158 
much like those of the preceding species, only the penultimate joint and the long terminal 
seta are comparatively a little shorter. Maxillule as in the preceding species. Basal joint 
of the maxilla as in S. decorata, second joint distally provided with a number of tolerably 
long, stiff sete, third joint has at its inner margin four processes, the outermost of which 
is much longer than the others and conspicuously longer than the curved end of the joint. 
Abdomen as in the two preceding species; the sete of the caudal stylets somewhat exceeding 
half the length of the body. 
POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. The marsupium of Ladorella trancatula (Sp. Bate) from Denmark. In 
a Jarge material I found only four infested specimens; one of them has no special locality, 
whereas the three others were taken in the Kattegat on the cruises of the »Hauch«, two of 
them at Stat. 383 (fourteen fathoms), the third at Stat. 387 (seventeen fathoms). In one 
specimen (from Stat. 387) occurred: only one female and one male; in another (from Stat. 383): 
one female, two larve (intruders) and about twenty-four of the host’s own eggs; in a third 
specimen (from Stat. 383) were detected: one female, one male, three mutually adhering ovisacs 
and one of the host's own eggs. In the fourth specimen were discovered: an oblong lump 
consisting of about a score of firmly adhering ovisacs, partly covering a female which was 
lying towards the front, further: a male and a disturbed ovisac, the larva of which were 
breaking out. 
30. Sphzronella insignis n. sp. 
(Pl. IX, fig. 4a—4g; pl. X. fig. la—ih.) 
To begin with, I will observe that I have assigned to this species specimens from 
two species of the genus Diastylis, viz. D. levis Norm. and D. cornuta Boeck. However, 
from each of these species I possess only one female, one male and some full-grown larve. 
To the differences between the two females I can attribute no value, and the differences 
between the two males from the two species of hosts are not greater than those which I 
have found in other forms of the family between specimens taken on the same species of 
hosts; between the larvee there is no difference. However, in order to present the deviations 
found, I give three double sets of figures, and point out the differences in the corresponding 
text; but, in spite of the scantiness of my material, I really do not doubt that it is the 
same parasite which lives in both species of hosts. 
FEMALE. A specimen (from D. lavis) was 1:16 mm. long, ‘88mm. broad (fig. +a), 
and somewhat flattened. The head is not defined from the trunk, and it agrees very closely 
(fig. 4c) in all details with the preceding species. The antennule (fig. 4¢ from D. levis, 
fig. 4f from D. cornuta) scarcely offer any characteristic, and the same remark applies to 
the mouth. The branches of the maxillule, at least in the specimen from D. levis, is some- 
what longer than in S. dispar; additional branch wanting. The maxille a little smaller 
