— 30- 
dal, but it rises there, is falcated and narrow, a slight notch 
underneath and the lobe well developed. This fin is unusually 
long being contained only twice and a Gth in the leiigthof the 
hotly. It is of a dirty brown colour, and the shin is covered 
with scales laid like a fine pavement, except on the lower side 
of both lobes of the caudal where they are like a thick brush. 
Fine pores extend over nearly the whole body. 
“ The angle of the mouth shows in profile, the snout short 
and rounded, the nostrils between it and the eyes. These are 
large for so small a shark ; the head rises a little above them, 
anil overhangs them; giving the creature a most vicious and 
cunning look. A small grove lies behind the orbits; the spiacle 
is small and is close to the gills. There are six gills openings 
the first very wide and much deeper than the second ; they 
diminished in size to the Gth which lies in front of the base of 
the pectoral. The dorsal ventral and anal fins are small. 
“ The dentition is very curious. In the upper jaw in front 
arc G pairs of awl shaped teeth each in a heavy base, bent 
inwards facing in all directions, followed by others of a simi- 
lar shape, but flatter and with serrations on the broad base, S 
or 9 on each side, with an inner row lying flat, only developed 
since dry. The lower jaw has 5 or G large comb like teeth on 
each side, with serrations on the edge of the cusp, and a single 
square based medium tooth that has a straight cusp and ser- 
rations at the sides. 
“ I had quite forgotten to give “ Place aux dames ” as I 
see I have left my female shark till last. It is a small lie quin 
pave about 3 feet 9 inches long, an adult, from which was 
taken a single young one, a male, nearly 18 inches long, 
as perfectly formed as herself, except that the teeth are 
not yet developed. This fish seems to derive its name 
from the teeth which lie in even rows on the lips forming 
a sort of pavement more like a Hay than a Shark. 1 have 
had some difficulty in placing it, but find in group C. Ilustel- 
Una of the Carcharidce , genus Mustelns a description that 
answers to my shark, viz : Is# Dorsal opposite space between 
pectorals ond ventrals, 2nd. Dorsal not much less than the 1st 
no pit at root of caudal no distinct lower lobe, spiracles small 
behind eye, niembrana nic titans present, mouth with well deve- 
loped labial folds, teeth small and numerous, similar in both 
jaws like a pavement It is a native of both temperate and 
tropical climates. 
“The general colour is grey, whitish on gills and tips of 
fins, with a steel blue tinge on the 2 dorsals separated from 
