PACKARD.] PHYLLOPODS OF NORTH AMERICA. 307 



two-thirds as broad as long, with the umbones or beak rather x)rominent, 

 oblique, situated on the anterior fourth of the shell, which is fuller, more 

 globose than in the foregoing species ; dorsal edge straight behind the 

 beak, and a little beyond the posterior third of the entire shell rather 

 suddenly sloping down, though the end is full and rounded. Shell 

 (Fig. 10, in text) narrower than usual in the transverse diameter; about 

 sixteen to twenty lines of growth, with fine sette along the lines; un- 

 usually fine microscopic punctures between the lines, too numerous to be 

 counted with a triplet. Under a higher ]30wer the dark spots in the soft 

 tissue of the shell are seen to be either separate (Plate XXIV, fig. 3) or 

 confluent (Plate XXIV, fig. 6), forming parallel markings, which disap- 

 pear before reaching the line above. (The series of oval clear spaces 

 in the drawing are the attachment of the setse, which are long and 

 slender, see Plate XXIV, fig. 3.) In Baird's fig. ia and 6b of E. dunkeri 

 the punctures are separate, and probably there is a variation in this 

 respect. Male shell narrower, and with rather more prominent beaks 

 than in that of the female. Head, with the rostrum, long and pointed; 

 first antennae rather thick, and moderately long; second antennae with 

 rather short joints, 17 in the upper and 16 in the lower flagellum; the 

 upper sides of all the joints with 4-5 slender setae; legs of the female, 

 with the gill, rather long and large, the lower division of the flabeliuin 

 quite broad; the upper or oviger (Plate XXIV, fig. 9) quite long and slen- 

 der, but shorter than in _EJ. comjyleximanus. First and second pair of legs 

 of the male with rather slender hands, and both divisions of the flabel- 

 lum are rather short and broad; the claw (sixth endite) is shorter than 

 in E. compleximanus, as is the thumb, or fourth endite; the fifth endite 

 is much as in E. compleximanus. The telson is shorter and higher than 

 in E. compleximanus^ with about twenty pairs of unequal spinules, the 

 first, third, sixth, ninth, twelfth, fifteenth, seventeenth, and nineteentli 

 much larger than in the others, while in E. compleximanus they are of 

 uniform size; each spine is minutely spinulated; the terminal superior 

 spine one-half as large as the inferior, but finely spinulated; the cau- 

 dal appendages with fijie, hair-like setae on the upper edge. 



The males have stouter spines on the telson than in the other sex. 

 Length of shell, 10-12"^'^ ; height, 7"^"^ ; transverse diameter, 4™™. This 

 species differs from E. compleximanus in the more globose shell, the 

 much shorter dorsal edge, which suddenly bends down, the fuller ends, 

 the shorter hands of the male, and the unequal spines on the telson. 

 From E. morsei it differs in the flatter, more oblong shell, and in the 

 beak being much smaller, more oblique, and much nearer the anterior 

 end of the dorsal edge, while the hands of the males are much slenderer 

 than in E. morsei. 



This is apparently the most abundant and widely diffused species on 

 the continent, as will be seen by the following notes : 



Lake Winnepeg, Xorth America (W. Caldwell, esq.); (Mus. Brit.) 

 (Baird.) 



Several hundred young (figures on Plate XXVIII, figs. 1-6) about one- 

 half full size, collected by the laie Prof. H. James Clark from a puddle 

 in Lexington, Ky., May 21. 



Cincinnati (Mus. Cliicago Academy Science), Hamilton County, 

 Ohio, in a cart rut, " so numerous that a dip of the hand would take 

 up a dozen " (V. T. Chambers). 



Ellis, Kans., "in an upland pool supplied by a spring" (Dr. L. Wat- 

 son), Fort Wallace, Kansas, in company with Estheria compleximanus and 

 Streptocephn.lus texanus. (Prof. J. Lindahl.) 



Common at the pueblo of Santa Ilsafonso, Xew Mexico, August; 



