pair, which are slightly the longest, 



ai'e about two-and-a-half times the greatest length of the carapace 



The fourth (last) pair aic a good deal shortened — reaching only a little 



688 



