62 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 63. 



tailed descriptions, so that the present account must be credited to 

 him practically in its entirety. 



The two figures of the adult female were drawn by J. H. Blake and 

 are by far the best that have ever appeared of the species, since they 

 show a wealth of detail which is specifically accurate. 



Mr. V. N. Edwards of the Bureau of Fisheries' station at Woods 

 Hole, who collected most of the specimens of this species mentioned 

 above, told the author that it was very common in the spring when 

 menhaden are abundant, but is found only occasionally during the 

 summer when these fish are much less plentiful. 



The parasite is found on the sides and back of its host, usually not 

 far from, and often quite close to, the dorsal fin, and is sometimes 

 attached to the throat under the tongue, or to the edges of the opercu- 

 lum. They bury deeply in the flesh, with the cephalic horns wrapped 

 around some portion of the bony framework of the fish, or held firmly 

 between two bony plates of the operculum, and they make a bad sore. 



The species can be readily recognized by the radiating cephalic 

 horns, the large fleshy proboscis, and the projecting second antennae, 

 which stand out prominently from the anterior margin of the head. 

 The number of horns as well as their arrangement varies consider- 

 ably, but a careful examination of all the oddities in the 200 speci- 

 mens belonging to the United States National Museum failed to 

 reveal a single one that could be separated specifically. They all 

 possessed the same large fleshy proboscis, projecting second antennae, 

 and swimming legs. 



Consequently the new genus " Lerncoceropsis " proposed by 

 Fowler in his Crustacea of New Jersey (p. 92) can hardly stand, since 

 the only point in which it diiTcrcd from raditaus was in the possession 

 of two extra horns on the sides of the neck. There are at least a 

 dozen such specimens in the National Museum collection from the 

 same host that Fowler mentioned, but every one of them belongs 

 to the present species. Furthermore, Fowler's specimens show their 

 likeness ("ojisis") not to Lernaeoccra but to Lernaeenicus. 



LERNAEEMCUS POLYCERAUS, new species. 



Plate 5, figs. 42-47. 



Host and record of specimens. — Two specimens were obtained 

 from the red goat fish, Upeneus maculatus by Dr. Edwin Linton 

 at Beaufort, North Carolina, in 1902, and are numbered Cat. No. 

 47807, U.S.N.M. A third specimen was obtained by Mr. V. N. 

 Edwards from the tomcod, Microgadus tomcod^ at Woods Hole in 

 1885. It has been given Cat. No. G147, U.S.N.M., and is made the 

 type of the species, the two others becoming paratypes. 



