98 ' ENDEAVOUR " SCIENTIFIC RESULTS. 



Teeth compressed, those of the upper jaw much smaller 

 than the lower ones. Upper symphyseal teeth triangular, 

 erect, with the edges entire ; the others become more oblique 

 towards the sides, the lateral oner, having the cutting edge 

 almost horizontal. Lower teeth with the cutting edge 

 nearly horizontal, and the margins of the cusps serrated. 



Eye large, its diameter a little greater than the length of 

 the snout before the nostrils ; the orbit is produced anteriorly 

 and posteriorly, its length equal to the preorbital portion of 

 the snout, and 1.09 in its distance from the anterior gill- 

 opening. Spiracle large, sub-triangular, situated a little 

 behind the corner of the orbit, and one diameter above it. 

 C4ill-openings increasing in width and becoming closer to- 

 gether backwards ; the last is one-third wider than the first, 

 and placed directly in front of the pectoral. 



Pectorals angular, the outer angles rather sharp, the inner 

 greatly produced, narrow, acute, and extending backward 

 to below the middle of the first dorsal. Dorsal spines strong, 

 compressed, the anterior exposed for less than half and the 

 posterior more than half its length ; the front edge of each 

 is sharp, with a narrow groove on each side of it, the pos- 

 terior margin broad and excavate. Origin of first dorsal far 

 behind the axils of the pectorals ; its base, exclusive of the 

 spine, equal to about two-sevenths of the interdorsal space. 

 Second dorsal rather less than two -thirds the size of the 

 first, its base half as long ; it originates behind the posterior 

 angles of the ventrals, and its hinder angle scarcely reaches 

 the level of the commencement of the sub-caudal. Ventral 

 small, the outer angle a little rounded, the posterior acute. 

 Caudal rather deep, about one-fifth of the total length ; 

 sub-caudal lobe well developed, separated from the terminal 

 lobe by a notch. Scales small, depressed, pointed posteriorly, 

 the upper surface rough with several keels which converge 

 towards the point. 



Colour. Grey above and on the sides, white beneath. 

 The posterior projections of the pectorals are white. 



Described from a female example, 870 mm. long. A 

 second specimen, a male, 907 mm. long, differs in some 

 important details ; the mouth is placed below the middle 

 of the eye, which makes the preoral length much shorter 

 than in the female ; the posterior gill-opening is much wider 

 than the penultimate one. and is twice as wide as the first ; 

 the inner angle of the pectoral is shorter, not reaching to 

 below the middle of the dorsal fin ; the ventral and second 

 dorsal are considerably larger than in the female, and the 

 end of the former reaches to below the anterior portion of the 



