070 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



inaxillipeds; figs. 98, 100-102, First, second, tliird, and fourtli swim- 

 ming legs; fig. 99, One of tlie ]>lnmose sette from tlie posterior 

 border of tlie terminal joint of the first legs. All the appendages are 

 from the female. 



Plate IX. Cal'igm aliuncm, new species. Fig. 108, Dorsal view of female; fig. 104, 

 Second antenna; fig. 105, Second maxilla; fig. 106, Furca; fig. 107, 

 Second maxilliped; fig. 108, First swimming leg; fig. 109, Terminal 

 claw of same enlarged to show its serrated border; figs. 110, 111, Third 

 and fourth swimming legs. 



Plate X. ('(digus r(rrt«,s Miiller. Fig. 112, Dorsal view of male; fig. 113, Dorsal view 

 of female; fig. 114, Very young Chalimus, the third thorax segment 

 not fully fused with the head; fig. 115, Fully developed male Chali- 

 mus;. fig. 116, First maxilliped; fig. 1 17, Second maxilliped; fig. 118, 

 Furca; fig. 119, Second swimming leg; fig. 120, First swimming leg; 

 figs. 121, 122, Third and fourth swinnning legs; fig. 123, Second 

 antenna of mule; fig. 124, Second maxilliped of male. 



Plate XI. Cal.i(/iis rliclifcr, new species. Fig. 125, ])orsal \iew of female without egg 

 strings; lig. 126, Dorsal view of female with egg strings, showing 

 difference in shape of genital segment; lig. 127, Second antenna and 

 first maxilla; fig. 128, Second maxilla, showing rudimentary endo- 

 pod; fig. 129, First maxilliped; fig. 130, Terminal claw, or chela, of 

 second maxilliped; fig. 131, Furi'a; fig. 132, First swimming leg; fig. 

 133, Terminal joint of the same, enlarged; fig. 134, Fourth swim- 

 ming leg. 



Plate XII. Calign'i heloucH Kroyer and Odign.^ hilifronx, new species. Fig. 135, Oiliyus 

 belo)tes, dorsal view of female; fig. ]3(), Second antenna; fig. 137, 

 First and second maxilla', and furca; figs. 138 and 139, Third and 

 fourth swimming legs; fig. 140, Caligns hdlfrona, dorsal view of 

 female; fig. 141, Second antenna; fig. 142, Second maxilla; fig. 143, 

 Second maxillii)ed; fig. 144, Furca; fig. 145, First swimming leg; 

 fig. 146, Terminal joint of same enlarged ; figs. 147-149, Second, third, 

 and fourth swimming legs. 



Plate XIII. Vallgus bonito, new species, and Cul.igus pelainydis Kroyer. Fig. 150, 

 Caligus bonito, dorsal view of female with egg strings; fig. 151, dorsal 

 view of female without egg strings, drawn by Richard Rathbun; fig. 

 152, Dorsal view of male, drawn by Richard Rathbun; fig. 153, Pos- 

 terior part of young female, showing the abdomen segments of about 

 equal length; fig. 154, Ccdlgio^ pelaiai/d'ts, dorsal view of female; fig. 

 155, Second antenna; fig. 156, First and second maxilla-; fig. 157, 

 Second maxilliped; fig. 158, Furca; figs. 159-161, Second, third, and 

 fourth swimming legs. 



Plate XIV. Caligus ■productus Dana and Caligus isonyx Steenstrup and Liitken. Fig. 

 161 a. First swimming leg of Caligus pelamydis; fig. 162, Caligus pro- 

 ductus, dorsal view of female; fig. 163, Second antenna; fig. 164, 

 Second maxilla; fig. 165, Furca; fig. 166, Second maxilliped; figs. 

 167-170, First, second, third, and fourth swimming legs; fig. 171, 

 Caligus isonyx, dorsal view of female, after Steenstrup and Liitken. 



Plate XV. North American species of Caligus not in the National Museum collec- 

 tion. Fig. 172, C. balisfae, Steenstrup and Liitken, dorsal view of 

 female; fig. 173, idem, Dorsal view of male; fig. 174, Furca; fig. 175, 

 Second maxilliped; figs. 176, 177, Third and fourth swimming legs; 

 fig. 178, C. thymni'Dana., ventral view of male; fig. 179, Dorsal view 

 of genital segment and abdomen of female; fig. 180, C. Jia^mulonis 

 Kroyer, dorsal view of female; fig. 181, idem, Dorsal view of male; 



