32 



/ 



to include the form erroneously identified by Brady with Pseudocalanus armatus, 

 Boeck. As, however, no description was given, the generic name Vndinopsis was 

 overlooked, and replaced in 1897 by Dr. Giesbrecht with that of Bradyidius. I 

 think, however, that I am justified in maintaining the name at first given by me 

 to this genus. In most of the anatomical details it agrees rather closely with the 

 genus Chiridius, although differing rather markedly in a few points. The anterior 

 antennae in the female, for instance, are of a very different appearance, owing to 

 their much coarser structure and the dense supply of unusually strong bristles, 

 which give them a peculiar hirsute appearance. In the relative length of the 

 rami of the posterior antennae, and in the robust form of both the posterior 

 maxillipeds and the natatory legs this genus also differs conspicuously from 

 Chiridius. The genus comprises, 2 nearly-allied species, both of which exactly 

 agree in habits, and, unlike what is generally the case with the Calanoida, are 

 true bottom-forms, never found except close to the ground. 



12. Undinopsis Bradyi, G. 0. Sars. 



(PL XIX, XX). 



Undinopsis Bradyi, G. O. Sars, in Sp. Schneider's Report of Invertebrata from 

 the Kvsenangen Fjord, 1884. 



Syn: Pseudocalanus armatus Brady (not Boeck). 

 Bradyidius armatus, Giesbrecht, Scott. 



Specific Characters. Female. Anterior division of body, seen dorsully, 

 oval fusiform in shape, greatest width considerably exceeding 1 / s of the length, and 

 occurring in the middle, both extremities about equally narrowed; seen laterally, 

 moderately vaulted above, frontal part obtusely truncated anteriorly, and pro- 

 jecting below to a small, but highly chitinised and distinctly bifurcate rostrum. 

 Lateral projections of last segment of metasome very strong, mucroniform, and 

 slightly divergent, reaching beyond the genital segment. Urosome not nearly 

 attaining 1 / s of the length of the anterior division, genital segment slightly incras- 

 sated, though not very protuberant below. Caudal rami scarcely longer than 

 they are broad, and rounded at the tip, apical setse distinctly biarticulate and 

 very much elongated, especially the innermost but one. Eye in the living animal 

 very conspicuous, bright red, and oblong in form. Anterior antennae about the 

 length of the anterior division of body, all 'articulations very sharply defined, with 

 the bristles strongly developed, especially the distal ones, which form together a 

 dense brush. Posterior antennae with the outer ramus scarcely longer than the 

 inner. Inner ramus of 2nd to 4th pairs of legs with scattered small spinules on 

 the posterior face. 



