66 CRUSTACEA COPEPODA. II. 
it was impossible to discern any well chitinized arch encircling behind and on the sides the genital apertures, 
but the figure shows the stripe between the genital apertures clothed with numerous fine hairs, further- 
more that outside each genital aperture is found a stripe which proceeds backwards to outside the caudal 
ramus and turns inwards behind it, and this stripe is clothed with fine hairs; finally the figure shows that 
the caudal rami in the specimen investigated differ from one another, as one of them is simple, while the 
other has a secondary branch which originates from the thickened basal portion and is almost half as long 
as the main branch; both the rami and the secondary branch are pubescent towards the end. 
Ovisacs (fig. 1 b). — They are nearly globular, middle-sized, with few and proportionately large 
eggs; the diameter of the ovisac figured (with the ova a little oblong) is 0.36 mm. 
Larva. — Several well developed specimens prepared out of their egg-membranes are to hand; 
the total length (caudal rami included) is 0.25 mm. They agree not only in general aspect but in most fea- 
tures with those of the two species described in 1897, thus in the length of the sensory seta on the antennule, 
in extraordinary length and special structure of the antenne (fig. I e), in the maxille (fig. 1 f) and in the 
abdominal segments. But the maxillipeds (fig. 1 g) show marked differences; they are unusually long, as 
their proximal joint, which is nearly as long as the remainder of the maxilliped, is not only very much longer 
than the distance between maxille and maxillipeds, but even almost half as long as the cephalothorax; 
besides the claw is marked with about 6 slender spines along its concave margin. — Second abdominal 
segment about as long as the first. The longest seta on the caudal rami uncommonly long, even a little more 
than half as long as the whole body. 
Occurrence. — This parasite lives in the branchial chambers of Diastylis polaris G.O.S., and 
has been secured by the “Ingolf’ at two of its deepest stations in the cold area. 
South of Jan Mayen: Stat.117: Lat. 69°13’ N., Long. 8°23’ W., 1003 fathoms, temp. ~ 1°0; 
1 female and 4 ovisacs in the right branchial chamber of an adult female 
of D. polaris. 
— Stat. 113: Lat. 69°31’N., Long. 7°06’ W., 1309 fathoms, temp. ~ 1°0; 
in the right branchial chamber of a female Dzastylis 1 female and 2 
ovisacs, and the same number in the left gill-chamber. 
82. Homoeoscelis longipes n. sp. 
Of this new species the material comprises 1 adult female, 1 male and an irregularly shaped lump 
of ova, but both animals were found so misshapen by pressure that it is impossible to give a complete descrip- 
tion or tolerably accurate drawings. But being able to point out some features I think that the species can 
be recognized with certainty, especially when the interesting host is taken into account, as no Choniostomatid 
has hitherto been found on any specimen of the small forms belonging to the genus Leffostylis. 
Female. — The body in its natural shape has been about 0.44 mm. long. Hairs could not be per- 
ceived on any part of the animal. The head with its appendages does not seem to exhibit any noteworthy 
differences from that in H. mediterraneus H. J. H. The thoracic legs are long and excepting towards their 
base uncommonly thin, the first leg is even distinctly longer than the proximal breadth of the head and 
