644 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvin. 



a .salmon (probably the "blue-back salmon," OiicorJiijiiclnis ucrl'a) 

 inhabiting Puget Sound, on the Pacitic coast. 



Tiiey were descri])e(l by him as a new species." lie called the 

 species a Oaligns^ but that does not seem possible after a careful study 

 of his description and text ligures. 



There are no lunules on the frontal plates and the second maxilhe 

 are bifurcated for one-third of their length, ])oth of which are charac- 

 teristics of the genus Lepeoplitlu'ii'us as distinguished from Caligu.s. 



From correspondence with Gissler it was ascertained that his type 

 specimens had been turned over to the American Museum of Natural 

 Histor}' at New York Cit}". 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 ])e found. The species will have 

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

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

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

 the tigures 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 al)do- 

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

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

 acid. 



There may l)e a suggestion in this that some species, like salmon is^ 

 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 Sainton is, but the size and 

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

 every one of the append;iges given ])y Gissler, particvdarlv the second 

 anteniue and the fourth legs. 



LEPEOPHTHEIRUS COSSYPHI Kroyer. 



Plate XXV, figs. 311-313. 



Lepeophtheirnf! rofn^ijphi Kkoyer, 1S()3, p. 115, pi. vii, 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 anteriorl3\ Frontal plates medium 

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

 segment very narrow and short, considerabl}' 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, squareh' truncated posteriorly. The cornei's 

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



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



