47 



compressed with the angles rounded; beyond this thicker proximal portion the flagellum contains 

 6 slender joints; the third joint of the shaft is a little produced below, and this protuberance 

 has a very long, strong-, a little curved spine directed forwards and reaching a little beyond 

 the protuberance on the main "branch". Antennal squama reaches distinctly beyond the middle 

 of third joint of the antennular peduncle. Coxse of third pair of Iegs with most of the inner 

 margin convex and no tooth at its distal end, but on the lower side of each coxa near the 

 inner margin protrudes (as in the female, fig. 14) a large, oblong, acute process directed down- 

 wards, much forwards and a little or somewhat outwards; trochanter without any tooth at the 

 distal inner end. Genital coxse obliquely triangular, broader than long, with the front end sub- 



4t.(,H) 



nW 



t^) 



«e-») 



Figs. S — 14. Acetes paraguayertsis n. sp. 



Fig. 8. Front part of carapace with left eye, antennula and antenna 



of a male. 

 F'S' 9- Upper front part of carapace of the same male. 

 Fig. 10. Lower male flagellum, from the outer side. 

 Fig. II. Proximal part beyond the shaft of the same flagellurii, from 



the inner side. 



Fig. 12. Exopod of left uropod of a male. 



Fig. 13. Left petasma, from behind ; a. pars astringens, e. pars 



externa, m. pars media. 

 Fig. 14. Proximal parts of third legs and the genital area of a 



female. 



acute, and an impression on the inner side. Exopod of uropods (fig. 12) unusually broad, about 

 three and a half times as long as broad; the ciliated part occupies scarcely two-fifths of the 

 outer margin, and the glabrous part terminates in a minute tooth. 



The petasma (fig. 13) is most peculiar. Pars astringens («.) is very broad, and its inner 

 margin with numerous coupling hooks. Pars externa (e.) is an oblong plate not quite three 

 times as long as broad, with the distal part broad and obliquely rounded. Pars media (m.) has 

 'its free proximal portion short with the basal margin oblique and somewhat concave; the distal 

 half is a free plate with the lateral margins subparallel, the terminal margin somewhat oblique, 

 a little concave at the middle, and the lateral corners are broadly rounded; this portion has 

 no vestige of any hooks or processes, and therefore I am not quite sure that the males are 

 really adult. 



Length 19 mm. 



Female. — Rostrum with crest and the eyes about as in the male. Antennulae with 

 second and third joints of the peduncle a little shorter but scarcely more slender than in the 

 male; thickened part of upper flagellum as long as third joint of the peduncle; lower flagellum 

 is somewhat longer than third peduncular joint, with about 14 joints. Antennal squama reaches 

 the end of the antennular peduncle. Coxa; of third pair of legs nearly as in the male (fig. 14). 



