TO INDIAN CAECINOLOGY. 417 



reach the middle of the hist antennal peduncular joint, and the antennal peduncles ai-e 

 about equal in length to the anteunular peduncles. 



The left chelipede has the merus more distinctly trigonal than usual, the upper border 

 heing rather thin and compressed, and armed with acute teeth, the most distal of Avhich 

 is most prominent. The carpus has a longitudinal row of pointed tubercles on its outer 

 surface, from four to seven in number, and of which one near the distal end is most 

 prominent ; between this row and the dentate inner margin, on which tliere are about 

 thirteen teeth, is a comparatively smooth and almost sulcate surface ; the remainder of 

 the outer surface is slightly tuberculate, and on the antero-external margin bounding 

 the carpo-propodal articulation are three well-marked spinose tubercles. The left 

 hand is slightly bent at an angle to the carpus, as in B. miles. The palm is covered 

 externally with small glabrous granules, which are most crowded along the lower 

 margin ; the outer surface is flattened, more especially on the lower half, and the 

 flattened portion is bounded proximally by a short ridge, which runs parallel to the 

 carpal articulation, and on which the granules are almost subspinose. The upper margin 

 of the hand and mobile finger is finely dentate. The ambulatory legs are comparatively 

 smooth, the most prominent spinules being seen on the carpi, and especially towards 

 their distal ends ; the dactyli are rather broad, and only about one third longer than the 

 propodi. The propodus of the second left leg presents glabrous tuberculiform elevations 

 on its upper margin. 



A female is 30 mm. long, the left chelipede (which cannot be fully straightened) is 

 18 mm. long, carpus mm., hand 11 mm. long and G mm. in height, dactylus 6'5 mm. 

 long ; second ambulatory leg 28 mm. long, its propodus 7 mm., and its dactylus 

 10'5 mm. 



This species is sufficiently characterized by the form of its ophthalmic process, the 

 flattened hand of the left chela, and the armature of the carpus. 



214!. Diogenes avartis, Heller. 



D. avarus, Heller, ' Novara ' Crust, p.' 83, Taf. vii. fig. 2 (1865). 



Tuticorin [Thurston); Ptameswaram, between tide-marks; Madras and Ennore, not 

 uncommon (J. B. S). 



This small species is easily recognized by its narrow elongated left chelipede, the 

 carpus of which is longer than the palm. The antero-lateral margins of the carapace 

 are either unarmed, or at most provided with nearly imperceptible spinules. The 

 ophthalmic process is narrow and entire, scarcely reaching the apices of the ophthalmic 

 scales. The ophthalmic scales are subentire, with merely a few marginal spinules 

 towards the apex. The antennal acicle is short and straight. 



The carpus and hand of the larger chela are finely granulated externally, and minutely 

 dentate along the upper margin. The hand is subcostate externally, the costa being 

 ill-defined ; the immobile finder is deflexed and not in the same straight line as the lower 

 margin of the hand. The ambulatory legs are smooth. 



