332 



l)r. Chr. Liitken on Oneirodes Eschrichtii, 



fore (fig. 1), its physiognomy is very peculiar. The head is 

 quadrangular, with a broad, sloping, frontal surface, which is 

 hollowed out by a broad and deep furrow, and bounded at the 

 sides by an incurved wall, which projects strongly behind and 

 above on each side in an acute frontal spine, and anteriorly 

 and beneath, on each side of the apex of the snout, runs out 

 into a double tubercle (probably, to judge from LopMus, be- 

 longing to the palatal bones). No other tubercles or spines 

 besides those here enumerated occur upon the head, except 

 that the rami of the lower jaw run out into a little spine on 



Fig. 1. 



Head of Ofieirodes Eschrichtii, seen from the front, three fourths nat. size. 



each side. Immediately over the rostral tubercles a small 

 nasal papilla may be observed on each side*. 



The total length of the fish, from the snout to the apex of 

 the tail, is 205 millims. (or about 8 inches, more than double 

 that of Melanocetus Johnsonii) ^ to the base of the caudal fin 

 160 millims. ; the greatest depth, which will about coincide 

 with a line dropped from the isolated soft dorsal ray, to which 

 we shall refer further on, over the point of attachment of the 

 pectoral fin to the ventral margin, is about 105 millims., con- 

 sequently fully half the total length. The thickness, measured 

 between the two frontal spines, is 45 millims., and between 

 the angles of the mouth about 55 millims., consequently ap- 

 * This occurs also in Ceratias. 



