LAHILLE: NOTA SOBRE EL CHENOGASTER HOLMBERGI. 473 



Body oblong, compressed, uovered all over with large cycloid 

 scales. Head with the upper profile a.rched, parabolic, compressed 

 above into a ridge. Cleft of the mouth of modérate width, hori- 

 zontal, armed with teeth of modérate size; teth of the palatines, 

 none ou the vomer. Eye hiteral, rather smalL None of the opér- 

 eles serrated. The anterior dorsal fin is continuous, formed by nu- 

 merous slender spines. The soft dorsal and anal consista of an an- 

 terior lobe, followed by seven or eight finlets. Pectoral and ventral 

 fins rather short. Caudal bilobed ; tail with two keels at the base 

 of the caudal. Pj'loric appendages dendritic. 



Lepidothynnus Huttonii n. sp. (Pl. vi. figs. A. A'). 



B.7. D. 17 / t / Til A Ü / VIII L. lat. 78-80. L. transv. G / 

 13 (below 2 nd dorsal). 



The body is broadest in front of the pectoral fin, the de^Dth of 

 this portion being aboiit two-sevenths of the total length (without 

 caudal). The head is nearly as deep as long, compressed into a 

 crest, the small eye occnpying a position in the middle of the depth 

 of the head, but nearer to the end of the mouth than to the hind 

 margin of the operculum. The cleft of the mouth is subhorizontal; 

 extending backwards to below the middle of the eye. (tÍU covers 

 bread and firm as in Tunnies. 



The body is covered with large cycloid scales (fig. a), somewhat 

 broader than long, 1 Va inches broad. The lateral line follows the 

 line of the back, after having made a curved ascent above the pec- 

 toral fin. 



The spinous dorsal commences above the gilí opeuing, is low and 

 long, and formed by seventeen slender spines. It is rather widely 

 separates from the soft dorsal, whose anterior connected rays form 

 a short fálcate lobe; seven detached finlets follow. The anal corres- 

 ponds in position and form to the soft dorsal. These vertical fins 

 can be completely concealed in fissures onthe back and abdomen. 



Pectoral fin short and powerful as in a short-finned Tunny; 

 ventral short, its root opposite to that of the pectoral fin. 



Colour uniform steel-grey, lighter below; caudal fin and inside 

 of the pectoral darker. 



Prof. Hutton has taken the foUowing measurements : 



