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I can indicate the special localities of only three specimens of B. pelagica: they were all 
taken in the Kattegat on the cruises of the »Hauch«, two at St.486 (in a depth from between 
eight to eighteen feet, on sandy bottom, and the third at St. 113 (depth: four fathoms, on 
coarse, White sand). — In order to give an idea of the unique degree in which this species 
infests its host, it will be sufficient to copy my notes on the contents of the marsupium in 
five of the most infested specimens. In one animal were found: three large females, all 
attached, one to a gill, the other to one of the plates of the marsupium, further: two very 
small attached females, seventeen males, three good-sized ovisacs and two larve, one of 
which was hinged to a gill. In another specimen were found: one large female, ten males 
(at least three of which were hinged, one on each side of the same gill, the third to another 
gill, and they were so solidly attached that I could examine the phenomenon more closely); 
further: one ovisac, one rather broad larva and four thick larvee (»male pupze«). In a third 
specimen were found: four females of very different size (in one specimen, the longest diameter 
of which measured 41 mm., the ventral thread was -13 mm. in length), eight males, four 
ovisacs, one narrower and one broader larva, as well as one »male pupac«. In a fourth 
specimen occurred: one large and two small females, eight males, no ovisacs, four broad 
larve, sixteen »male pupe« (six of which were hinged on the gill of the third right leg 
together with a broad larva) and one female pupa. 
In the marsupium of three specimens of Perioculodes longimanus (Sp. Bate) (= Mono- 
culodes Grubei Boeck) from Denmark I have found females which I cannot possibly distinguish 
from this species. In one specimen occurred: one female, the longest diameter of which is 
‘47 mm., and four ovisacs of sub-equal size, one of them was 39mm. in length and °30 mm. 
in breadth; on each of the other two specimens was found only one female, the larger one 
of which measured ‘71 mm. On account of similarity in their mode of attachment, in the 
structure of the antennulze with their long terminal sete, in the hairs on the frontal margin, 
in the shape of the maxille and of the maxillipeds and in the essential features of the 
structure of the genital area, I must for the present admit these animals as belonging to 
S. paradoxa, but as long as the male is not known, it is safer not to pronounce any definite 
judgment about such small and rather difficult forms. 
REMARKS. The name of the species is chosen on account of the very peculiar, 
hitherto unique, ventral attachment of the female. 
12. Sphzronella abyssi n. sp. 
(PI.IV, fig. 2a—2e). 
FEMALE. The only specimen found was ‘96mm. in length, 1:13 mm. in breadth, 
somewhat irregularly crooked and rather flattened (fig. 2a). The head was squeezed against 

investigation. In this work I have accepted the established species in separating B. pelagica and B. Robertsonii 
from each other according to the existence or non-existence of spines on the dorsal part of the fourth 
abdominal segment. 
16 
