NO. 2063. ^'ORTH AMERICAN PARASITIC COPEPODfi—WILBO^\ 713 



ness of the second maxillipeds, by the fact that they are held together 

 for theu- entu-e length without being actually fused, and by the long 

 genital process. 



PARABRACHIELLA, new genus. 



Generic characters of female. — Of large size (14 to 17 mm. lono-); 

 cephalothorax of medium length and separated from the trunk by a 

 well-defined groove, cylindrical and flexuose; a more or less distinct 

 carapace on the head; trunk also cyhndrical, somewhat flattened 

 dorso-ventrally, without pits or grooves; one or two pairs of posterior 

 processes and a minute.genital process. 



First antennae four-jointed; second antennae biramose, the exopod 

 with two segments; first maxillae bipartite, the palp with two tiny 

 spines; second maxillae united only at the tips; maxillipeds of the 

 usual form, the terminal claw with two accessory spines on the inner 

 margin. 



Generic characters of male. — Head at right angles with the rest of 

 the body, but so thorougldy fused as to show no trace of separation 

 or segmentation; no dorsal carapace; body strongly inflated, the 

 dorsal surface a semicircle, the ventral surface nearly straight, 

 tapering posteriorly and terminating in two small anal laminae at 

 right angles to the body axis. 



First antennae three-jointed; second antennae biramose, the rami 

 reduced to mere knobs; first maxillae tripartite; second maxillae and 

 maxillipeds relatively very small, close together, and removed a little 

 from the base of the mouth tube. 



Tyije. — Parahrachiella rostrata (BracMella rostrata Kr0yer). 



(Parahrachiella, IJapa, near and Brachiella.) 



Remarks. — This genus includes at present only two species, rostrata, 

 originally described by Kr0yer in 1837 from halibut taken at Kattegat, 

 SiTid insidiosa, described by Heller in 1865 from a Gadus species in 

 the Mediterranean. The former has been noted by numerous writers 

 as found on the halibut along the coasts of Scandinavia, Scotland, 

 and eastern North America. The latter has also been found in 

 various portions of the Mediterranean and around the British Isles, 

 chiefly upon hake, Merluccius vulgaris. 



The female of the genus may be recognized by its large size, by the 

 groove between the cephalothorax and trunk, by the absence of pits 

 and grooves, and by the short posterior processes. 



The male is distinguished by the angulation of the head, and by 

 the fact that the body is neither segmented nor constricted. 



TABLE OF SPECIES. 



1. Only one pair of posterior processes rostrata (Kr0yer), 1837, p. 714. 



1. Two pairs of posterior processes insidiosa (Heller), 1865. 



