26 E. NORRIS WOLFENDEN. 



PARALABIDOCERA. 



There is no mention of any example of the genus Ldndocera in Giesbrecht's 

 ' Belgica ' report. In the ' Discovery ' collection there are a great number of specimens 

 of an animal superficially resembling Labidocera, but which does not agree with any 

 known species of that genus, though bearing some relation to L. wollastoni. Between 

 60 and 70 S. Labidocera acutifrons appears in the ' Gauss ' collection, but is absent 

 from either the ' Discovery ' or ' Belgica ' collections, and this genus is thus very 

 sparingly represented in the Antarctic area. The copepod referred to below differs 

 distinctly from any known Labidocera in the character of the swimming feet of the 

 female and the five-jointed abdomen of the male, and the fifth pair of feet, and I have 

 thought it better to create a genus for it. 



Characters of the genus. Very similar in appearance to Labidocera, but a total 

 absence of " ocelli," and of very unsymmetrical shape, the swimming feet without 

 spines on the last segment of the exopodite, and the male abdomen of five segments. 



PARALABIDOCERA HODGSONI. 

 (Plate VI., figs. 1-13.) 



9 T55-2 mm. ; <J 1*6 mm. long. The head is evenly rounded, produced 

 forwards a little, and in front are two delicate rostral filaments. There is no trace of 

 eyes, either dorsal or ventral, but in some males there are two dark spots laterally on 

 the head, and in a few females a dark pigmented spot on each side, which may possibly 

 have been ocelli. But considering the mode of preservation, which included freezing 

 and thawing, and a long sojourn in spirit, these organs may very well have been 

 present at some time, and subsequently vanished. The head is quite without any 

 trace of side hooks, and separated from the first thoracic segment ; last two segments 

 coalesced and produced on each side into lateral expansions, but bluntly ended. 

 Abdomen of three segments, the genital with large lateral outgrowths, and also 

 dorsally and ventrally swollen a little ; spines entirely absent ; next segment also 

 laterally enlarged, and anal segment small ; furcal segments a little unsymmetrical, 

 the right a little longer and broader than the left ; all tail bristles comparatively 

 short, consisting of four apical and one lateral marginal (situated a little distal of the 

 middle), all slightly thickened at the base. There is also a small accessory dorsal 

 furcal bristle on each side. Anterior antennae shorter than the cephalothorax and with 

 only twenty-two distinct joints, very densely covered with long bristles. 



PROPORTIONAL LENGTH OF ANTENNAL JOINTS. 



1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 



10 I 10 | 2 I 4 I 1J I 1 I 2 | 3 | 3 | 8 | 4 j 4 j 4 | 6 | C j 6 | 6 j 7 j 5 j 10 j 6 j 8} ' 



