91 
and M. neglecta H. J. H., and an examination of all these only exhibited parasites on eight 
adult females of M. Bruzelii; in five specimens this Stenothocheres was found, in three 
others Spheronella Metope n. sp. (s. later on). The second locality is: »lat. 66° 30’ N., 
long. 54° 50‘ W., forty fathoms, stones with many Balani, 5. VIII. 1886, Th. Holm<; 
here was taken a very great number of Met. Bruzelii and of M. sinuata, but whereas the 
latter is free from parasites, Stenothocheres occurs frequently in the first mentioned species, 
while no specimen of Spher. Mctope was found. Unfortunately the abundant material from 
this locality was somewhat roughly handled, as the animals while still alive had been put 
into too strong spirit. I investigated and put down statistics on the contents of the marsupia 
of twenty-three infested females, which, added to those from the former locality, makes a 
total of twenty-eight. In one case neither females nor males were found, but at least twelve 
larvee and a lump of six eges without larvee. In another case only one not halfdeveloped 
female was found; in a third marsupium two females, but neither males nor eggs. In twenty- 
five cases a female was found, and often a male besides, in one case even two males (once 
I also found a normal male and the larger part of the skin of a dead male), and finally, I 
frequently met with eggs or recently hatched larvee. Concerning the eggs, I refer to the 
description given on p. 44. The female was always seen in the foremost part of the mar- 
supium, the male and the eggs behind. Only in a few cases a frontal thread was found 
in the male. Subsequently more material of Met. Bruzelii was examined (adult females as 
well as young specimens), in order to find — if possible — stages of development. Several 
finds in adult females corresponded to the above stated results, but in one young female 
with scarcely half-developed marsupium I succeeded in finding two larvee which had evidently 
swum in beneath the body of the animal, and in a young specimen without marsupium [ 
found a single larva. From all these data it may be concluded that, at least as a rule, the 
female is infested before the marsupium is quite developed. At least one of the last-men- 
tioned larve had hinged itself by the usual adhesive frontal plate, but about the subsequent 
development I learned nothing. 
2. Stenothocheres Sarsii un. sp. 
(Pl. I, fig. 2a—21,) 
FEMALE. The largest specimen (fig. 2a) is swollen to such an extent that the 
body is vaulted beyond the abdomen, so that this part does not add to its length or breadth 
which are respectively °80 mm. and 69 mm. The specimen exhibited in fig. 2d and fig. 2 
is only ‘67mm. in length. Seen from below, the body (apart from the abdomen) is a short, 
at the ends rather flattened oval; seen laterally (fig. 2e), the ventral surface is rather flat, 
the back considerably vaulted. Between the base of the antennule is found an odd, blunt, 
horizontal process of considerable size. The antennz weak, with indistinct articulation, the distal 
12* 
