NO. 2194. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 47 



with their basal joints large, considerably inflated, and fused only 

 at their origin, Avhile the terminal claws are stout, strongly curved, 

 and folded downward and inward against the basal joints and toward 

 each other. 



The proboscis is as long as the neck and of medium diameter, some- 

 what narrowed at the tip with an intricate supply of muscles for 

 retraction and protrusion. The mouth opening is terminal and cir- 

 cular and is surrounded by a delicate fringed membrane. The first 

 maxillae arc minute and one-jointed, tipped with a small seta and 

 situated on the sides of the proboscis just at the base of the terminal 

 narrowing. The second pair are also on the sides of the proboscis, 

 posterior and ventral to the first pair; they are slender and two- 

 jointed, the terminal joint half the length of the basal and tipped 

 with a short curved claw. Only the basal plates are present in the 

 four pairs of legs, the rami having disappeared; these plates are 

 notched on the outer margin near the distal end. 



Total length, 9 mm. Trunk, 7.50 mm. long, 2 mm. wide. Egg 

 strings, 17 mm. long, 0.50 mm. wide. 



Color (preserved material). Head and neck a grayish yellow, 

 trunk a dark cinnamon brown, egg strips a lighter brown. 



(clavatus, club-shaped.) 



Remarks. — This species was originally described by INIiiller and re- 

 ferred to the genus Lernaea^ but when Kr0,yer rediscovered it he 

 recognized at once that it did not belong to that genus but to Nord- 

 mann's Peniculus. 



Claus suggested (18GS, p. 12) that Kr03'er's clavatus and Nord- 

 mann's fistula were the same species, but the present description and 

 figures make it certain that the two species are distinct. The general 

 body proportions are very dill'erent, as can be seen from the key 

 (p. 4G), especially the length of the proboscis and trunk, the width 

 of the fourth segment, and the relative size of the abdomen. These 

 ditFerences are carried still farther in the details of the appendages, 

 none of which correspond with those given by Claus for fistula. 



Claus recorded that the first antennae were broken on all the 

 specimens at his disposal, but fortunately they were present on 

 several of the present specimens and are given in detail in figure 3. 



As distinctive characters in the internal anatomy of this species 

 we may notice the comparatively narrow OA'iducts and wide cement 

 glands, the glandular portion of the latter being actually wider 

 than the oviducts and distinctly segmented. The ovaries also are 

 short and broadly ovate or heart-shaped. 



PENICULUS FISSIPES, new species. 



riiito 2, fij,'s. S-14. 

 Ilost and specimens. — Seven females were obtained from tlie fins 

 of an unknown fish by the United States Bureau of Fisheries 



