242 Careinological Fauna of India. 



distal end of its upper border ; but tin's in the case of the last two pairs 

 is often reduced to a tubercle. 



The body and legs in this species are somewhat hairy and are more 

 or less encrusted with sponges, zoophytes, polyzoa, etc. 



In the Museum collection are specimens from the Arakan Coast, 

 Mergui, and Ceylon. 



Paramithrax (Chlorinoides) longispinus (de Haan). 



Maja (Chorinus) longispina, de Haan, Faun. Japon., Crust., p. 94, pi. xxiii. fig. 2. 

 Chorinus longispina, Adams and White, ' Samarang ' Crust. j p. 12. 

 Paramithrax (Chlorinoides) longispinus, Miers, Zoology H. M. S. ' Alert,' pp. 517 

 and 522. 



Chlorinoides longispinus, Miers, ' Challenger' Brachyura, p. 53. 



Chlorinoides longispinus, A. Ortmann, Zool. Jahrb. Syst., etc., VII. 1893, p. 53. 



This spceies differs from P. aculeatus in the following constant 

 characters : — 



(1) it is a much smaller species ; 



(2) all the spines, including the rostral spines, are elegantly 



knobbed at tip ; 



(3) in the median line of spines the third — the one on the cardiac 



region — is cleft transversely into two from the base; 



(4) the two oblique dentate ridges on the pterygostomian region 



are present, but the outermost tooth on the front ridge is 

 produced to form a long spine ; 



(5) the spine at the anterior angle of the supra-ocular hood is 



similar in size, form, and direction to the other large spines 

 of the carapace ; 



(6) the rostral spines are less than half the length of the cara- 



pace ; 



(7) the antero-external angle of the basal antennal joint is pro- 



duced to form, not a spine, but an elegantly curved folia- 

 ceous lobe ; 



(8) the meropodites of all the ambulatory legs have the terminal 



spine distinct and knobbed at the tip. 



This species commonly encrusts itself with a very regular plate- 

 armour of Orbitolites and rounded fragments of Nullipore, etc. 



In the Museum collection are good series from off Ceylon 33-34 

 fathoms, from the Andaman Sea down to 41 fathoms, and from the 

 Madras Coast. 



