220 BRITISH ENTOMOSTRACA. 



Ctclops LACiNULATUS, ilUller, Zool. Dan. Prod., No. 2410, 1776 ; 

 Eutomost. 105, t. 16, f. 4-6. 



— Ramdohr, Beyt. zur Naturg., 7-9, t. 2, f. 4-12. 



— Latreille, Hist. Nat. Crust., iv, 266. 



— Bose, Mau. Hist. Nat. Crust., ii, 258. 



— Baird, Trans. Berw. Nat. Club, i, 97. 

 MoNOCULtis LACINULATUS, Manuel, Enc. meth., t. 264, f. 15-] 7. 



— Gmelitt, Linn. Syst. Nat., 2997, No. 14. 

 Cyclops rubens, Miiller, Entomost., 104, t. 16, f. 1-3, 1781. 



— Latreille, Hist. Nat. Crust., iv, 266. 



— Bosc, Man. Hist. Nat. Crust., ii, 258. 



— Baird, Trans. Berw. Nat. Club, i, 97, t. 2, f. 2 (the 



young). 

 MoNOCULUS RUBENS, Falricius, op. cit. 



_ Manuel, Enc. meth., t. 264, f. 10, 11. 



_ Gmelin, Linn. Syst. Nat., i, 2997, No. 13. 



DiAPTOMUS Castok, Westwood, Partington's Cyclop. Nat. Hist., art. 



Cyclops, 1836. 

 DisPTOMUS Castor Baird (misjirint). Trans. Berw. Nat. Club, i, 97, 

 1835 ; Philosophical Transactions, No. 288, 

 1703, f. 6 of accompanying plate. 



— Baker, Microsc. made Easy, 93, t. 9, f. 2. 

 Cyclopsina Castor, M. Edwards, Hist. Nat. Crust., iii, 427,1840. 



— Baird, Trans. Berw. Nat. Club, ii, 154, 1845. 

 Glaucea RUBENS, Kocli, Dcutsch. Crust., h. xxxv, t. 4 (male), t. 5 



(female). 

 Glaucea c^rulea, Koch, 1. c, xxxv, t. 6. 



Description. — The head may be easily distinguished 

 from the body, though it is firmly articulated with the 

 first segment of the thorax. 



The thorax consists of five rings, the first being consi- 

 derably the largest. 



The abdomen is composed, of five articulations also, the 

 last being divided at extremity into two lobes, each of 

 which gives origin to five plumose setae. 



The eye is large, of a fine ruby colour ; and we can 

 distinctly see the muscles which move it, and of M^hich 

 there are several. 



The antennae are large organs, of great length, and 

 strong. They are formed of about twenty-six articulations, 

 each furnished with one or more setae, the last terminated 



