306 GEOLOGICAL SURVEY OF THE TERRITORIES. 
distinct and acute. 2d antenne moderately slender, the scape not so 
thick asin H. californica; the upper flagellum 15-, the lower 14-jointed ; 
the joints longer and slenderer than in EH. mexicana. The legs of the fe- 
male, especially one of the anterior pairs, have larger gills than in ZH. 
Mexicana. (Compare Plate XXIV, figs. 9and 10.) The adjacent upper 
flabellum is moderately long, filamental in the upper half, but not rae 
ing to the back of the animal; the lower division of the flabellum (fig. 7 
br’’) forms a long lobe scalloped on the upper edge, and closely resem- 
bling in form and size the 6th endite. The 5th endite is long, finger 
shaped, and reaches beyond the 6th. In the male the first pair of feet 
have short, broad hands, with a broad 4th endite, but the finger-like 5th 
endite is slenderer than that of the second pair, in which the hand is 
much longer and slenderer. Both pair of hands, particularly the first, 
are much stouter than those of HY. mexicana. The telson is armed along 
the upper edge with very numerous even teeth, no larger ones being in- 
terpolated among smaller ones, and the caudal appendages are finely 
serrated from base to tip. 
Length of shell, 11™; oneielin, 6™™; diameter or thickness, 2.5™™. 
Ellis, Kansas, in pools, June 24-29, 1874 (Dr. L. Watson). 
Fort Wallace, Kansas, abundant, associated with E. mexicana, Strep- 
tocephalus texanus, &e. (Prof. J oshua Lindabl. ) 
This species may be readily recognized by the long, narrow shell, and 
Fic. 8.—a. Hand 
of male Estheria 
compleximanus, Fic. 9. Estheria complexinfffmus Pack, magnified. Lindahl del. 
much enlarged; b, 
telson. Emerton 
del. 
the small beaks situated very near the anterior end of the dorsal edge; 
by the finely serrated edge of the telson and caudal appendages, the 
large gills, the short, thick hands of the male, and by the sculpturing 
of the shell. 
By an unfortunate mistake it was referred to the genus Eulimnadia, 
for which it was hastily mistaken on account of its oblong-oval smooth 
shell. 
ESTHERIA MEXICANA Claus. 
Plates XXIV, figs. 3, 6,9; XXV, figs. 1-5; XXVIII, figs. 1-5. 
Estheria mexicana Claus, Beitriige, zur Kennt. d Entomostraken, Marburg, Taf. III, IV, 
figs. 33-54, 1860. 
Estheria dunkeri Baird, Proc. Zool. Soc., London. 147. Pl. XV, figs. 6, 6a, 6b, 1862. 
Annals Mag. Nat. Hist., 3d ser., 391, 1862. 
Estheria caldwelli Baird, Proc. Zool. Soc., London, 143. Pl. XV., figs. 4, 4a, 4b, 1862. 
Ann. Mag. Nat. Hist., 3d ser., x, 393, 1862. — 
Estheria clarkit Packard, Sixth Report Peabody Acad. Science, Salem, 55, June, 1874. 
Hayden’s U. 8. Geol. Sury. Terr., 1873, 619, Pl. II, fig. 7, 1874. 
Shell or carapace valves thin, amber-colored, oblong oval, thin, about 
