094 PROCEEDINGS OF THE NATIONAL MV8EVM. vol. 47. 



body stands at an angle of about 45° with the anterior portion, and 

 the genital process and appendages stand at the same angle. 



TABLE OF SPECIES. 



1. First antennae armed with stout spines, rigid, and projecting in front of the head; 

 egg strings at an angle of 45° with the trunk axis, .spinosa, new species, p. 694. 



1. First antennae well armed, but flexible and not projecting in front of the second 



pair; egg strings parallel with trunk axis 2. 



2. The trunk spherical or ovoid and without any posterior invagination at the center. 3. 



2. The trunk flattened dorso-ventrally and emarginate posteriorly at the center 4. 



3. Cephalothorax more than three times the length of the trunk; the latter spher- 



ical scombri (Kurz), 1877. 



3. Cephalothorax only one-half longer than the trunk; the latter ovoid. 



ovalis (Kr0yer), 1837, p. 696. 



4. Cephalothorax twice the length of the trunk; the latter subrectangular in out- 



line emarginata (Kr0yer), 1837. 



4. Cephalothorax only one-third longer than the trunk; the latter heart-shaped. 



cordata, new species, p. 697. 



CLAVELLISA SPINOSA, new species. 



Plate 50, figs. 188 and 189; plate 52, fig. 200. 



Host and record of specimens. — Eight specimens, including both 

 sexes, were obtained from the gill rakers of the menhaden, Brevoortia 

 tyrannus, at Beaufort, North Carolina, August, 1905. They have 

 received Cat. No. 39556, U.S.N.M. One female was obtained by 

 Doctor Linton from the same host and locality, and has received 

 Cat. No. 39612, U.S.N.M. Five females and two males were taken 

 by Dr. M. T. Thompson from the same host at Woods Hole, Massa- 

 chusetts, August 6, 1901, and have received Cat. No. 39803, U.S.N.M. 

 A single female from the first Beaufort lot, carrying an attached male 

 on the side of the neck, is made the type of the new species, and is 

 given Cat. No. 43547, U.S.N.M. 



Specific characters of female. — Cephalothorax proportionally slen- 

 der, from three to five times the length of the trunk, tapering from 

 the trunk toward the head, and turned back so that its dorsal sur- 

 face rests against that of the trunk; head not enlarged, but strongly 

 narrowed anteriorly, where it terminates in three projections made 

 up of the antennae and the mouth tube, covered dorsally with a 

 fairly distinct carapace; neck usually profusely wrinkled; trunk 

 nearly twice as wide as long, flattened on the dorsal surface, and kid- 

 ney- or bean-shaped, the arms extending from the eye of the beau; 

 the swollen sides of the trunk are filled with the convolutions of the 

 oviducts and increase in size and convexity with the maturing of 

 the eggs; no abdomen, anal laminae, genital or posterior processes; 

 egg strings ellipsoid or kidney-shaped and attached not by one end, 

 but near the middle of one side, causing them to stand at an angle of 



