380 A, Alcock— Carcinological Fauna of India. [No. 3, 



behind the branchial groove, are, in both sexes, three granular eminences, 

 one behind the other, the last being on the posterior border. The 

 lateral borders are convergent : their true first tooth, which in other 

 species is at once the anterolateral angle of the carapace and the outer 

 angle of the orbit, appears in this species to belong to the upper border 

 of the orbit, so that the anterolateral angle of the carapace is formed by 

 the much larger second tooth which also is the apparent outer orbital angle. 



The least breadth of the front, between the eyestalks, is about an 

 eighth the greatest breadth of the carapace : its free edge is very 

 obscurely bilobed. 



Orbits sinuous and oblique: the upper border microscopically 

 beaded and furnished near its outer end with a sharp recurved tooth, 

 which is really the outer orbital angle, though the apparent angle is the 

 much larger tooth of the lateral border of the carapace : the lower 

 orbital border is finely denticulated in its inner two-thirds, but is 

 broken and indistinct beyond this. Eyestalks long, slender, curved : 

 the eyes reach not only beyond the true limits of the orbit, but also 

 beyond the anterolateral angle of the carapace. 



The external maxillipeds do not quite meet across the buccal 

 cavern : the suture between the ischium and nierus is decidedly oblique. 



The legs and chelipeds have the same general proportions as in 

 M. pectinipes, but the legs are unarmed. 



In the male chelipeds the anterior border of the arm is hairy and 

 strongly denticulated, but there is no " musical ridge : " the inner angle 

 of the wrist and the proximal part of the upper border of the palm are 

 also denticulated. On the outer surface of the palm there is a crest 

 running close to, and parallel with, the lower border ; and on the inner 

 surface of the palm, near the middle line, is a longitudinal row of 

 denticles the first one of which is considerably enlarged : the surface 

 above this ridge, as also the inner surface of the fingers, is densely 

 hairy. The dactylus is not nearly two-thirds the length of the palm : 

 the immobile finger, but not the dactylus, has a strong molariform tooth 

 at its basal end. 



In the female the chelipeds are short and weak as usual, and the 

 hand is quite smooth and has the borders — but specially the lower 

 border — thin and sharp. 



In the Indian Museum are a male and a female from the Andamans : 

 the carapace of the male is 9 millim. long and 24 millim. broad. 



73. Macrophthalmus depressus^ Riipp. 



Macroplithalmus depressus, Ruppell, 24 Krabben Roth. Meer. p. 19, pi. iv. fig. 6, 

 pi, vi, fig. 13 : Milne Edwards, Hist. Nat. Crust. II. 60, and Ann, Sci, Nat. Zool. (3) 



