THORELLIA. 95 



Genus 3. Thoeellia, Boech (1864). 



{Tlwrsllia, Boeck, Oversigt, &c, 1864. Cyclops, Norman, 1868. ? Eurytc 

 Philippi, Weigmann's Archiv, 1843.) 



Body cyclopoid in shape. First pair of antenna 

 much shorter than the cephalothorax, many-jointed ; 

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

 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. Thoeellia brunnea, Boech. PL 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 antennse 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 setge : in the male (fig. 3) the 



