Ko.2194. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 97 



each pair was gone and the remainder of the ventral surface was 

 more or less lacerated, so that if the parasite originally possessed four 

 pairs of legs the two posterior pairs might easily have been destroyed. 

 The discovery of the antennae and mouth parts brings this species, 

 and through it the genus up to a better analogy with the rest of the 

 famil3^ Steenstrup and Liitken, the founders of the genus, examined 

 several specimens which they reported as perfect, but the best they 

 could say of the cephalothorax was that it presented considerable 

 likeness to that of Pennella. They found neither antennae, pro- 

 boscis, nor mouth parts, and as far as is known no investigator since 

 their day has even seen the parasite's head. 



The internal morphology is peculiarly interesting since it shows 

 that, in spite of the sigmoid curvature of the body, there has been 

 no disturbance in the bilateral symmetry. In this particular it pre- 

 sents an important contrast to Phrixocephalus and CoUipravtiSy in 

 both of which there is more or less distortion. 



HAEM0BAPHE3 ENODIS, new ipecie*. 

 Plate 20, figs. 156 and 157. 



Host and record of specimens. — A single perfect female with egg 

 strings was obtained from the gills of Lycodapus ferasfer^ a small 

 deep-sea fish, 4 inches in length, by the Bureau of Fisheries steamer 

 Albatross 11 miles off Point Pinos Lighthouse, on the California 

 coast. May 20, 1904. It is made the type of the new species, with 

 Cat. No. 49702, U.S.N.M. Like all other species of this genus the 

 head and anterior thorax are buried inside the bulbus arteriosus of 

 the host, and there is but a single specimen on each fish. 



Spediic characters of female. — Cephalothorax and the three an- 

 terior free thorax segments about the same width, all four covered 

 with numerous profusely branched cauliflower processes, which do 

 not show any definite arrangement; these give this part of the body 

 a peculiarly rough and swollen appearance; the head, the thorax, 

 and these processes are exceedingly soft and fragile. Neck quickly 

 becoming chitinous and armed with a single pair of short horns in 

 front of the flexure; the portion behind the flexure enlarged in di- 

 ameter and shorter than the portion in front of the flexure. Trunk 

 almost straight with only a hint of the sigmoid curve ; genital segment 

 enlarged to four times the diameter of the neck, the dorsal margin 

 only slightly concave, the ventral margin broadly convex, with no 

 knobs or processes. Abdomen in line with the genital segment, about 

 half the length and width of the latter, the same diameter through- 

 out, and also without knobs or processes. Egg strings loosely coiled, 

 the coils a little wider than the abdomen and about the length of the 

 genital segment. 



77403— Proc.N.M.vol.53— 17 7 



