46 CRUSTACEA COPEPODA. II. 
enlargement and consequently showing not only their shape but their relative size. In the maxilliped the second 
joint is, as mentioned above, strongly produced as a process below the third joint, so that this process together 
with third joint and the real claw constitutes a kind of imperfect chela; the process has its rounded end 
equipped with some minute bristles. Fig. 6d exhibits the two left thoracic legs described above (p. 43); 
fig. 6 e the posterior part of the body with the caudal rami, each terminating in a very thick spine not longer 
than the ramus. ; 
Remarks. — A. Brian described and figured! a female with its male of a Chondracanthus, which 
he referred with a query to Ch. vadiatus; the parasite was found on Coryphenoides gigas captured at Lat. 
38°08’ N., Long. 23°183/,’ W. Judging from Brian’s figures of female and male the parasite cannot belong to 
Ch. radiatus. The female differs from this species in various particulars, most of them noted by Brian (who 
has translated a considerable portion of Kroyer’s text into French) ; and his figure of the male differs in various 
features. Thus the shape of the maxillz, the maxillipeds, the caudal rami, and above all in the fact that on 
two figures we find three pairs of thoracic appendages, while Ch. radiatus has only two pairs, and no male 
of any boreal or arctic species of Chondracanthus examined by me possesses more than two pairs of thoracic legs. 
Occurrence. — The “Ingolf” captured at two stations specimens of Macrurus Fabricw with this 
parasite in the branchial cavity. 
Davis Strait: Stat. 35: Lat. 65°16’ N., Long. 55°05’ W., 362 fathoms, temp. 3°6; 1 female on the 
lower wall of the branchial cavity. 
— — Stat. 27: Lat. 64°54’N., Long. 55°10’ W., 393 fathoms, temp. 3°8; 1 small and 2 
large females on the inner side of one of the gill-covers. 
Kroyer’s specimens were taken on Macrurus Fabricit and probably at Godthaab (by Holbdll); O. Fa- 
bricius states, that it lives on Coryphena rupestris, but according to Liitken (1898) Cor. rupestris Fabr. (not 
Gunn.) is synonymous with M. Fabrnici. 
Ch. radiatus is hitherto only known from West Greenland. 
Diocus Kréyer. 
This genus was established on a single form, D. gobinus O. F. Miill., from West Greenland; the “Ingolf”’ 
material contains another and hitherto unknown species. Kroyer pointed out that the genus is so closely 
allied to Chondracanthus that it is not easy to draw a fair distinction between them. As 2 species are now 
known, some remarks on the structure of both sexes may be made here. 
In the female the body consists of a small head, a large trunk with three pairs of processes, and a 
small abdomen. In the adult the antennulee are quite small and indistinctly jointed (or in D. frigidus possibly 
wanting) ; the antennz consist of a small but thick joint with a robust claw; the mouth-parts in D. gobinus 
according to Kroyer (1863, p. 333) nearly as in Chondracanthus. The body is divided into an anterior part 
with a single pair of processes, and a posterior part with two pairs, sometimes ramified. 
The male is in general aspect (Pl. III, fig. 8 c) and most features similar to those of Chondracanthus, 
1 Résultats Camp. Scient. par Albert rer, Prince Souv. Monaco, Fase. XXXVIII, 1912, p. 34, Pl. V, fig. 6 et 7; Pl. XI, 
gee tae’ 
