TILE DAJIDZE 399 
Hoek has stated that the male in this stage is com- 
pressed laterally, so as to look hke an Amphipod, and that 
it is fixed to the body of the female by the aid of a sucker. 
Giard and Bonnier remark that the lateral compression 
would be very astonishing, since all the Epicarids in the 
cryptoniscian stage tend to be flattened. From specimens 
sent me by Dr. Fulton of the Scotch Fishery Board, I 
should say that these cryptoniscian forms of the male were 
decidedly flattened, not compressed, but these specimens 
were taken or found apart from females, whereas Dr. 
Hoek’s may have been modified by their position as 
attached to the female. The suboral circular sucker is a 
conspicuous object, which attracted Dr. Fulton’s attention 
at once. It appears to have escaped notice that this ring 
is shown in the figure of Dajus mysidis, Kroyer, on plate 
28, fig. 1a, of the ‘ Voyages en Scandinavie, &c.’ Dr. 
Hoek has figured the curious hand-shaped spines on the 
sixth joint of the legs. Some of these spines are split as 
it were into five fingers and a thumb. 
Three species are at present allotted to the genus :— 
Dajus mysidis, Kroyer, 1846, on Mysis oculata 
(Fabricius). 
Dajus mixtus, Giard and Bonnier, 1889, on Mysis mixta, 
Lilljeborg. 
Dajus sirielle, Sars, 1885, on Siriella Thompsonii 
(Milne-Edwards). 
Aspidophryxus, Sars, 1882. The animals are attached 
to the back of the perzon of the host. The female is 
much more curved than in Dajus. It has the five pairs 
of feet more elongate, the first four pairs of marsupial 
plates very small, not overlapping from side to side, the 
last pair very elongate, soldered together longitudinally ; 
the pleon unsegmented, without appendages. In the male 
the pleon has an indication of the segments of which it is 
composed, the sixth especially being distinct; the only 
appendages are the two-jointed uropods. 
Aspidophryzus peltatus, Sars, 1882, on Hrythrops ery- 
throphthalmus (Goés). Eggs many and small. 
Aspidophryxus Sarsi, Giard and Bonnier, 1889, on 
