624 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



differentiation of the fifth and sixth legs in both sexes are characters of 

 the genus Lepeophtheirus. The presence of well developed plates on the 

 dorsal surface of the fourth segment and their rudiments even in the 

 male, the structure of the second antennae, and the jointing of the sec- 

 ond maxillae with the rudimentary endopod on the basal joint are 

 characters of the Euryphoringe. 



If we classify this genus with the Caligina^ it will be the only one pos- 

 sessing any of these characters belonging to the Euryphorinie. On the 

 other hand, if we classify it with the latter subfamily it will stand 

 equally alone in the possession of lunules and in the structure of the 

 mouth tube. 



That it really belongs with the Caliginae is clearly indicated when we 

 come to consider its ontogeny. Both sexes show plainly, even in the 

 adult, the glands and remains of the frontal filament by which the 

 chalimus is fastened during its transition to the adult form. 



With the other characters somewhat evenly divided this would turn 

 the decision, even if it did not possess greater value than they. We 

 have here, then, agenusundoubtedly belonging to the Caliginae, as its 

 development and general makeup clearly indicate, yet possessing sev- 

 eral of the essential characters of the Euryphorinae. While embraced 

 within the first subfamily, therefore, it must be recognized as standing 

 on the border line between the two. It is another of those instances 

 which show that even the best efforts of the systematist can not hope 

 to clearly differentiate all the forms that present themselves for con- 

 sideration. 



In addition to the foregoing new and rediscovered species belonging 

 to the Caligina?, many others were found. 



The simplest method of recording these is to present an alphabetical 

 list of the fish examined with the parasites found on each. They were 

 all obtained in the immediate vicinity of Beaufort. 

 Archosargus probatocephalus Walbaum. The Sheepshead. 



An undescribed species of Bomolochus from the walls of the gill 

 • cavit}^, and an undescribed species of Lernanthrojjus from 

 the gill filaments. 

 Bairdiella chrysura Lacepede. Mademoiselle: Yellow-tail. 



An undescribed species of Ler7iantliropvs from the gills. 

 Brevoortia tyrannus (Latrobe) Goode. The Menhaden. 



Lernaeeniciis radiatus Rathbun, imbedded in the tiesh, mostly 

 along the back. Lernanthropus hrevooriun Rathbun, fastened 

 to the gill filaments. Anchorella scombri Kroyer, fastened to 

 the gill arches. 

 Carcharias obscurus Le Seur. Dusky Shark. 



PiutdaruH cranchii Leach, on the outside skin near the lips. 

 Centropristes striatus Linn^us. The Blackfish. 



Caligus hsemulonis Kroyer, on the vvalls of the mouth cavity. 



