APPENDIX. 
CENTROSCYMNUS C@LOLEPIS, Bocage & Capello. Abundant 
on the fishing banks off the coast (U.S F. C.) 
LEMARGUS BOREALIS, Mull. & Henle. Greenland Shark. 
The only specimen of this rare northern form the 
author has had the oppertunity of examining, was 
taken off Halifax Harbour in February, 1863, and 
afforded the following description Body fusiform, 
narrow at the tail. Extent from tip of snout to cau- 
dal extreme 11 ft. 3 in. Depth at deepest part, a 
distance of 1 ft. from posterior branchial aperture, 
2 ft. 4 in.; at posterior extreme of first dorsal 1 ft. 
10 in.; from posterior extreme of second dorsal 8} in.; 
at caudal base, 6 in. Skin covered with osseous 
tubercles. Snout obtuse, bearing above a series of 
small mucous pores, extending back 11 inches from 
snout, ever which lay the transparent jelly-like fluid 
they usually emit. Head; breadth over eyes, 1 ft. 
5 in. Hyves, diameter 2 in., bearing no pupillary ap- 
pendages, and distant from point ef snout 11 in., and 
from temporal orifices, 34 in. Temporal orifices, 
situate on a line with upper rim of eye cup, and dis- 
tant from point of snout 1 ft. 3 in.; extent 1} in. ; 
width ? in. Bronchial apertures, five in number, the 
posterior opening situate at the base of pectorals, and 
distant from frontal extreme 2 ft. 4 in., is 4 in. long 
and situate 14 in. from the eyes. Nostrils: situate 
beneath and distant from snout point, 6 in. ; extent, 
3in. Mouth: vertical gape, 84 in.; horizontal gape; 
12 in. Back: carinated from anterior base of first 
‘dorsal to an extent of 1 ft. 4 in. forwards. Pectorals 
commence immediately behind posterior branchial 
aperture ; width at base, 9 in.; extent 1 ft. 4 in. 
Ventrals commence 3 ft. 6 in. from posterior base of 
pectorals ; width at base, 6 in.; extent, 8in. First 
dorsal commences 4 ft. 7 in. froma snout point ; width 
at base, 11 in. ; extent from anterior base to extremi- 
ty, 18 in.; from posterior base to summit, 5} in. ; 
