THORELLIA. 95 



Genus 3. THOEELLIA, Boeck (1864). 



(Thorellia, Boeck, Oversigt, &c., 1864. Cyclops, Norman, 1868. ? Eurytc 

 Philippi, Weigmann's Archiv, 1843.) 



Body cyclopoid in shape. First pair of antennaB 

 much shorter than the cephalothorax, many-jointed ; 

 second pair 4-jointed, unbranched. Mandibles, maxillse, 

 and first pair of foot-jaws as in Cyclops. Second pair of 

 foot-jaws (PL XYI, fig. 8) 4-jointed, and forming a pre- 

 hensile limb terminating in two uncinate claws. First 

 four pairs of feet 2-branched and adapted for swimming, 

 each branch 3 -jointed. Fifth pair of feet rudimentary, 

 composed of a single branch. 



1. THORELLIA BRUNNEA, Boeck. PI. XVI, figs. 1 10. 



Thorellia brunnea, Boeck. Oversigt over de ved Norges Kyster 



iagt. Copep., p. 26 (1864). 

 Cyclops nigricauda, Norman. Last Shetland Dredging Report, 



p. 295 (1868). 

 pallidus (young). Idem, ibidem, p. 295. 



First pair of antennae in the female (fig. 2), 21-jointed, 

 much shorter than the first cephalothoracic segment 

 (which consists of the head fused with the first seg- 

 ment of the thorax) ; first joint much the largest, 

 second equally wide but much shorter ; following 

 seven joints very short in proportion to width ; next 

 ten about as broad as long ; last joint more than twice 

 as long as broad ; the whole limb beset on its upper 

 margin with long setse : in the male (fig. 3) the 



