220 
BRITISH ENTOMOSTRACA. 
Cyclops lacinulatus, Muller , Zool. Dan. Prod., No. 2410, 1776 ; 
Entomost. 105, t. 16, f. 4-6. 
— Ramdohr , Beyt. zur Naturg., 7-9, t. 2, f. 4-12. 
— latreille , Hist. Nat. Crust., iv, 266. 
— Bose, Man. Hist. Nat. Crust., ii, 258. 
— Baird, Trans. Berw. Nat. Club, i, 97. 
Monoculus lacinulatus, Manuel, Enc. meth., t. 264, f. 15-17. 
— Gmelin, Linn. Syst. Nat., 2997, No. 14. 
Cyclops rubens, Muller, Entomost., 104, t. 16, f. 1-3, 1781. 
— Latreille, Hist. Nat. Crust., iv, 266. 
— Bose, Man, Hist. Nat. Crust., ii, 258. 
— Baird, Trans. Berw. Nat. Club, i, 97, t. 2, f. 2 (the 
young). 
Monoculus rubens, Fabricius, op. cit. 
— Manuel, Enc. meth., t. 264, f. 10, 11. 
— Gmelin , Linn. Syst. Nat., i, 2997, No. 13. 
Diaptomus Castor, Westwood, Partington’s Cyclop. Nat. Hist., art. 
Cyclops, 1836. 
Disptomus Castor Baird {misprint'), 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. Fdwards, Hist. Nat. Crust., iii, 427,1840. 
— Baird, Trans. Berw. Nat. Club, ii, 154, 1845. 
Glaucea rubens, Koch, Deutsch. Crust., h. xxxv, t. 4 (male), t. 5 
(female). 
Glaucea c^erulea, 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 which 
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 
