NO. 2063. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 717 



cephalothorax by a distinct groove; no abdomen, anal laminae, or 

 posterior processes; genital process so rudimentary as to be scarcely 

 visible; egg strings cylindrical and plump. 



First antennae three-jointed; second antennae biramose, both 

 rami unsegmented, and unarmed. First maxillae tripartite, the 

 palp with one spine; second maxillae short and stout, entirely sep- 

 arate and each maxilla attached separately to the host, or to a com- 

 mon bulla. Maxillipeds with a swollen basal joint, which is unarmed, 

 and a slender termmal claw. 



Generic characters of male. — Cephalothorax longer than the trunk 

 and the two separated by a distmct constriction; head covered with 

 a dorsal carapace; trunk bent in a half circle so that the posterior 

 end points toward the head;*'iio anal laminae or traces of segmenta- 

 tion. First antennae three-jointed ; second antennae uniramose, 

 tipped with a curved claw. First maxillae bipartite, without a palp; 

 second maxillae a little larger than the maxillipeds, both tipped with 

 stout claws. (See pi. 28, fig. P.) 



Type. — EuhracJiiella antarctica (BrachieUa antarctica Quidor). 



(Euirachiella, Ed and BrachieUa.) 



Remarlcs.— This genus is distinguished by the fact that the female 

 has no posterior processes, the rami of the second antennae are un- 

 segmented, and the second maxillae are either entirely separate or 

 are separately attached to a common bulla. The male differs even 

 more, and shows a condition about half way between a typical 

 BrachieUa male and that found in the genus Clavella and its near 

 relatives. The body has been folded upon itself until the posterior 

 end of the trunk points as directly forward as in Clavellodes, but there 

 has been no fusion, and the trunk is clearly differentiated from the 

 cephalothorax; and according to Quidor the second anteimae are 

 uniramose and terminate in a prehensile claw. The genus includes 

 two species, both obtamed in the antarctic by the French expedi- 

 tions under the command of Jean Charcot. 



TABLE OF SPECIES. 



1. Trunk quadrilateral, first maxillae tripartite antarctica (Quidor), 1906. 



1. Trunk obcordate, first maxillae bipartite gaini (Quidor), 1912. 



BIBLIOGRAPHY. 



The following are referred to in the present paper: 



1794. Abildgaard, P. C. Beskrivelse af en Gjelleorm paa Brasens Krop, Lernaea 

 anomala. Skrivter af Naturh. Selsk., Kjobenhavn, vol. 3, pp. 57, 58, un- 

 numbered plate. 



1909. Bainbridge, May E. (Hon. Mrs. Henn Collins). Notes on some Parasitic 

 Copepoda; with a Description of a New Species of Choiidracanthus. Trans. 

 Linnean Soc, London, ser. 2, Zool., vol. 11, pt. 3, pp. 45 to 60, pis. 8-11. 



1850. Baird, William. The Natural History of the British Entomostraca. The 

 Ray Society, London, 1850. 



