632 CLASS x. 



Family VII. Copepoda LATR., EDW. (Cydopidce BUKM.). 

 Body oval, attenuated posteriorly, terminated by two appendages, 

 as if by a forked tail. Maxillae and foot-jaws various in num- 

 ber, lamellose, setigerous. Antennae two or (in many) four. 

 Natatory feet mostly eight, cloven into two oars. 



This family is very closely allied to Caligus, Ergasilus, and some 

 other genera of the preceding order, from which it is distinguished 

 by the absence of the suctorial beak, and especially by the longer 

 antennae. 



A. Eye single, frontal. 



Cyclops MUELLER (Monoculus L. in part). 



Add sub-genera : Cyclopsina, Arpacticus EDW. and Notodelphys 

 ALLMANN. 



These little animals are to be met with almost every where in water, even 

 in puddles, gutters,- and cisterns of rain-water. The Cyclopsina alpeslrls of 

 C. VOGT was found at a height of 8500 feet in water of the glacier of the 

 Aar; Neue DenkscJir. der allg. Schweizer-Gesellsch. f. d. gesainmt. Natur- 

 wissench. vn. pp. 17 19. 



The young (comp. above, p. 612) have no tail, and a smaller number of 

 feet. The adult female differs from the male in having two oval sacs which 

 she bears about with her, and which are filled with eggs; some species, 

 instead of two, have only a single sac attached to the middle of the body 

 beneath. 



Sp. Cyclops vulgaris LEACH, Monoculus quadricornis L., K,<ESEL Ins. in. 

 Suppl. Tab. 98, MUELL. Entom. Tab. 18, DESMAR. Crust. PI. 53, figs, i 4; 

 very common in almost all fresh water, so that of a certainty every one has 

 often swallowed this little animal. They may be frozen in the water, and 

 after continuing motionless for days, be restored when the water is thawed, 

 after some hours, from their torpor to their former activity. They are 

 ordinarily thickly beset with Vorticellce. The copulation and impregnation 

 have been illustrated by SIEBOLD'S observations 1 . 



B. Eyes two. 



Genera : Pontia EDW., Cetochilus ROUSSEL DE VAUZEME, Hersilia 

 PHILIPPI, Peltidium PHILIPPI, Saphirina THOMPSON, Cananus 

 KROEYER (not LEACH). 



Comp. MILNE EDWARDS Ann. des Sc. nat. Tom. 13, pp. 295 297, PL 

 14 ; ROUSSEL DE VAUZ^ME Description de Cetochilus australis, Ann. des 



1 Beitrdge zur Naturgetch. der wirbellosen Thiere. Danzig, 1839, 4to. pp. 36 50. 



