Farran — Seventh Report on the Fishes' of the Irish A tlantic Slope. 113 



Lionurus aequalis (Giinther). 



Dfacrums aequalis, Giinther (1878, 1887), Holt and Caklerwood (1895), 

 Collett (1896, 1905), Koehler (1896), Holt and Byrne (1910), 

 Zugniayer (1911), Mnrray and Hjort (1912). 



Macmrus smiliophorus, Vaillant (1888). 



Macrurus serratiis, Roule (1919). 



Liomirus aequalis, Gilbert and Hiibbs (1916). 



' (Plate VII, %. 5.) 



Fig. 6. — Lionurus aequalis (after Holt and Calderwood). 



Description. — Head moderately compressed. Snout projecting conieally 

 beyond the mouth, the cleft of which extends almost to below the centre of 

 the eye. Head, including the underside, completely covered with small 

 spinulose scales. A well-marked sub-orbital ridge terminates posteriorly at 

 the anterior margin of* the preopercular, and is continued forwards in a 

 straight line, as a lateral rostral ridge, to the tip of the snout. The scutes 

 forming this ridge are in a double series below the eye. The median rostral 

 and pre-iiasal ridges are indicated by low keels, but are not marked by any 

 differentiation of the scales. There is a small bifid rostral tubercle, and a 

 low nasal tubercle, marked with slightly enlarged spinules, is situated on the 

 anterior end of the sub-orbital ridge. Inter-orbital space flat, or slightly 

 convex, variable in width within the limits of one-fourth to one-fifth of the 

 length of the head. Eye large, slightly longer than high, its greatest 

 diameter being parallel to the sub-orbital ridge, and measuring -So to -4 of 

 the length of the head. 



Posterior margin of pre-opercular forming a right angle with the long 

 axis of the head (from the tip of the snout to the upper posterior angle of 



