306 



GEOLOGICAL SUEVEY OF THE TEEEITORIES. 



diwstinct and acute. 2d antermpe moderately slender, tlie scape not so 

 thick as in U. calif ornica-, the upper flagellum 15-, the lower 14-jointed; 

 the joints longer and slenderer than in JE. mexicana. The legs of the fe- 

 male, especially one of the anterior pairs, have larger gills than in E. 

 Mexicana. (Compare Plate XXIY, figs. 9 and 10.) The adjacent upper 

 flabellum is moderately long, filamental in the upper half, but not reach- 

 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 0th. 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 E. mexicana. The telson is armed along 

 the nipper 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, ir^'"; breadth, 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, &c. (Prof. Joshua Liudahl.) 



This species may be readily recognized by the long, narrow shell, and 



Fig. 8.— a. Hand 

 of male Esthcria 



compleximanus, j-m. 9. Estheria complesimanus Pack, magnifled. Lindalil del. 



much enlarged ; &, 

 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. 



ESTHEKIA MEXICANA ClaUS. 

 Plates XXIV, figs. 3, 6, 9; XXV, figs. 1-5; XXVIII, figs. 1-5. 



Estheria mexicana Claus, Beitrage, ziir Kennt. d Entomostraken, Marburg, Taf. Ill, IV, 



figs. 33-54, 1860. 

 Esihma clunlccri Baird, Proc. Zool. Soc, London. 147. PI. XV, figs. 6, 6a, 6&, 1862. 



Annals Mag. Nat. Hist., 3d ser., 391, 1862. 

 Estheria caUivelli Baird, Proc. Zool. Soc, London, 148. PI. XV., figs. 4, 4a, 46, 1862. 



Ann. Mag. Nat. Hist., 3d ser., x, 393, 1862. 

 Esthcria clarkii Packard, Sixtli Eeport Peabody Acad. Science, Salem, 55, June, 1874. 

 Hay don's U. S. Geol. Surv. Terr., 1873, 619, PL III, fig. 7, 1874. 



Shell or carapace valves thin, amber- colored, oblong oval, thin, about 



