COPEPODS OF THE WOODS HOLE REGION 



519 



Figure 



-Clavellisa cordata: a. 

 Female, ventral ; h, male, lateral 



pace. Trunk obcordate, as long as wide, narrowed anteriorly, with 

 a median posterior sinus; ovisacs cylindrical, as long as trunk, at- 

 tached by one end as usual. First antennae 3-segmented; exopod of 

 second antennae 1-segmented, endopod 2-segmented; first maxillae 

 bipartite; second maxillae attached 

 to anterior end of trunk, some dis- 

 tance in front of the base of the neck. 

 Length of cephalothorax, 4 mm.; of 

 trunk, 3 mm. 



M ale. — Body ovoid, relatively 

 shorter than in the preceding species ; 

 head with dorsal carapace. First an- 

 tennae 3-segmented, armed with ordi- 

 nary setae ; second antennae biramose, 

 exopod 2-segmented and tipped with 

 setae, endopod 1-segmented and un- 

 armed; first maxillae bipartite; sec- 

 ond maxillae and maxillipeds slender, with short terminal claws. 

 Total length, 0.25-0.3 mm. 



Remarks. — This parasite is fairly common on the two kinds of 

 fishes mentioned, and can be distinguished from the preceding species 

 by its heart-shaped trunk and smooth neck. 



Genus PARABRACHIELLA Wilson, 1915 



Female. — Neck separated from the trunk by a distinct groove, 

 cylindrical ; head not enlarged, with a carapace. Trunk cylindrical 

 or slightly depressed, with one or two pairs of posterior processes 

 and a minute genital process ; no abdomen or caudal rami. First an- 

 tennae 4-seginented; second antennae biramose; first maxillae bi- 

 partite or tripartite, the palp with two setae; second maxillae united 

 only at their tips ; maxillipeds of the usual form close to the mouth. 



Male. — Head at right angles to axis of trunk, but the whole body 

 so completely fused as to show no distinction of parts ; no carapace ; 

 trunk strongly swollen dorsally, but with a flat ventral surface; a 

 pair of small caudal rami. First antennae 3-segmented; second 

 antennae biramose, the rami rudimentary; first maxillae tripartite; 

 second maxillae and maxillipeds very small, close together, and 

 removed from the mouth tube. A single species in this area. 



PARABRACHIELLA ROSTRATA (Kr0yer) 



Figure 308 



Brachiella rostrata KR0YEai, Naturh. Tidsskrift, vol. 1, p. 207, pi. 2, 1837. 

 Parairachiella rostrata Wilson, Proc. U. S. Nat. Mus., vol. 47, p. 714, pi. 28, 56, 

 1915. 



Ocowrrence. — Both sexes were taken from the gills of a halibut 

 captured on Georges Bank by a Gloucester fishing vessel in 1883. 



