154 RATPIBUN 



to a distance equaling one-third the length of the telson ; the outer 

 lamina is longer and broader than the inner, its distance behind the 

 telson equaling fully one-half the length of the telson. 



Dijnejisions. — Female : Length from tip of rostrum to tip of telson 

 37 mm. ; length of carapace and rostrum 9 ; length of rostrum 2.5 mm. 



Type locality. — Rio Parahyba do Norte, on mangroves ; one ovi- 

 gerous female. Cat. No. 23757. 



Family PAL^MONID^E. 

 PAL^MON BRACHYLABIS sp. nov. 

 PI. VIII, fig. 10. 



Female. Dorsal crest arising a little in front of the middle of the 

 carapace, or about two-fifths the distance behind the orbits. Crest 

 slightly ascending for its proximal half, strongly ascending for its 

 distal half. Rostrum overreaching the antennal scale for its distal 

 fourth. Upper margin of crest armed with 9 or 10 teeth ; the proxi- 

 mal 7 or 8 are near together and equidistant ; the next one is about 

 twice the distance from the others ; the last one is near the tip of the 

 rostrum ; 2 or 3 of them are posterior to the orbit. The inferior 

 margin is armed with 3 or 4 teeth, the distal one at some distance 

 from the extremity. Terminal third of rostrum very slender. Upper 

 flagellum of inner antennae with 10 segments united, 14 free. 



Carpus of second pair of feet reaching a little beyond the rostrum. 

 Carpus as long as the palm and half the fingers. Palm two and a 

 half times as long as the fingers, not swollen. Fingers not gaping. 



Di?nensio7is. — Female: Length of body 37.2 mm. ; length of cara- 

 pace and rostrum 16.4; length of rostrum 9.4 mm. 



Type locality. — Mamanguape stone reef ; five specimens. 



Additio7ial locality. — Rio Parahyba do Noi'te, on mangroves; tsvo 

 specimens. Cat. No. 2375S. 



The long upturned rostrum with ^ teeth, and the very short 

 fingers of the second pair of feet readily distinguish this species. 



BITHYNIS ACANTHURUS (Wiegmann). 



Palamon acant/iurus Wirgmann, Arch. f. Natur., 11, part i, 150, 1836. 

 PalcEvion forceps Milne Edwards, Hist. Nat. Crust., ir, 397, 1837. 

 Palmnon forceps VQ-ayiAKTRiis, Arch, f. Natur., xxxv, part i, 28, pi. 11, fig. 

 4, 1869. 



Pernambuco, on mangroves; two specimens. 



Market at Maceio, Alagoas; said to have come from Lagoa do 

 Norte, a large lake near Maceio. 



