181 
OVISACS. They are mentioned in the description of the genus. In pl. XI, fig. 3b 
and fig. 3¢ are drawn on the same scale of enlargement, thereby illustrating the relative 
size etc. of the ovisacs. The largest of the ovisacs, represented in fig. 3d, is ‘90 mm. in 
length and contains larvee, of which only six are drawn. 
LARVA. Full-grown larve prepared out of an ovisac agree closely with those of 
the following species; the only difference I have been able to find is, that the inner side 
of the terminal joint of the maxillipeds is smooth in this species and spinous in the following 
one. As for the rest, the reader is referred to the description of the next species. 
POST-LARVAL DEVELOPMENT. The stages found are described in detail 
above on p. 61—63. 
HABITAT. The marsupium of Lrythrops serratus G. O. Sars and Parerythrops 
obesus G. O.8., and a female together with the following species in the marsupium of 
Erythrops abyssorum G.O.S.; all from Norway. The following special data can be given. 
In a specimen of Parer. obesus without special locality, one large female was found attached 
to the inner side of the hindmost right marsupial plate near its base; it carried fifteen 
ovisacs, one of which was empty; and two males appeared together with it. In an Lr. 
serratus (with two specimens of Aspidoecia) without special locality, occurred: an almost 
empty female (with twenty-one spermatophores), carrying fourteen ovisacs of widely differing 
sizes, one of them half emptied of young ones, another quite empty, and to the latter were 
attached six males, one of which had four spermatophores fixed to the ventral side of its 
trunk; further: an empty, partly destroyed skin of a seventh male, another male (the eighth) 
fixed by a frontal thread, and a larva about to become a pupa. fr another Hr. serratus, 
the locality of which was not specified, was discovered one large female (type specimen of 
fig. 3b) attached by its head to the basal part of a marsupial plate and carrying thirteen 
ovisacs (six and seven), and together with it a halfgrown female and a female in the 
stage represented in fig. 1d, each fixed to a separate marsupial plate by a dorsal thread. 
In one specimen of Hr. serratus (with at least one Aspidoecia), from Kyali, a part of the 
contents of the marsupium was washed away, but still three adult females, all with ovisacs, 
and one male were found; in a specimen of the same species from Sunde, the marsupium 
contained only one female with two ovisacs. Another specimen of the same species from 
Sunde was highly interesting. Its marsupium contained, to begin with, the bulk represented 
in fig. 3a, the greater part of which consisted of a rather shrivelled female with seventeen 
ovisacs, some of which contained eggs, others Nawplii or pretty old larvee, two were nearly 
emptied of larvae, and one of the ovisacs was three-lobed, the majority of the others more 
or less distinctly pyriform. The bulk was placed as follows: the part of it which is upper- 
most in the drawing, was foremost in the marsupitn, the part of it which turned towards 
the abdomen of the host, was flat, but the opposite, ventral side strongly arched, as shown 
in the illustration. This bwk contained, moreover, two males, the pupa fastened by a dorsal 
thread and drawn in fig. 1c, and a very small pupa, like the one represented in fig. 31. 
