42 



PKOCEEDIlSrGS OF THE NATIONAL MUSEUM. 



VOL. 60 



mose, three-fourths as long as the whole body, rather stout and bluntly 

 rounded at the tips. Anal laminae slender and filiform, four times 

 as long as wide, each tipped with two tiny setae. 



Color (preserved material), a uniform yellowish brown. 



Total length, 1 mm. Cephalothorax 0.40 mm. long, 0.35 mm. wide. 

 Fourth legs, 0.72 mm. long. 



{leidyi, to Dr. Joseph Leidy, one of the early American pioneers in 

 the study of the Crustacea.) 



Remarks. — This new species is especially distinguished in the fe- 

 male by the long and slender fourth legs and by the shortness of the 

 dorsal plate, which shows the anal laminae and sometimes a portion 

 of the abdomen. In the male the best mark of recognition is the large 

 squarely truncated cephalothorax and the greatly reduced third legs. 

 The latter scarcely show in dorsal view and are so reduced as to be 

 easily overlooked. The species is fairly common, and many speci- 

 mens can often be obtained from a single fish. 



LEENANTHROPUS POMATOMI Rathbnn. 



Lemanthropus pomatomi R. Rathbun, Proc. U. S. Nat. Mus., vol. 10, 1887, p. 

 567, pis. 33-35. — M. J. Rathbun, Occasional Papers, Boston Soc. Nat. 

 Hist., vol. 7, 1905, p. 98. 



Mr. Richard Rathbun established this species in 1887 for more than 

 one hundred specimens taken from the gills of biuefish Pomatojnus 

 saltatrix Linnaeus, caught in Vineyard Sound in 1883 and 1885. He 

 published a complete description of both sexes, accompanied by ex- 

 cellent figures, in the reference given above. 



A few specimens were found at Beaufort, North Carolina, by the 

 present author in 1905, and from one of the females, whose eggs were 

 just ready to hatch, many nauplii were secured. These were examined 

 at the time and differed considerably from the one in figure 57. 



The following is a list of the specimens at present in the collection 

 of the United States National Museum, including those obtained by 

 Rathbun : 



