136 
as a rule, ends in one or two short and one longer sete, the latter of which, however, is 
only half or scarcely half the length of the basal joint of the maxillipeds (sometimes there 
are two about equally long sete at the end of the outer branch), and finally a rather short 
seta on an angular process of the peduncle outside the outer branch. The second pair of 
legs comparatively pretty long, with a short outer branch at their base, ending in a shorter 
seta, while the inner branch ends in several sete, the longest of which is distinctly longer 
than the setz of the first pair of legs. The caudal stylets are rather small, with short sete. 
— The frontal thread is between two thirds of or the entire length of the whole body, 
simple, ending in a thick disk. 
OVISACS. ‘They are of medium size (fig. 3d), without great mutual difference (at 
least if not containing young ones), for the most part shortly oval; the ovisac represented is 
‘47mm. long and 39mm. broad. The eggs of medium size, not very numerous. 
LARVA. I have found no free specimen, and the larve which I pulled out of the 
ovisacs were not sufficiently developed to allow of giving a description of them. 
POST-LARVAL DEVELOPMENT. Some pupx of both sexes have been found 
(fig. 3i—31), and their interesting development is described on p. 54—5d, 
HABITAT. The marsupium of Protomedeia fasciata Ky. from Denmark. In a 
large material without specialised locality are found eleven infested specimens; a twelfth 
one was taken by Dr. Joh. Petersen in the Kattegat at Stat. 403 (twelve fathoms). Only 
seven of these twelve specimens have been very closely examined, but a statistic account of 
four of them will be sufficient. Im one specimen were found: the femaie represented in 
fig. 3c, with a male adhering to its ventral surface, and six ovisacs partly glued together. 
In another specimen were found: a good-sized female, a male and seven ovisacs, thus di- 
stributed: three ovisacs were lying beside and in front of the female, the remaining four 
and the male lying behind it; finally, a pupa was hinged to the base of the gill of the 
hindmost leg but one. In a third specimen occurred: one good-sized female, five males, 
three ovisacs and five pup; four of the males and all the pup were hinged to gills, to 
marsupial plates or to the epimera of the second — sixth pair of legs. In a fourth spe- 
cimen appeared the extremely large female represented in fig. 3a, one male and one pupa; 
the female occupied the front half of the marsupium, whereas its hindmost half was occupied 
by six of the host’s eggs, containing young ones about half developed; in which the limbs 
were very distinct. 
20. Sphzronella Bonnieri n. sp. 
(PI. VI, fig. 4a—44; pl. VII, fig. la—1b.) 
FEMALE. ‘The specimen represented in fig. 4a — the largest one found — measures 
‘97mm. in length and ‘94mm. in breadth. In the head and its organs of this species com- 
pared with the preceding, I have not been able to find any deviation which would seem 
