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or part serrated, runs from the posterior border to the cervical groove, and 

 thence inclines towards the base of the rostrum : the 3rd, or " dorso-lateral " 

 crest, runs from the posterior border to the cervical groove, and either ends 

 there or is continued on to the orbital spine : the 4th, or " lateral " crest, runs from 

 the posterior border to the cervical groove, and thence is continued, along the 

 hepatic region, either to a point between the orbital and branchiostegal spines, 

 or to the branchiostegal spine itself. 



The abdomen is more or less distinctly carinated in the middle line, the 

 carinae behind the first somite being broken. 



Eyes globular, very large, generally dark purple in spirit specimens. 

 The branchial formula is as follows : 



Total 



(2 ep.} 



= 11 + 2 ep. 



Key to the species of Glyphocrangon of the Indian Benthos. 



I. The 3rd or " dorso-lateral " crest of the carapace is present behind the 

 cervical groove only : 



1. The anterior half of the 4th or " lateral " crest ends in a huge, 



vertically-compressed wing-like spine, the tip of which 

 projects beyond the anterior border of the carapace between 

 the orbital and branchiostegal spines : 



i. Free portion of rostrum about two-thirds the length 

 of the rest of the carapace measured in the middle 

 line : the 3rd or " dorso-lateral " crest does not 

 end acutely : the 2nd pair of thoracic legs are at 

 least as long as those behind them ... 

 ii. Free portion of rostrum more than two-thirds the 

 length of the carapace : the 3rd or " dorso-lateral " 

 crest ends in a spine : the 2nd pair of thoracic legs 

 are decidedly shorter than those behind them 



2. The anterior half of the " lateral " crest ends in a small spine 



which falls far short of the anterior border of the 



carapace : 



i. 2nd or " subdorsal " crest sharply serrated in all its 

 course : anterior half of 4th or " lateral " crest 

 cut into two teeth : median carinffi of 2nd and 3rd 

 abdominal terga prominent ... ... G. priononota 



G. investigatoris. 



G. Smithii. 



