152 
tolerably small branches of equal length, each of which consists of a somewhat thicker, 
very short joint, from the end of which proceeds a thick, but rather short, partly hairy seta. 
The second pair of legs are situated at the posterior angles of the trunk and greatly resem- 
ble the first pair, but the basal part is even more indistinct, the joint of the inner branch 
much shorter than that of the outer branch, and the terminal setae — particularly that of 
the outer branch — longer than in the first pair. Caudal stylets altogether wanting. 
OVISACS. They are pretty small or of medium size, circular or oval and mostly 
somewhat flattened; the ovisac represented in fig.3c¢ is one of the larger ones and is ‘94mm. 
in length. Eggs numerous and comparatively small. 
LARVA. Fig. 3i 
ege-membrane. The larva is °30mm. long and so slender that its cephalothorax is a little 

30 are drawn from specimens which had just broken out of the 
more than twice as long as broad. The front is richly decorated (fig. 31): its margin with 
a series of rather short and very short processes which begin at some distance from the 
base of the antennula and stop a short distance from the median line; the eight or ten pro- 
cesses nearest to this line are really situated somewhat within the margin and are much 
longer than the more lateral processes which proceed trom the edge; somewhat inside the 
more lateral part of the frontal margin appears on each side a long, oblique row of tolerably 
long, narrow processes, turning forward and outward in an oblique line; somewhat behind 
them we see a curved transverse list, and at the inner angle of this list — consequently in 
front of the mouth at a short distance from the median line — four or five rather long, and 
especially comparatively thick, anteriorly somewhat diverging processes with rounded apex. 
Antennule 2-jointed, their olfactory seta somewhat more than half the length of the cephalo- 
thorax. Antenne equal in length to the antennule; first joint broad, sometimes with a strong 
indication of being formed of two coalescent joints (fig. 3m), the first of which is short 
(comp. the following species); second joint of the same length as or a little longer than the 
first; third joint short, with two terminal seta, one of them short, the other nearly the 
length of the two last joints combined. The maxillule have all four branches well developed, 
the outermost being the longest, curved outward and backward, hairy. The basal joint of the 
maxillee has two rows of processes (fig. 30), but one of them is often covered by the second 
joint (fig. 3n), which has no sete; the third joint has two good-sized processes on its inner 
margin, but the distal one, which is the largest, is smaller than the long, curved, terminal 
part of the joint. Abdomen pretty long; a description of it is found above on p. 149. Sete 
of the caudal stylets more than three fifths the length of the body. 
POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. Found in the marsupium of six specimens of Diastylis Rathkei (Ky.) 
from West-Greenland and in one specimen from the Kara Sea, but not in Denmark. — It 
may be pointed out that I have found parasites in nearly half of the adult females from the 
two localities mentioned, which I have seen, whereas an investigation of several scores of 
females from various Danish waters gave a negative result. In one specimen occurred: one 
