120 
of the male in its posterior and lateral parts shows the peculiar feature (mentioned above 
on p. 42) of large, hollow spaces beneath the skin (fig. 4k). 
The first pair of trunk-legs are long and consist of one branch, and it is no doubt 
the outer branch which is preserved (sometimes even it appears to be set off by an articu- 
lation); the peduncle is long, proximally rather large, partly hairy; the branch ends in a 
seta which is nearly as long as the whole leg. The second pair of legs consist of a shorter, 
cylindrical basal part and a somewhat longer, a little more slender, cylindrical branch, which 
terminates in a seta which is even considerably longer than that of the first pair of legs. 
The caudal stylets are thick, their terminal seta being even longer than that of the second 
pair of legs, and about half to more than half the length of the whole animal. — The male 
is frequently found hinged by a frontal thread (fig. 4h, s) which measures about three eighths 
of the length of the body, and the distal part of which dilates gradually towards the end. 
OVISACS. They are oblong, varying trom a moderate to a very large size; the 
specimen represented in fig. 4d is “69mm. in length and ‘50 in breadth; it contains rather 
numerous eggs which are comparatively large. 
LARVA (fig. 1c). Length ‘22mm. The body slender; the cephalothorax about ?/s 
longer than broad; the front with an oblique list inside the anterior angle of the antennule. 
Antennule 2-jointed; olfactory seta comparatively short, less than double the length of the 
antennwla and about a third of the length of the cephalothorax. Antenne considerably 
shorter than the antennule, the first joint (comp. fig. le, for in fig. 1¢ there is a fault in 
the engraving) pretty thick, of the same length as the second one, third joint short, and 
the terminal seta equalling in length the two last joimts combined. Of the maxillule we 
find the posterior branch and one of the anterior branches in the shape of long sete, the 
hindmost of which is naked, and close in front of its base is seen a rather small conical 
process (fig. le), which is a rudimentary branch. Maxille and maxillipeds normal, with 
smooth joints. Abdomen chiefly as in S. Calliopii; however, the last segment and the 
caudal stylets which are distinctly set off, are a little larger, but the terminal seta is 
scarcely so long, a little more than half the length of the animal. 
POST-LARVAL DEVELOPMENT. The attachment of the larva and subsequent 
ereat change of form (fig. 1d), as well as the highly interesting development, is described in 
detail above, p.57—58, to which we refer. 
HABITAT. The marsupium of Bathyporeia norvegica G. O. Sars, B. pelagica Sp. Bate 
and B. Robertsonii Sp. Bate from Denmark. In a considerable material I found altogether 

eleven infested specimens, two of which are B. norvegica, tour B. pelagica and tive B. Robertsonii'). 
1) G.O.Sars, in his excellent work: “An Account of the Crust. of Norway, Vol. I’, admits altogether five 
species of Bathyporeia from Norway and the Baltic. Of these species B. norvegica G.O Sars and B. gracilis 
G. O. S. are decidedly good, and well distinguished from the three others, but whether these three species 
can be maintained, or have to be reduced at least to two (in regarding B. pilosa Lindstr. as a freshwater- 
form of B. pelayica), perhaps even to one, is difficult lo decide, and must be submitted to a new, thorough 
