105 



and broad, transversely truncated at the tip, setae much reduced in number, only 

 3 on each ramus being fully developed. Eye rather large and situated far 

 forward. Anterior antennae slender, and composed in female of 25 articulations, 

 the last rather small, but well defined from the preceding one; right anterior 

 antenna in male geniculate. Posterior antennae with the outer ramus much nar- 

 rower than the inner, and composed of 6 joints only. Anterior lip comparatively 

 large and broad, with the median lobe densely hairy. Mandibles with the cutting 

 teeth simple, not bidentate, palp with the inner ramus much longer than the 

 outer. Maxillse normal. Maxillipeds rather strongly built, the anterior ones with 

 the terminal appendages claw-like, though comparatively short; the posterior ones 

 with the 1st basal joint comparatively broad, and carrying anteriorly unusually 

 strong seta?, terminal part composed of 4 joints only. Inner ramus of all the 

 natatory legs very small and uniarticulate, terminal joint of outer ramus with 

 only 2 spines outside, apical spine in 2nd to 4th pairs coarsely serrate on the 

 outer edge. Last pair of legs in female 4-articulate, 1st joint confluent with that 

 on the other side, terminal joint of different form in the different species and 

 coarsely dentate, apical denticle generally much elongated and claw-like; those in 

 male on the whole built upon the same type as in the genus Temora, the left leg 

 being much the larger, and having a long curved, thumb-like process issuing from 

 inside the 2nd joint. Ovisac in female wanting, or at any rate imperfectly 

 developed. 



Remarks. This genus was established in the year 1863 by the present 

 author, to comprise 2 Norwegian fresh-water Calanoids, one of which had been 

 described at a somewhat earlier date by Prof. Lilljeborg as a species of Diap- 

 tonnis. The genus is unquestionably referable to the family Temoridcc, as here 

 defined, the last pair of legs in particular exhibiting an evident resemblance in 

 their structure to those in the typical genus Temora. Yet this genus is clearly 

 characterised both from Temora and the other genera comprised in this family 

 by several pecularities, among which may be mentioned the rudimentary condition 

 of the inner ramus of the natatory legs, a character which has given rise to the 

 generic name. We know at present 4 specias of this genus, one of which has 

 been found in the Caspian Sea, whereas the other 3 are true fresh-water forms. 

 These 3 species belong to the fauna of Norway, and will be described below. 



15 Crustacea. 



