128 ME. G. S. BEADY ON THE CEUSTACEAN FAUNA OF THE 



joint of the inferior antennae bearing on the upper margin a row 

 of eight curved setae, gradually increasing in length from the first 

 to the last. Mandibles broad at the base. Second pair of foot- 

 jaws feeble and sparingly setose. Fifth pair of feet bi-articulate, 

 cyHndrical, first joint short, bearing one long seta, the last joint 

 bearing one long and one short terminal seta. First abdominal 

 segment bearing a small laminar appendage or rudimentary foot, 

 which has four unequal terminal spinous seta3. Caudal segments 

 very long and narrow, nearly four times longer than the preced- 

 ing abdominal segment, and above half the length of the longest 

 apical seta. Length, -aVth of an inch.''' 



Hab. — In pools of brackish water, near the edge of the Slake 

 at Hartlepool, June, 1866. 



This species is very closely allied to Cyclops insignis, Claus ; 

 but the setose armature of the upper antennte, and the conform- 

 ation of the rudimentary feet, are both strikingly different. The 

 foot-jaws also seem to be much weaker, and less robustly spined. 

 The form and proportions of the joints of the tail and upper an- 

 tennas of C. insignis, as figured by Claus {Weigmann's ArcJiiv., 

 1857) are, hoM^ever, precisely similar to those of the present spe- 

 cies. The only Entomostraca which occurred in company with 

 it were Temora velox and Tacliidius hrevicornis, both purely brack- 

 ish water species. I have pleasure in inscribing this species to 

 Sir John Lubbock, an author who has contributed largely to our 

 knowledge of this order. 



Cyclops ^quoeeus, Fischer. (Plate IV., figs. 9-16). 



Cyclops (Bquoreus, Fischer. Abhandl. der Akad. der Wissen- 

 schaft, Miinchen (1860), Band 8, p. 654, T. XX., figs. 26- 

 29. 



Upper antennae of the female six -jointed, short and stout, ra- 

 ther densely setose along the upper margin ; fourth joint the 

 longest, third and fifth both very short, the sixth nearly as long 

 as the fourth, and terminating in four setas. Lower antennte 



* This is in all cases exclusive of the tail setre. 



