1886.] NEW PEDICULATE FISH. 139 



millim. 

 Breadth of the head across the jaws 16 



,, „ across the base of the orbital spine . . 10 



Length of the body to the commencement of the second 



dorsal 26 



Base line of the second dorsal 6 



Depth of the root of the tail 4*5 



Diameter of the eye 2"5 



Length of the cephahc tentacle (first dorsal) ... 9 



Length of the guttural tentacle 23 



Length of the caudal fin 14"5 



l^ength of the pectorals (with the pseudobrachium) ...... 5 



Length from the snout to the pectorals (to the root of pseudo- 



brachia) 16 



The structure of the bodi/ in its natural state can hardly be 

 correctly described from this specimen, in which the whole of the 

 belly exhibits an abnormal distension in consequence of the fish 

 having swallowed a Scopeloid fish, the total length of which is one ' 

 half longer than itself. 



The head is very large, with an enormous mouth and long teeth. 

 The body itself is short and slender, compressed, and with the heavy 

 dependent abdominal cavity, of which the hindermost part extends 

 far beyond the end of the vertebral column. 



The greatest depth of the body is at the back of the head, and is 

 precisely the same as the length of the head. The body itself is 

 apparently much lower, and the root of the tail narrow and low. 



A thick cephalic spine is to be found on the snout ; and under 

 the throat a long tentacle divided at the end, which undoubtedly is 

 phosphorescent, as well as the end of the cephalic spine. 



The gill-openings are so narrow that they can only be distinguished 

 with difficulty ; their openings are not much larger than the head 

 of a pin. 



The head. — Its appearance when viewed from the front is nearly 

 tetrahedral, somewhat compressed, and broadest downwards. Its 

 greatest width is across the angle of the mouth, and is about equal 

 to the length of the intermaxillary bones. Tiie upper profile of 

 the head exhibits a somewhat projecting and slightly outwardly 

 inclined spine above each eye. The breadth of the head across the 

 base of these spines (which form the up{)er corners of the square 

 when the head is seen from the front) is one third less than the breadth 

 across the angles of the mouth (or the lower corners of tlie square). 



The forehead in front of the orbital spines is concave, with a deep 

 furrow leading to the end of the snout, bounded on each side by a 

 ridge, on which also the orbital spines are projecting ; the concavity 

 is somewhat broader downwards than it is above. 



There are altogether three spines on each side of the head. One 

 orbital spine is directed upwards and slightly forwards. One spine 

 at the back of the operculum is directed backwards ; also a small 

 spine at the back of the lower jaw sloping inwards and downwards ; 



10* 



