COPEPODA. 405 



at the base are feathery and have a yellow metallic lustre while the ter- 

 minal one is scarlet. The two divisions of the caudal fork also bear four 

 fan-like feathered appendages almost as long as the body and having a 

 metallic orange colour. The male (I. 13)* is much less strikingly ornamented. 

 The anterior antennae bear very numerous sensory vesicles, and are 

 scarlet at the ends, and the posterior antennae, maxillipeds and the caudal 

 fork bear long narrowly feathered scarlet bristles. In the female of C, 

 plumulosus Glaus (III. 5) * the anterior antennae and caudal fork bear 

 feathered bristles somewhat similar to those of C. pavo, but one of those 

 on the left side of the caudal fork is produced to a length nearly six times 

 that of the body (5 '8 mm.) and beset with orange coloured and clubbed 

 setae, forming a delicate flexible appendage of extraordinary beauty. 

 Clausocalanus Giesb., Ctenocalanus Giesb., Pseudocalanus Boeck, Drepano- 

 pus Brady, Mobianus Giesb., Spinocalanus Giesb., Aetidius Brady, 

 Gaetanus Giesb., Chiridius Giesb., Undeuchaeta Giesb., Euchirella Giesb., 

 Euchaeta Philippi, Scolecithrix Brady, Xanthocalanus Giesb., Phaenna 

 Glaus. 



Fam. 2. Pontellidae (Heterarthrandria of Giesbrecht). One of the 

 anterior antennae of the male, generally the right, modified as a pre- 

 hensile organ. The 5th pair of swimming feet of the female may be 

 reduced but is never absent. The eyes are often large, sometimes with 

 dorsal and ventral cuticular lenses. The last thoracic and anterior 

 abdominal segments of the male are often unsymmetrical. Centropages 

 Kroyer, Isias Boeck, Temora Baird, Pleuromma Glaus, Leuckartia 

 Glaus, Isochaeta Giesb., Disseta Giesb., Heterochaeta Glaus, Hemicalanus 

 Glaus, Augaptilus Giesb., Phyllopus Brady, Candace Dana, Calanopia 

 Dana, Labidocera Lubbock. Pontella Dana, with one pair of eyes 

 provided with cuticular lenses, on the dorsal surface of the head, and 

 additional lenses on the anterior and posterior surfaces of the rostrum. 

 The median ventral element of the eye is also present forming a 

 projection on the ventral surface behind the rostrum. Anomalocera 

 Templeton, with each of the lateral elements of the eye double. 

 Monops Lubbock, Pontellina Dana, Acartia Dana, Corynura Brady. 



Fam. 3. Harpacticidae. Free-swimming. Body linear, cylindrical, 

 completely segmented. Last thoracic segment included in the urosome. 

 Both anterior antennae of the male modified as prehensile organs. 

 Posterior antennae usually biramous and with bent setae. Mandibular 

 palp and first maxilla biramous and short. Maxillipeds ending in 

 a hook. The anterior pair of swimming feet may be modified 

 as an additional pair of maxillipeds, the 5th pair leaflike and alike in 

 both sexes. Heart absent. Eye median, simple. Openings of oviducts 

 near the ventral middle line, and egg sack generally median. Amymone 

 Glaus, Euterpe Glaus, Tachidius Lilljeb., Longipedia Glaus, Canihocamptus 

 Westw. Dactylopus Glaus, Thalestris Glaus, Laophonte Phil., Lillje- 

 borgia Glaus, Jurinia Glaus, HarpacticiLS O. F. Mull., H. chelifer, 

 North Sea. Tisbe Lilljeb., Westwoodia Glaus, Setella Dana, pelagic. 

 Clytemnestra Dana, Ectinosoma Boeck, Sunaristes Hesse, Amenophia 

 Boeck, Stenhelia Boeck, Ameira Boeck, Nitocra Boeck, Mesochra Boeck, 

 Miracia Dana, Metis Phil., Aenippe Phil., Clausia Clap., Euryte Phil., 

 Idomene Phil. 



* Theso numbers refer to the plates and figures in Giesbrecht's Mono- 

 graph on Pelagic Copepods, Fauna and Flora of the Gulf of Naples, vol. 19. 



