AKT.5. JSTOETH AMERICAN PARASITIC COPEPODS WILSON. 79 



female. These notes and drawings are here for the first time made 

 public. 



Heller first established this genus with the present species as its 

 type. His two figures, one of the dorsal and the other of the ventral 

 surface, differ in minor details from those here given. The chief 

 difference is in the number of the transverse divisions of the fused 

 posterior body. He represented only 19 of these and left the pos- 

 terior third of the body entirely free as though no divisions existed 

 there. Blake has represented 25 divisions and they extend to the 

 very posterior end of the body. His drawing was made from a 

 living specimen, while Heller had only alcoholic material in which 

 the posterior divisions were no longer visible. 



In two preserved specimens of the present lot, which were cleared 

 in cedar oil after having remained in alcohol for more than 30 years, 

 the divisions are exactly as Blake represented them. 



PSEUDOCYCNUS BUCCATUS, new species. 



Plate 12, tigs. 97-100 ; plate 13, figs. 101-103. 



Host and record of specimens. — Eight females were taken by the 

 author from the gills of a Spanish mackerel, Sco7riberomorus macu- 

 latus, August 13, 1900, at Woods Hole, Massachusetts. One of these 

 has been selected for the species type and has received Cat. No. 



54077, U.S.N.M., while the others become paratypes with Cat. No. 



54078, U.S.N.M. Another lot of five females was obtained from the 

 gills of the cero, Scomberomorus cavalla., at Woods Hole July 29, 

 1887, by Vinal N. Edwards. These have been given Cat. No. 54079, 

 U.S.N.M. 



External specific characters of female. — General body form a nar- 

 row, elongated cylinder. Cephalothorax obovate, considerably wid- 

 ened anteriorly and narrowed posteriorly. Second and third thorax 

 segments free, the same width as the head, the second segment twice 

 as long as the third, both segments with convex lateral margins. 

 Fourth, fifth, and genital segments fused into a cylindrical body five 

 times as long as wide with a uniform diameter. Egg strings about 

 as long as the body and one-third its diameter. Abdomen abruptly 

 reduced to half the diameter of the genital segment, one-jointed; anal 

 laminae short and conical, each tipped with a single seta. 



First antennae minute, cylindrical, indistinctly six- jointed, with a 

 few minute setae on the terminal joint and short bristles scattered 

 over the surface of all the joints. Second antennae three- jointed, the 

 two basal joints moderately swollen, the terminal joint a long curved 

 claw, with an accessory spine or tooth on its concave margin near the 

 center and another much smaller one on the inner margin near the 

 base. Mouth tube conical and close behind the second antennae; 



