14 
(4, p. 22, Pl. IV, Figs. 1—5) describes as "die erste Cyclopsform” 
(the ""Cyclopid-stage” of Pedasehenko (17, p. 279)) and with the 
"Cyclopsform” described by Wierzejski (22, p. 571, Pl. XXXII. 
Fig. 4), found on the gills of Cephalopods and supposed by W. to 
belong to a species of Pennella. I only succeeded in finding 3 
specimens of this stage, probably arisen from a Nauplius or Meta- 
nauplius (embryonic Naupliæ I did not find in the preserved egg- 
strings, and consequently I was not able to isolate any). The spe- 
cimen figured on Pl. II, Fig. 11—12 was found attached to the 
left side above the pectoral fin of a young Scop. glacialis, only 
12 mm. in length. The other two were both fixed on a Scop. gl., 
25 mm. in length, the one to the left ventral fin, the other to the 
left pectoral. They were all attached by means of their strong eheli- 
form antennæ. Evidently this stage is capable of active wandering 
from one spot to another of its host, probably also of swimming 
along for a while and attaching itself again. This seems to be 
proved by the whole elegant Cyclops-shape, the proportionally large 
swimming feet, the antennules etc. The length is between 0,448 
and 0,5 mm. Of the specimen figured, ca. 0,5 mm., the elongated 
ovoid cephalothorax makes up 0,352 mm., the rest 0,112. The 
rostrum is curved downwards. The antennules are provided with 
sense-hairs along their front margin and with long setæ distally, 
at least of half the length of the cephalothorax. The antennæ are 
strong and projecting, the stout basal segment almost vertically bent 
against the cephalothorax; of their three segments the basal one is 
nearly cylindrical and strengthened by chitinous ridges, while the 
remaining two form a large chela, the longitudinal axis of which 
is parallel to the cephalothorax. The terminal segment is a long, 
elegantly awl- or sickle-shaped claw with a curved point, acting 
against a sharply pointed process on the elongated second segment; 
the latter carries at some distance another somewhat smaller hook. 
The sipho is relatively short; lateraily it carries the maxilla (mx) with 
its two stout setæ, and just above the root of the maxilla a fairly 
long, slender appendage ending in a single long seta (md); this I 
