96 



Remarks. This family, as defined above, is chiefly distinguished from the 

 Centropagidas and Diaptomidce by the structure of the legs, and more particularly 

 those of the last pair, which never are natatory, nor exhibit in either of the 

 sexes any trace of inner rami. In the 4 anterior pairs these rami are moreover, 

 as a rule, much reduced in size, constituting in some cases small uniarticulate 

 pieces. The family comprises as yet 7 well-defined genera, viz , Temora, Baird, 

 Temoropia, Scott, Temorites, G. 0. Sars, Eurytemora, Giesbrecht, Heterucope, 

 G. 0. Sars, Epischura, Forbes, and Lamellipodia, Schmeil. Of these genera, the 

 first 3 comprise exclusively marine species, the 4th chiefly brack-water forms, 

 whereas the last 3 genera are peculiar to inland lakes. In the Norwegian fauna 

 3 of the genera are represented, and will be treated of below. 



Gen. 24. TemOra, Baird, 1850. 



Syn: Halitemora, Giesbrecht. 



Generic Characters. Form of body short and compact, with the anterior 

 division considerably vaulted above. Cephalosome remarkably dilated and exhibi- 

 ting at the end dorsally a gibbous prominence; front tipped with 2 very slender 

 and delicate, recurved tentacular appendages. Last 2 segments of metasome 

 confluent. Urosome with the genital segment in female comparatively short and 

 scarcely at all protuberant below. Caudal rami narrow and elongated, being 

 remarkably divaricate, and in some cases asymmetrical, setse comparatively short 

 and present in the normal number, the outermost one being attached to the outer 

 edge at some distance from the others. Eye very small. Anterior antennae 

 slender and elongated, composed in female of 24 articulations only, the last 2 

 being confluent. Posterior antennae with the outer ramus scarcely longer than 

 the inner, and 7-articulate. Anterior lip not much prominent, rounded below. 

 Oral parts of quite normal structure. Natatory legs with the inner rami com- 

 paratively small and biarticulate; 2nd to 4th pairs with the first 2 joints of the 

 outer ramus imperfectly separated in female, terminal joint with 3 spines outside, 

 apical spine coarsely serrate. Last pair of legs in female very small, 3-articulate, 

 first 2 joints simple, last one dentate at the tip; those in male very asymmetrical, 

 left leg much the larger, 4-articulate, and distinctly forcipate, 2nd joint being 

 produced inside to a long curved thumb-like process, against which the outer part 

 admits of being impinged; right leg 3-articulale, with the terminal joint unguiform, 

 incurved. No ovisac present in female. 



