CYCLOPS. 115 



11. CYCLOPS HELLERI, Brady. PI. XXII, figs. 1518. 



/ Cyclops Clausii, Heller (1871). Untersuchungen iiber die 

 Crustaceen Tirols, p. 7, taf . i, figs. 1, 2 (not 

 Cyclops Clausii, Lubbock. Trans. Linn. 

 Soc., vol. xxiv, part 2) (1863). 



Anterior antennae (fig. 15) 10- (?) jointed, reaching 

 beyond the first cephalothoracic segment ; the sixth 

 and seventh joints larger than the rest. Both 

 branches of the first four pairs of feet 3-jointed ; last 

 joint of outer branch in first and second pairs having 

 three spines, those of the third and fourth pairs only 

 two, on the outer margin ; first and second joints in 

 all cases having only one external spine. Fifth foot 

 (fig. 17) 2-jointed; basal joint wide and bearing one 

 long seta, apical joint smaller, bearing one long seta 

 and one short spine. Lower abdominal segments 

 pectinated with fine marginal serratures; caudal 

 rami about equal in length to the last three abdo- 

 minal segments ; setae about equal in length to the 

 abdomen, and finely plumose. 



I am not by any means sure that the species here 

 described is identical with that of Heller, though if 

 not so it is certainly closely allied to it, as well as to 

 C. Kaufmanni, Uljanin ; the anterior antennas corre- 

 spond, indeed, more exactly with those of the latter 

 species (being apparently 10-jointed, while those of 

 C. Clausii, according to Heller, have eleven joints) ; 

 but on the other hand the fifth pair of feet agree more 



