PORBEAGLE. 517 



obtusely pointed, with a band of punctures on each side of 

 the forehead terminating above the eyes, a few similar punc- 

 tures behind the eyes, and a triangular patch of them before 

 the nostrils ; they are the apertures of canals filled with a 

 transparent jelly : eyes round, dark blue ; branchial slits five, 

 cut across the neck, the posterior oblique and close to the 

 pectoral fin ; back rounded ; dorsal fin triangular, with a free 

 pointed pale-coloured process behind ; posterior dorsal fin 

 also pointed posteriorly ; pectorals somewhat triangular, 

 obliquely sinuate on the posterior edge, black ; ventral fins 

 rhomboidal, meeting at the mesial line, on which are the 

 anal and generative apertures ; anal fin small, pointed be- 

 hind ; tail lunate, with unequal lobes, the superior and larg- 

 est with a projecting outline near the tip ; above the tail 

 there is a flat space bounded by a short transverse ridge, and 

 a similar one opposite on the ventral side : lateral line 

 straight ; the keel on the body runs forward on the tail, and 

 there is a small keel beneath this confined to the tail itself. 

 The length along the lateral line, five feet eight inches and a 

 half; circumference in front of the dorsal fin, two feet eight 

 inches and a half ; from the snout to the eye four inches and 

 three-quarters ; diameter of the eye, one inch and one-tenth : 

 breadth between the eyes, five inches and one-quarter ; from 

 the snout to the margin of the upper lip, four inches and a 

 half, thence to the angle of the mouth also four inches and a 

 half; breadth of the mouth from angle to angle, eight inches 

 and one-quarter ; snout to dorsal fin, two feet one inch and 

 three-quarters ; height of dorsal fin, nine inches and three- 

 quarters ; length of dorsal fin, ten inches and one-quarter ; 

 length of the free portion of it, three inches ; space between 

 the first and second dorsal fins, one foot eight inches ; length 

 from the snout to the anal aperture, three feet eight inches ; 

 extreme breadth of the tail, one foot eight inches ; length of 

 the tail in the mesial line, six inches and one quarter. 



