R0.2194. NORTH AMERICAN PARASITIC COPEPODS—niLSON. 55 



CARDIODECTES BELLOTTII (Richiardi). 



Plate 21, figs. IGl and 1G2. 



Pcrodcrma hcUottii Hicui^vedi, Atti della Soc. Tose. Processl Verbal!, voL 



3, 1SS2, p. 149. 

 Perodcrma bcUuttii Jungeksen, Vid. Medd. fra den Naturh. Foren., Kl^ben- 



luivu, vol. C4, 1011, pp. 11 and 13. 



riost and record of specimens. — Two specimens of Scopelus glaci- 

 alis, each infested with a single parasite of this species, were kindly 

 sent to the author by Prof. F. E. Jungersen. They were collected 

 by the Danish steamer Thor at the Straits of Gibraltar in 1910. One 

 of the parasites was removed from its host, cleared, and mounted; 

 the other, still attached to its host, has been placed in the United 

 States National Museum, with Cat. No. 49701, U.S.N.M. 



^Specific characters of female. — Cephalothorax ellipsoidal, as wide 

 as long, and smoothly rounded; soft horns on the anterior margin 

 folded and turned inward toward each other; base of posterior 

 horns extending across the second and onto the third thorax segment; 

 each horn is flattened into a soft lamina, projecting ventrally, and 

 somewhat enlarged at the tip; there is no division into lobes and 

 no swollen spheres as in mcdusaeus. 



Frontal processes longer than the others and projecting far in 

 front of the head; those which radiate backward along the ventral 

 surface of the head also project beyond the tips of the posterior 

 soft horns; the entire mass of processes is thus an elongate ellipsoid, 

 a little narrower anteriorly than posteriorl3\ The separate processes 

 are considerably flattened, and are lobed and branched so that they 

 closely resemble the fronds of the common seaweed Fiicus. 



The neck is bent twice as in medusaciis, first dorsally posterior 

 to the base of the soft horns, and again ventrally behind the fourth 

 legs. 



Trunk cylindrical or somewhat spindle-shaped, being widest at 

 the center and narrowing toward the posterior end ; no lobes at the 

 bases of the egg strings; abdomen hemispherical and inclined 

 dorsally, less than a quarter of the diameter of the genital segment; 

 egg strings one half wider than the abdomen and a quarter of the 

 length of the entire body. 



First and second antennae similar to those of mcdusaeus ; probos- 

 cis somewhat larger, but apparently nonretractile; maxillae two- 

 jointed and tipped with a small claw; maxillipeds rudimentary, 

 consisting of a small basal joint tipped with a seta, and situated 

 about halfway between the proboscis and the first swimming legs. 



Four pairs of swimming legs, first two pairs biramose, rami two- 

 jointed, third pair uniramose and two-jointed, fourth pair consist- 



