216 



The exopodite of the external maxillipecls ends in a flagellum. 



The thoracic legs of the 1st pair, which are chelate and massive, may be 

 either equal or very unequal : those of the 2nd and 3rd pairs are long, and those 

 of the 4th and 5th pairs very short. 



Paired appendages are never present on all the abdominal somites. 



The gills are occasionally modified trichobranchia?, but are usually phyllo- 

 branchiae. 



Synopsis of the genera of Pagurida? of the Indian Benthos and Oligobenthos. 



I. The first two abdominal somites of the male have each a pair of append- 

 ages : — 



1. The first abdominal somite of the female is destitute of 



appendages : the exopodite of the 1st masillipeds is a 

 falcate-foliaceous plate without flagellum : the clielipeds 

 are remarkably unequal : the gills, which are modified 

 trichobranchia 1 , are 11 on either side : — 



i. Eyestalks long and slender, eyes small : gill-fila- 

 ments quadriserial ... ... ... Parapagdrus. 



ii. Eyestalks stout, eyes large : gill-filaments biserial Sympagurus. 



2. The first abdominal somite of the female has a pair of 



appendages : the exopodite of the 1st maxillipeds ends 

 in a flagellum : the chelipeds are subequal or equal. In 

 the female the abdomen is furnished on one side with a 

 fleshy lobe that assists in forming a brood- pouch : — 



i. Tail-fan asymmetrical : eyestalks long and slender : 

 4th pair of thoracic legs nou-chelate : gills 14 

 on either side — phyllobranchire ... ... Paguristes. 



ii. Tail-fan symmetrical : eyestalks stout : the 4th 

 pair of thoracic legs are perfect chelas : gills 13 

 on either side — modified phyllobranchia?. The 

 animal lives, not in a shell, but under a port- 

 able blanket formed by the coenosarc of a 

 colony of sea-anemones ... ... Chl^nopaguru 



II. The first two abdominal somites of the male, and the first abdominal 

 somite of the female, are destitute of appendages : the vas deferens 



of the male protrudes, as a short curved tube, from the coxa of the 



5th right thoracic leg. Gills as in Parapagurus. Eyestalks stout, 



not elongate ... ... ... ... ... Pagurodes. 



Parapagurus, S. I. Smith. 



Parapagurus, S. I. Smith, Trans. Connect. Acad. V. 1878-82 (1879), p. 50, and Bull. Mns. Corap. Zool. X. 

 1382-83, p. 20 : Henderson, Challenger Anomura, p. 85 : A. Milne Edwards and Bouvier, Mem. Mns. Comp. Zool. 

 XIV. 1S93, No. 3, p. 26, and " Hirondelle " Crust. Brachyures et Anomures (Monaco, 189i), p. 63 : Stebbing, South 

 African Crast., 1900, p. 27. 



Body markedly asymmetrical. Carapace larger than the abdomen, strongly 



