110 
4. Spheronella vestita n. sp. 
(Pl. Il, fig. 5a—5 b.) 
FEMALE. The largest specimen (fig. 5a) is 49 mm. long and ‘335 mm. broad; 
the body is ovate, and the proportionally very large head occupies about one third of the total 
length; another specimen of the same shape is only 44 mm. long. Tufts or stripes of hair 
are found on the inner side of the basal joint of the maxille, on the skeleton outside their 
articulation, in front of and behind the basal part of the maxillipeds, as well as above the 
middle of their articulation. The trunk is densely covered all over with peculiar, very 
broad, apparently shorter than broad, obliquely proceeding »scales«, which are transformed 
hairs. The genital area of the large specimen (fig. 5b) is cut off; it was shortly oval and 
somewhat broader than long, yet somewhat longer compared with the breadth than the pre- 
ceding species; its solid chitine forms a ring which is rather broad in front, posteriorly it 
seems to be open; the distance between the genital apertures is moderately great; the caudal 
stylets are situated on the posterior margin of the area, and the distance between them is 
rather considerably smaller than in the preceding species; the region between and behind 
the genital apertures and the part surrounding the caudal stylets are closely covered with the 
above-described »scales«, while the remainder of the skin inside the ring has much fewer 
»scales«, and the ring itself is almost naked. The genital area of the smaller specimen 
seems to agree essentially with that of the larger one. 
MALE. Length: -234 mm. Resembles the male of the preceding species, but the 
median frontal plate seems to be a little longer and the second pair of legs a little shorter. 
OVISACS. They are somewhat to not very much smaller than the females. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. The marsupium of Microprotopus maculatus Norm. from Denmark; 
found only in two specimens. In one animal were found: one female (the largest), one 
male and four ovisacs, which are oblong, glued together and contain larve which are more 
or less, but not fully developed. In the other specimen were found: one female, one male 
and five ovisacs, each of which was somewhat smaller than the female. 
REMARKS. In the shape of the body, the hairs-tufts on the head and the 
peculiar close covering of »scales« on the trunk, the two females found agree essentially 
with the scarcely half-grown or very small females of S. danica; they are, however, some- 
what larger than these; each of them had a spermatophore attached to it and a developed 
genital area, from which we may conclude that they are both adult and have laid the ovisacs 
which were found together with them. This supposition is confirmed by the circumstance 
that the hosts are too small to contain parasites of the size of S. danica. 
