480 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



chUeiisls^ from Lota, Chile, and Jlomo'iotex p<dVi(da. the, type of a new 

 genus, locality unknown. 



In addition to thi^'se seventeen new species the present paper gives 

 for the tii-st time the de\'el()})nient stages of two species, t'dJujiis rapa.v 

 and C. ciniiix; almost the (>ntire anatomy of a third, EcJietns fijpicux 

 Kroyer, while it corrects or largely supplements the anatomical 

 details and rectifies the systematic position of seven other species, 

 C((l!(/ns jK'hinn/(l!s Kroyer, ('. j>f(>(lii<-f nx Dana, C tJii/nni! Dana, Lepe- 

 (>2>htli('triis fJiontjixoiu Y^'Aivd, L. saluKiiuK Ivrcyer, L. j>((<'!fci(s {j'ih^Xqx^ 

 and (_'(ill<jiis ct'iitrodoDfi Baird, the last a non-American species. 



Here also are presented foj- the first time a comparative anatomy of 

 the di lie rent species of (\(J!<jiih and Lej)c(>p/it/ieh'u-s, and artificial keys 

 for the determination of all known species under the several genera. 

 In the development are given for the lirst time tiguivs of a metanau- 

 plius and the details of its anatomy. And there is introduced the first 

 continuous life history of any species belonging to the family, together 

 with a comparison of fhe life histories of several species and at least 

 two genera. 



This subfamily, the Caligina', is particularl}' interesting l)ecause the 

 genus Calignx^ which is the type of the entire famil3% is one of the 

 oldest among the parasitic copepods and formerly included many 

 species which are now referred to other genera. Among these were 

 some which resembled the true ('(tl/jjus verv closely, except that they 

 lacked the lunules or sucking disks on the frontal plates. From these 

 Van Nordmann credited the geinis Lepcajf/itlu inis in 18^2, but it was 

 not geiuM'ally acce})ted at first, and the species of both genera continued 

 to be included under CdJujnx ly many authors uj) to the ap})earance of 

 KWiyer's excellent memoir in iSdS. 



The genus _L;;ryvYcw also was first placed by KoUar under Callguf^ 

 in the collection of the Vienna Museum. Like Lepcoplttln h'tis'xt lacks 

 the lunules on \\w frontal plates, and hence Ki'oyer, who was the first 

 to })ublish a description of the species, classified it as a L( pcoplitlicrnix., 

 and it was not until ls«;5 that it was established as a distinct genus l)y 

 Heller. 



Of the other two genera, one, Cdllgodcx^ is simply a CaHgus \\\{h 

 the free segment elongated into a neck and the genital segment and 

 abdomen modified slightly, while the appendages are identical in the 

 two. The other genus is the new one IToinoiotex^ and diU'ers only in 

 having the genital segment covered with a dorsal plate. It has not 

 thus far been found in North American waters, but there is (n-(ny 

 pr()bal)ility that it will be at some future time. 



These genera are very closely related to one another therefore, and 

 since both the males and females of all exce})t Oal/godrs can swim about 

 freely the}" furnish an excellent group to contrast with the Argulidfc 

 on the one side and the Pandarime on the other. The Argulid.e are 



