COPEPODA. 



435 



1. Sub-order: Eucopepoda. 



Copepoda with swimming feet, the rami of which are two or three 

 jointed. They have biting or piercing and sucking mouth parts. 



1. Gnathostomata. For the most part non-parasitic; oral apparatus 

 adapted for mastication ; fully segmented body. 



Fam. Cyclopidae. Mostly fresh- water animals, without a heart, and with a 

 simple eye. The second pair of antenna? are four-jointed and never biramous. 

 The feet of the fifth pair are rudi- 

 mentary in both sexes. The male 

 employs the anterior antennae for 

 prehension. Cyclops coronatus 

 Cls., Cantlwc ampins minutus Cls., 

 liarpactlcus clidlfer 0. Fr. Mull., 

 North Sea. 



Fam. Calanidae. The anterior 

 antennas are very long, only one 

 of them is modified for prehension. 

 The posterior antenna? are bira- 

 mous. Heart always present. The 

 feet of the fifth pair are, in the 

 male, modified to assist in copula- 

 tion. Cetoclillus SL'ptentrionalis 

 Goods., Diaptomus castor Jur. 

 IrencBiis Patersonii Tempi. 



Fam. Notodelphyidae. Structure 

 of body like that of the Cyclopidcc. 

 The posterior antenna? modified 

 for attachment. The two last tho- 

 racic segments are fused in the 

 female and form a brood cavity for 

 the reception of the eggs. They 

 live in the branchial cavity of As- 

 cidians. Notodclpliys agilis Thor. 



2. Parasita* (Siphonosto- 

 mata). Mouth parts adapted 

 for piercing and sucking, 

 usually with incomplete seg- 

 mentation of the body and 

 reduced abdomen. 



The posterior antennae and 

 niaxillipeds end with hooks 

 for attachment. Some of 



GoJm 



FIG. 34,6. Lcrnaa branckialii. a, Male (abotif, 

 2 to 3 mm. long). Oe, Eye; G t brain; T, 

 testis ; M, stomach ; F 1 to F ir , the four pairs 

 of swimming feet ; Sp, spermatophore sac. b, 

 Female (5 to 6 mm. long at the time of 

 copulation). A', A", the two pairs of an- 

 tennas; Z>, intestine; R, proboscis; Mxf, 

 maxilliped. c, Female of Lerneea branchialis 

 after copulation undergoing metamorphosis ; 

 d, the same with egg sacs, natural size. 



* Besides Steenstrup and Liitken I.e. compare A.v. Nordmann, " Mikro- 

 graphische Beitrage zur Naturgeschichte der wirbellosen Thiere," Berlin, 1832. 

 H. Burmeister, " Beschreibung einiger neuen und wenig bekannten Schmarot- 



