396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



Plate 47. 



Female of Ergasilus mugilis Vogt. 



Fig. 95, dorsal view. Fig. 96, dorsal view of genital segment and abdomen, showing 

 fusion of fifth and genital segments, fifth legs, and musculatm-e of the oviduct 

 openings. Fig. 97, second antenna. Figs. 98 to 101, first, second, third, and 

 fourth swimming legs. 



Plate 48. 



Female of Tucca impressus Kroyer. 



Fig. 102, dorsal view. Fig. 103, ventral view, showing rudimentary third and fourth 

 legs and muscles. Fig. 104, mouth-parts; la., labrum; md., mandible; mx\ and 

 mx^''., first and second maxillge. Fig. 105, second antenna. Figs. 106 to 108, sec- 

 ond, third, and fourth swimming legs. 



Plate 49. 



Male of Tucca impressus Kroyer. 



Fig. 109, ventral view, showing rudimentary swimming legs and muscles connected 

 with them. Fig. 110, side view of female, showing relative thickness of the body. 

 Fig. Ill, genital segment and abdomen of female, ventral ^dew, showing anal 

 laminae and openings of the oviducts. Fig. 112, chitin framework of the cephalo- 

 thorax, after treatment with caustic potash. Fig. 113, cross section of egg-string 

 of female. Fig. 114, second maxilla of male. Fig.. 115, maxilliped. Figs. 116 

 and 117, first and second swimming legs of female of Tucca corpulentus. Figs. 118 

 to 120, thu'd, fourth, and fifth swimming legs of male of Tucca impressus. Figs. 

 110 to 112 were drawn by Richard Rathbun. 



Plate 50. 



Female of Tucca corpulentus, new species. 



Fig. 121, dorsal view. Fig. 122, first antenna. Fig. 123, second antenna. Fig. 124, 

 ventral view of cephalothorax, showing antennae, mouth-parts, and first and 

 second legs in natural position. Fig. 125, mouth-parts, except the maxillipeds, 

 enlarged (see fig. 104). Figs. 126 and 127, third and fourth swimming legs. 



Plate 51. 



Female of Artacolax ssetiger, new species. 



Fig. 128, dorsal view. Fig. 129, side view, showing fusion of third and fourth thorax 

 segments. Fig. 130, second antenna. Fig. 131, mouth-parts: la. labrum; md., 

 mandible; mx.' and mx.'\ first and second maxillae; p., paragnath. Fig. 132, 

 maxilliped. Figs. 133 to 136, first, second, third, and fourth swimming legs. 

 Fig. 137, one of the claws on the exopods of the swimming legs. 



Plate 52. 



Female of Artacolax ardeolse (KJroyer). 



Fig. 138, dorsal view. Fig. 139, side view, showing fusion of third and fourth thorax 

 segments. Fig. 140, mouth-parts (see fig. 131). Fig. 141, maxilliped. Figs. 

 142 to 145, first, second, fourth, and fifth swimming legs. Fig. 146, one of the 

 claws on the exopods of the swimming legs. 



Plate 53. 



Female of Bomolochus eminens, new species. 



Fig. 147, third swimming leg of Artacolax ardeolx. Fig. 148, dorsal view of Bomolochus 

 eminens. Fig. 149, ventral view of genital segment and abdomen. Fig. 150, 



