xo. 2063. NORTH AMERICAN PARAStTIC COPEPODS— WILSON. 697 



CLAVELLISA CORDATA, new species. 



Plate 26, fig. E; plate 50, fig. 187; plate 52, figs. 201 to 208. 



Host and record of specimens. — Twelve females and four males were 

 obtained by Vinal N. Edwards from the gills of the hickory shad, 

 Pomolohus mediocris, at Woods Hole, October 30, 1903. They have 

 received Cat. No. 39566, U.S.N.M. and become paratjrpes of the 

 new species, 



A single female with attached male was taken from tliis lot and 

 made the species type, with Cat. No. 43539, U.S.N.M. 



A second lot of 20 specimens, including both sexes, was obtained 

 from a single hickory shad at the same locality in September, 1902; 

 they have received Cat. No. 39579, U.S.N.M. 



A tliird lot of 10 specimens, including both sexes, w^as taken from 

 the gills of the alewife, Pomolohus pseudoharengus at Woods Hole, 

 October 5, 1887, and has received Cat. No. 43534, U.S.N.M. 



Two lots, containing three females each, were obtained from the 

 gills of young shad, Pomolohus mediocris, taken in the pound at 

 Woods Hole, July 8, 1875, by A. E. Verrill; they have received, 

 respectively. Cat. Nos. 39622 and 38026, U.S.N.M. 



Three females were obtained by Dr. M. T. Thompson from the gills 

 of the alewife ao Woods Hole, August 10, 1901; they have received 

 Cat. No. 39595, U.S.N.M. 



Specific cliaracters of female. — Cephalothorax longer than the trunk, 

 slender, cyUndrical, and about the same diameter throughout; head 

 not enlarged, but narrowed anteriorly and covered with a dorsal 

 carapace; trunk heart-shaped, of the same width and length, flat- 

 tened dorso-ventrally, narrowed anteriorly, and with a median pos- 

 terior sinus; cephalothorax attached to the dorsal surface of the 

 trunk a Httle in front of the center; egg strings cyUndrical and about 

 as long as the trunk; eggs small, in 8 longitudinal rows, about 20 

 eggs in a row. 



First antennae stout, indistinctly three-jointed, with a tuft of small 

 setae at the tip; second antennae also stout, the terminal biramose 

 portion swollen, turned at right angles to the basal portion and 

 bluntly rounded; exopod one-jointed and armed with a single stout 

 spine, endopod indistinctly two-jointed, with two minute terminal 

 spines. Mandibles with a narrowed neck and a widened blade, armed 

 with five large curved and bluntly rounded teeth. First maxillae 

 with two terminal setae, the palp with a single seta; second maxillae 

 attached at the anterior end of the trunk some distance from the base 

 of the neck, short, cyUndrical, not tapering, squarely truncated at 

 the tips, where they are united by their inner corners; bulla long, 

 slender, and club-shaped. 



