IIo 
Notostomus westergreni, Faxon. 
1893. Notostomus westergrent, Faxon, Bull. Mus. Comp. Zool. 
Harvard, Vol. XXIV., p. 208. 
1895. Notostomus westergrent, Faxon, Mem. Mus. Comp. Zool. 
Harvard, Vol. X VIL, (ps 27,4. 
The long, straight, or very slightly sinuous rostrum, measured 
to the base of the eye, is three-sevenths of the total length of 
the carapace (rostrum included). Its under margin has fifteen 
teeth, not evenly spaced, and beginning some little distance 
in advance of the eyes. On the upper margin, there are twenty- 
eight teeth, ascending the slope but not fully reaching the level 
part of the carina, which is finely serrate behind the teeth 
almost completely up to the hind margin. In Faxon’s speci- 
men the rostrum was defective. Apart from this his lucid 
description of the carapace with its numerous carinae minutely 
tallies with our specimen, the only difference being that the 
dorsal median line of the carapace might here be described 
as rather considerably, instead of “ but moderately,” elevated 
above the level of the rostrum. 
The antennal scale in our specimen agrees fairly well with 
that figured on Faxon’s plate, but the outer apical tooth is 
much longer on the left scale than on the right. The flagellum 
of the second antennae and the upper branch in the first 
antennae are of great length. 
Of the pleon, Faxon says, “ All the abdominal segments are 
carinated in the dorsal median line, and the third, fourth and 
fifth are armed with a posterior tooth; the first and second 
segments are notched posteriorly in the dorsal median line. 
The telson is channeled on the dorsum, and furnished with 
about four pairs of dorsal, but no marginal spines; its tip 
is broken off and its armature thus obliterated.” The South 
African specimen has the sixth segment posteriorly toothed 
just as strongly as the preceding three, and if Faxon’s species 
be without this fourth tooth, some suspicion might be justified 
in regard to the identity of the two forms. But according to 
the figure N. westergrent has the sixth segment toothed, though 
less sharply than the companion segments, a circumstance on 
which little stress can be laid, seeing that both telson and 
rostrum were damaged, and any outstanding point may 
easily have been likewise blunted. 
The telson is fringed with sete for the distal two-thirds of 
its length, carries five pairs of very small dorsal spines external 
to the bicarinate median channel, and a pair at the very narrow 
but_not sharp-pointed apex. This apex reaches a little beyond 
