105 



II. 



Key to the Indian genera of the family MacruridEe. 



Snout projecting beyond the moutli : rays of tlie anal fin better 

 developed than those of the second dorsal : gill-rakers on the outer 

 side of the first branchial arch tuberculiform 



Snout not projecting beyond the mouth : rays of the second dorsal 

 fin better developed than those of the anal : gill-rakers on the outer 

 side of the first branchial arch long and setiform 



Maceurds, 



Bathygadus. 



Maceurds, Blocli, Gi'mtlier. 



Mncrurus, Giintlier, Challenger Ueep-Sea Fishes, pp. 122-121. 



Macrurus, Coelorhynchus, Coryphaenoides, Hymenocephalus, Lionurus, Trachonwus, Cetonurus, Chnlliiura, 

 Optonnrus, Malacoceplialus, Nematonurus, Moseleya, Aiyssicola, Goods and Bean, Oceanic Ichthyology, pp. 390-417. 



Malacocephalus, Moseleya, Nemafonurus, Albatrossia, Bogoslovius, Chalinura, Coryphaenoides, Hymenocephalus, 

 Macrourus, Coelorhynchus, Trachonurus, Lionurus, Jordan and Evermann, Pishes N. America, pp. 2569-2.592. 



Head short and thick with the muciferous cavities well developed ; tail long 

 and tapering. 



The snout usually projects well beyond the mouth, which may be either 

 quite inferior or lateral and subterminal. Teeth in the jaws only. A barbel at 

 the symphysis of the lower jaw. 



Gill-openings wide, the gill-membranes slightly united in front. The first 

 branchial arch is broadly connected by membrane with the outer wall of the gill- 

 chamber, so that the slit between that arch and the gill-cover is very much 

 narrower than the other branchial clefts. The gill-rakers on the outer side of the 

 first branchial arch are mere scabrous tubercles. 



Scales either strongly and typically ctenoid or, more rarely, cycloid. No 

 scaleless fossa on the side of the nape. 



Second dorsal fin separated from the first by an interval ; its rays, or at least 

 its anterior rays, are more or less rudimentary. Anal rays much better develop- 

 ed than those of the second dorsal. Ventrals arising below, or slightly in 

 advance of, the pectorals. 



Key to the Indian subgenera of Macrurus (adapted from Dr. Giinther). 



I. Villiform teeth in bands in both jaws : scales imbricate and spini- 

 gei'ous : — 



1. Dorsal spine serrated : mouth inferior 



2. Dorsal spine smooth : — 



i. Mouth inferior ; the infraorbital region divided 

 into a vertical and a subhorizontal portion by a 

 longitudinal ridge 

 ii. Mouth wide, in the ordinary lateral position 

 II. Teeth in two series in the upper jaw and in a single series in the 

 lower jaw. [Dorsal spine smooth : mouth lateral: scales imbricate 

 and spiuigerous] ... .„ ,,, 



14 



Macrdkos. 



coeloiiuynchus. 

 Mystaconorus, 



JJalacocephalos. 



