55 



2. Carpus of second pair of thoracic legs subdivided into 2 or 

 many segments : 



i. First pair of thoracic legs very robustly chelatt 1 , of 



unequal size ... ... ... ... ALPHEII 



ii. First pair of legs robust, subchelate ... ... 



iii. First pair of legs sler.der, apparently mono- 

 dactylous ... ... ... 



II. The thoracic legs, or at least the first four pairs, have ezopodites : 

 carpus of the second pair unsegmented, simple : 



1. The thoracic legs are slender, and of enormous length, the 



first four pairs have smnll exopodiles ... ... NEMATOCARCT 



2. The thoracic legs are of no extraordinary length, all five pairs 



have large exopodites : 



i. The exopodites of the 2nd inaxillipeds are large ... Hoi'LOPHORiD-E. 



ii. The exopodites of the 2nd mnxiliipeds are rudimen- 

 tary or absent ... ... ... 



The following table is meant to illustrate my own views as to the natur:il 

 inter-relations of the Canilca of the Indian Necton and Benthos. 



Alliance I. PASIPHVEOIDA. Mandibles with a simple serrated edge, with or 

 without palp. Exopodites of 1st maxillipeds with a broad foliaceous Hagrllmn. 

 The last segment of the 2nd inaxillipeds is a typical dactylus articulating end -on 

 with the propodite, as in 1'i'iH'it*. All the thoracic legs have large exopod 

 but the exopodites of the 2nd maxillipeds are rudimentary or absent. The first 

 two pairs of thoracic legs are the longest and stoutest and end in elongate well- 

 formed chelae, the 2nd pair having a simple carpus. 



This alliance includes the genera that constitute the single family 

 Pasiplisdd%. Of these genera the only one that might perhaps be .separated ti> 

 form a distinct family within the alliance is Psathyroearis, 



Alliance II. HOVLOI-HOUOIDA, including the single family 7/</-/..yi//<,-/'/.-t. 

 Mandibles with incisor and molar processes distinct but almost confluent; with 

 a stout incurved palp. The last segment of the 2nd maxillipeds may (Epli ////</") 

 be an almost typical dactylus, but usually it lies obliquely along the distal part 

 of the inner border of the propodite as if it were a complement;)! pietv of that 

 joint. The exopodites of the 1st maxillipeds have the form of a simple falcate 

 leaf without a flagellum. All eight pairs of thoracic appendages have well 

 developed exopodites. The first two pairs of thoracic legs end in slender well 

 formed chelae, the 2nd pair having a simple carpus. 



In this alliance Epluii-in marks the point of connexion with the r<usij)lwi,l;i-. 



Alliance III. PANDALOIDA, including the two families I'nmLilidx and 

 Nematocarcinidx. Mandibles deeply cleft into two well formed well calcified 

 branches an incisor and a molar and having a stout incurved palp. The 



