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HABITAT. The animals live in the branchial cavity of Cumacea, causing a gradual 
swelling of the carapace above the place which is occupied by the parasite and its ovisacs. 
A parasite with several ovisacs may be found on immature specimens of both sexes as well 
as on adult females. Two infested adult males have also been found. The larve infest not 
only immature specimens, but frequently also females with marsupium. The two species 
here described come respectively from Denmark and from Messina (and a deep-sea species 
was found on a Diastylis brought home by the »Ingolf« expedition)’). 
REMARKS. The genus is distinguished partly by the shape of the trunk-legs, 
partly by the similarity of both pairs in the male as well as in the two sexes mutually, and 
by their resemblance to the caudal stylets. In giving the genus its name, I have tried to 
allude to this conformity in the appendages. The females are very small, more so than in 
any other genus, which harmonises well with the scanty room left for them in the branchial 
cavity of their rather small hosts. The males, on the contrary, are uncommonly large in 
proportion to the females: in the large species about half the length, in the small one even 
longer than a middle-sized adult female. (In H. mediterranea the antennule of the male 
are decidedly 2-jointed; what in fig. 1f on pl. XIII appears to be a short basal joint, is an 
angular excrescence proceeding from the head. On the other hand, the antennule of H. 
minuta sometimes appear to be 3-jointed, as the two last joints, though coalescent, are 
separated by a distinct line, which, however, is too strongly marked in the drawing.) 
Conspectus of the Species. 
In the female the basal joint of the maxillipeds is comparatively more slender, a 
good deal longer than half the breadth of the head at its base. Trunk-legs and caudal 
stylets of the male are long, longer than half the breadth of the body, and furnished with 
Nairseapouteall over ube md 1Stall ell teense eee eee em eee 1. H. minuta nv. sp. 
In the female the basal joint of the maxillipeds comparatively stout, scarcely longer 
than half of the head at its base. Trunk-legs and caudal stylets of the male shorter, not 
nearly half the breadth of the body, and with very few or no hairs. 2. H. mediterranea n. sp. 
1. Homoeoscelis minuta n. sp. 
(PII, fig. 3a—3b; pl. I, fig. 1a—t11). 
FEMALE. The largest specimen (fig. 1b), which had not begun laying eggs, is 
‘52mm. in length and 49mm. in breadth. A female which has nearly finished laying eggs 
(fig. 1c) is only “35mm. long and 39mm. broad. The frontal margin has seven small incisions 
1) J. Bonnier, in his above-mentioned treatise, published probably in Febr. 1897, under the name of 
Spheronella sedentaria Bonn. described a species belonging to this genus. He found it in the branchial 
cavity of Cyclaspis longicaudata G.O.Sars, taken in a depth of 960 metres in *Le Golfe de Gascogne”. 
