

40 RECORDS OF THE S.A. MUSEUM 
bears two such plates on each side. The first antenna is composed of eight dis- 
tinct segments, the long second segment probably being composed of segments 
two to eight as in cristatus, but the fusion is so complete that it is difficult to 
make out the individual segments. The second antenna appears to be composed 
of only two segments but the basal segment is indistinctly and incompletely di- 
vided near the base, in a position comparable to that of cristatus. As in that 
species the end segment bears one small lateral and two longer unequal terminal 
setae, all plumose. The siphon is typical in being short and strongly built, with 
the distal portion little, if any, longer than the large base; it is distinct in hav- 
ing a pair of barb-like projections near the base of the tubular portion, hence 
the specific name. The maxillule is almost exactly as in cristatus, except that 
the shorter of the two spines on the outer lobe is sickle-shaped. The maxilla and 
maxilliped are of very strong construction, particularly the former, in which 
the basal segment is very powerful and the claw a long, strong, one-segmented 
structure distally curved and bluntly rounded terminally. The maxilliped is 
like that of cristatus, though more powerful. 
The first pair of legs shows the typical two-segmented rami, with reduced 
setae; the second, third, and fourth exopods all have three outer spines on the 
end segment. The fourth endopod is absent but, as in cristatus, there is a large 
projection from the basal segment which is composed of the normal two segments 
(coxa and basis) completely fused. The seta formula for the legs is: 
endopod. exopod. 
p-l 1.220. 0.122. 
p2 1,2.321, 11.423, 
p.3 1.2.311. 1.1.423. 
p.4 — 1.1.323. 
The end segment of the third endopod lacks the terminal spine and both second 
and third legs have the triangular prominence shown on the fourth basipod; this 
appears to correspond to the inner corner of the basipod of the first lee, some- 
what displaced owing to the shape of the basipods in these legs. The fifth legs 
are reduced to minute rounded knobs bearing each a single seta. 
The anal segment is dilated posteriorly and the caudal rami are about as 
wide as long and a little more than half of the anal segment. This species is of 
similar size to cristatus but much smaller than scaber (3-5 mm.). The male was 
not seen. 
Famity ARTOTROGIDAE Sars. 
Sars, 1915, p. 132. 
The family was created by Sars for two genera, Artotrogus and Dystrogus, 
in which the body tends to be sub-circular and the fourth legs are absent. In the 
latter feature they approach the Cancerillidae, but those are distinguished from 
other Siphonostoma in having the second antenna modified into strong prehensile 
organs. 
Artotrogus has hitherto been known only from the female (a male was 
found here), while Dystrogus is known only from the male. (*) 
According to Giesbrecht (1899, pp. 110-111) they are distinguished by the 
siphon, which tapers to a more or lesss narrow tube in Artotrogus, while in 
Dystrogus it is of the same width throughout. The other characters quoted by 

(3) Brady (1910, p. 583) described a species as Dystrogus uncinatus from a female. But this 
cloarly has four pairs of legs, according to his statement, and cannot therefore belong to this 
family. 
