568 BULLETIN 159, UNITED STATES NATIONAL MUSEUM 



61. Basal segment of first antenna nearly as long as remaining 



segments combined, a stout spine at its outer corner; endopod 

 of second antenna 3-segmented; muddy bottom, shallow. 



cT 9 Tetragoniceps Brady, 1880 

 Basal segment of first antenna short and without a spine 62 



62. Terminal segment of fifth leg two to four times as long as wide 63 



Terminal segment of fifth leg nearly as wide as long, or wider 64 



63. Caudal rami lamellar, twice the length of the anal segment, 



three times as long as wide, closely juxtaposed; apical setae 

 short and rudimentary; muddy bottom, shallow. 



? Laophontopsis G. O. Sars, 1908 

 Caudal rami cylindrical, no longer than anal segment, twice as 

 long as wide, widely separated; apical setae long, stout, and 

 well developed; moderate depths, among algae. 



9 Normanella Brady, 1880 



64. Proximal segment of second antenna distinctly divided, the 



exopod attached to the end of the basal portion; fifth legs 



small, wider than long; Httoral 9 Leptocaris T. Scott, 1899 



Proximal segment of second antenna divided, exopod attached 

 to end of distal portion; fifth legs as long as wide; oyster 

 washings 9 Ceyloniella Thompson and Scott, 1903 



Proximal segment of second antenna not divided, the exopod 



attached to its outer margin 65 



65. Endopod of first legs longer than exopod; caudal rami as wide as 



long and widely separated; segments of fifth leg separated in 



male; brackish pools, ditches cf 9 Mesochra Boeck, 1865 (p. 237) 



Exopod of first legs longer than endopod; caudal rami longer 

 than wide and close together; segments of fifth leg fused in 

 the male; littoral, surface tow cf 9 Lourinia Wilson, 1924 



66. Terminal segment of fifth legs two to eight time as long as wide 67 



Terminal segment of fifth legs as wide as long or wider 70 



67. Exopods of first legs longer than endopods; distal endopod seg- 



ment longer than proximal; caudal rami five times as long 



as wide, with 6 setae; muddy bottom 9 Mesocletodes G. O. Sars, 1909 



Exopods of first legs longer than endopods; distal endopod seg- 

 ment longer than proximal; caudal rami as wide as long, 

 each with 2 setae; marine, Banyuls 9 Nannopodella Monard, 1928 



Rami of first legs subequal; endopod segments in first 3 pairs of 

 legs also about equal; caudal rami as wide as long, with 1 

 spine and4 setae; beach sands 9 Paraleptastacus, new genus (p. 248) 



Rami of first legs subequal; distal endopod segments in first 3 



pairs of legs twice as long as proximal 68 



68. Rami of second and third legs subequal; first antennae 5-seg- 



mented in female, 7-segmented in male: exopod of second 

 antenna with 1 apical and 1 lateral seta; muddy bottom, 



shallow c? 9 Enhydrosoma Boeck, 1872 



Exopod of second and third legs much longer than endopod 69 



