1899]. A. Alcock — Garcmological Fauna of India. 55 



Mus. V. 1883, p. 151 and Zool. Jahrb., Syat., VIII. 1894-95, p. 561 : Orfcmatm, Zool. 

 Jahrb., Sysfc., VII. 1893-94, p. 82 : J. R. Ilonderson, Trans. Linn. Soc. Zool., (2) V. 

 1893, p. 375. 



Ooniosoma orientale Heller (nee Dana), "No vara" Crust, p. 29, pi. iii. fig. 3 

 (sec, de Man). 



Differs from G. crucifera in the following particulars : — 



(1) the carapace is more convex, and the transverse lines are even 

 fainter, especially on the gastric region : 



(2) the frontal teeth are deeper-cnt and sharper (in adults) : 



( 3) the teeth of the antero-lateral borders are regular ; the first is 

 small and acute, the second is not much larger than the first, and the 

 last (in adults) is smaller than any of the three immediately in front 

 of it: 



(4) the major diameter of the orhit is only a fourth the width of the 

 inter-orbital space : the inner angle of the lower border of the orbit is 

 dentiform and strongly salient, and the lobule at the outer end of this 

 border is ill-defined : 



(5) the chelipeds are not much more than twice the length of 

 the carapace (in the male) ; the hand has 5 spines on the upper 

 surface, but two of them — those immediately behind the finger- joint — 

 are tubercles rather than spines ; the fingers of the larger cheliped are 

 as long as the palm, those of the smaller cheliped are longer than the 

 palm: 



(6) in the last pair of legs the merus is nearly twice as long as 

 broad and the posterior border of the propodite is serrated in a large 

 part of its extent : 



(7) the 6th abdominal tergum of the male is as long as or nearly as 

 long as broad and has its sides parallel in about three-fourths of their 

 extent. 



From Charyhdis quadrimaculata this species is distinguished by 

 the narrower carapace, by the smaller orbits and the different form of 

 the lower orbital border, and by the greater length of the 6th tergum 

 of the male abdomen. 



In the Indian Museum are 7 specimens from Karachi and 1 from 

 Bimlipatam, besides 1 from Penang. The carapace of the largest 

 specimen is 48 millim. long and 70 millim. in extreme breadth. 



Bub for high contrary authority, I should consider this species to 

 be identical with the Cancer sexdentatus of Herbst's pi. vii. fig. 52» 



32. Charyhdis ( Goniosoma) merguiensis, de Man. 



Ooniosoma merguiense, de Man, Journ. Linn. Soc, Zool., XXII. 1887-88, p. 82, 

 pi. V. fig. 3, 4, and Zool. Jahrb., Syst., 1894-95 p. 560. 



Goniosoma Helleri, Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 375. 



