644 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



a salmon (probably the "blue-back salmon," Oncorhynchus nerha) 

 inhabiting Puget Sound, on the Pacific coast. 



They were described by him as a new species/* He called the 

 species a Caligus, but that does not seem possible after a careful study 

 of his description and text figures. 



There are no lunules on the frontal plates and the second maxilla? 

 are bifurcated for one-third of their length, both of which are charac- 

 teristics of the genus Zepeaphtheirus as distinguished from Caligus. 



From correspondence with Gissler it was ascertained that his type 

 specimens had been turned over to the American Museum of Natural 

 History at New York City. Dr. H. C. Bumpus, the director of the 

 museum, very kindly made a careful search for the specimens at the 

 author's request, but they could not be found. The species will have 

 to stand, therefore, upon the original figures and description given by 

 Gissler. Fortunately, these were carefully made and give us definite 

 data to work upon. Nearly everything in the present account and 

 the figures which are herewith presented were taken from Gissler. 

 The species can be readily distinguished by the four-jointed abdomen; 

 no other species in this genus has more than two joints in the abdo- 

 men. However, Gissler states that the segmentation is indistinct in 

 fresh material, and only becomes distinct on being treated with acetic 

 acid. 



There may be a suggestion in this that some species, like sahnonis, 

 just described, in which the abdomen has been hitherto regarded as 

 unsegmented, would show a distinct segmentation if treated in the 

 same way with acetic acid. 



The species bears some resemblance to salmonis, but the size and 

 shape of the genital segment are entirely different, as are the details of 

 every one of the appendages given by Gissler, particularly the second 

 antennas and the fourth legs. 



LEPEOPHTHEIRUS COSSYPHI Kroyer. 



Plate XXV, figs. 311-313. 



Lepeophtheirus cossyphi Kroyer, 1863, p. 115, pi. vn, fig. 6, a-e. — Bassett-Smith, 

 1899, p. 454. 



Female. — Carapace longer than the rest of the body (as 7 to 4), 

 nearly as wide as long, narrowed anteriorly. Frontal plates medium 

 size, not well defined, without any emargination at the center. Free 

 segment very narrow and short, considerably less than one-fourth as 

 wide as the genital segment. 



Genital segment half as long as the carapace, a little wider than long, 

 of a broad acorn shape, squarely truncated posteriorly. The corners 

 are well rounded, and to- them are attached the long and slender fifth 



« American Naturalist, August, 1883, p. 885. 



