76 G. 0. SARS. CRUSTACEA. [norw. pol. exp. 



with several rows of spinules. Last pair of legs wanting in female, rather 

 small in the male, left leg 5-articulate, right 3-articulate, and scarcely more than 

 half as long as the left. Length of adult female 1'12 mm., of male 1'08 mm. 

 Remarks. This is likewise a very small Calanoid, though somewhat 

 larger than the above-described Pseudocalanus pygmceus, from which it is 

 at once distinguished by the exceedingly long anterior antennae, and the flat- 

 tened, quite unarmed front. 



Description of the Female. 



The length of the body in fully adult specimens does not seem to exceed 

 1'12 mm., and this form is accordingly of about the same size as the type 

 species, the length of which is indicated by Dr. Giesbrecht to vary from 

 1-10 mm. to 1-25 mm. 



The general form of the body (see figs. 1 & 2) is comparatively short 

 and compact, with the anterior division more than 3 times as long as the 

 posterior, and moderately vaulted above (see fig. 2). Seen dorsally (fig. 1), 

 this division exhibits a rather regular oblong oval form, with the greatest 

 width behind the middle, the anterior extremity being obtusely rounded, the 

 posterior scarcely broader, and but shghtly emarginated in the middle. The 

 cephalic segment is coalesced with the 1st pedigerous one, no distinct boun- 

 dary being observable between them (in the type species, such a boundary is 

 said to be present). Its frontal part is somewhat flattened, appearing, in a 

 lateral view of the animal (fig. 2), narrowly rounded and without any trace 

 either of a rostral prominence, or of tentacular filaments (see also fig. 3). 

 The lateral corners of the last segment, which more properly represents 2 

 united segments, are not at all produced behind, but evenly rounded off. 



The tail is very short, and, as usual, composed of 4 segments, the 1st 

 of which, the genital segment, is somewhat dilated in front of the middle, 

 and exhibits below a rather conspicuous rounded protuberance. The last, or 

 anal segmentj,(see fig. 12), is of about the same size as the preceding one, and 

 is slightly insinuated behind between the insertions of the caudal rami. The 

 latter are very short, scarcely longer than they are broad, and, as in Pseudo- 

 calanus, carry each 4 plumose setae and a small bristle at the inner corner. 



The anterior antennae (see figs. 1 & 2) are very strongly developed, 

 and much longer than the whole body, projecting, when reflexed, about 



