PARASITIC COPEPODS—CALia ID J^^ WILSON. 645 



legs. These are conical and thrcc-jointod, with a seta at the end of the 

 first and second joints. 



The abdomen is rudimentary, only one-iMoJith t\w hui<j;th of tiie oenital 

 seg-nient, and looking- like a knol) on its posterior )>order. 



Anal laminie proportionally large, h)nger tlian tlie alxlomen, as wide 

 as long, with stout setie three or four times the length of tiie himiiiiv. 

 i^^^g strings not present. 



floints of the lii'st antennas of about tlie same length and slender; 

 second antenna? of medium size and the usual shape. 



First maxilla small and placed close to the second antenna^ the base 

 swollen more than usual, so that they appear two-jointed. 



Proboscis small and plump, of the same length and width, and 

 squarely rounded at the end. Second maxillw the same length as the 

 proboscis, tolerably stout; the branches pointed and weakly curved. 

 E3^es small and circular. 



First maxillipeds of the lisual form; second pair not as large as 

 usual, and lacking the accessory spine on the terminal claw. 



Furca small, the l)ase squarely truncate, almost rectangidar; the 

 foramen tolerabl}" large and of about the same length and width. 

 Branches not as long as the base, simple, divergent, and pointed, the 

 sinus between them triangular, with the sides almost meeting ante- 

 i"iorl3\ Rami of the third legs close together, but pointing straight 

 backward. Fourth legs elongate, four-jointed, the basal joint as long- 

 as the three terminal ones. 



There are live spines, of wnich those on the second and third joints 

 are equal and of medium size, while of the three terminal spines the 

 middle one is more than twice the length of the other two. 



Total length 3.35 mm. Length of carapace 2.1 mm. ; width of same 

 1.8 mm.; length of genital segment 1.1 mm.; length of abdomen 

 0.125 mm. 



Color not given. 



{cossyjj/u', the generic name of its host.) 



Kroyer bases this new species upon a single female taken from the 

 gills of the Spanish lad3^tish or hogtish, Ilarpe rufa, in the West 

 Indies. But although thus confined to a single specimen, the species 

 presents well-delined characters which serve to distinguish it from all 

 others. 



The first of these characters is the relative proportion of the various 

 body regions. The carapace and genital segment are noticeablj^ large, 

 while the free segment and the abdomen are equally small. The gen- 

 ital segment is also of a peculiar shape, and the fifth legs are unusual l}'- 

 prominent. 



But the crowning mark of distinction, if we may believe Kroner's 

 statement, is the fact that these fifth legs are indistinctl}^ three-jointed. 

 In no other known species of Caligus or Lepeoj)litheiru>i is there any 



