THE FAIRY SHRIMPS (PHYLLOPODA) 675 



77 (76) Shell globose with 13 lines of growth; umbones prominent, one- 

 third length of shell from anterior end. 



Estheria setosa Pearse 1913. 



This species resembles Estheria belfragei in many respects but is easily 

 distinguished by the smaller number of lines of growth and the length of 

 the dorsal setae at the anterior edge of the telson. Collected in eastern 

 Nebraska from small pools. 



FIG. 1048. Estheria setosa. Shell, side view. X 3. 



78(75) Flagellaof second antenna 17- and i6-segmented 79 



79 (80) Shell swollen; umbones rather prominent, one-fourth length of shell 



from anterior end; dorsal margin short, suddenly sloping at 

 posterior end; telson with larger teeth interpolated between 

 the smaller ones Estheria mexicana Claus 1 860. 



A species of very wide range extending from Lake Winnipeg 

 through Kansas, Nebraska, Kentucky, Ohio, and New Mexico 

 into Mexico. It is rather variable in its structure. 



FIG. 1049. Estheria mexicana. Shell, side view. X4. (After Packard.) 



80 (79) Shell somewhat globose; umbones more prominent than in Estheria 



mexicana, slightly nearer the anterior end than in Estheria 



belfragei Estheria morsei Packard 1871. 



South Dakota, Nebraska. Fig. 1049 shows the general structure of this species. 



IMPORTANT PAPERS ON FRESH-WATER PHYLLOPODA 



CALMAN, W. T. 1909. Crustacea. Lankester's Treatise on Zoology, Pt. 



VII, Fasc. 3: 29-55. London and New York. 

 DAD AY, E. 1910. Monographic systematique des Phyllopodes Anostraces. 



Ann. Sci. Natur., (9) n: 91-492, 84 figs. 

 HAY, 0. P., and W. P. 1889. A contribution to the knowledge of the Genus 



Branchipus. Amer. Natur., 23: 91-95. 

 PACKARD, A. S. 1883. A Monograph of the Phyllopod Crustacea of North 



America, with Remarks on the Order Phyllocarida. 12 Ann. Rept. U. S. 



Geol. Surv.: 295-590, 39 pis., i Map. 

 PEARSE, A. S. 1913. Notes on Phyllopod Crustacea. 14 Rept. Michigan 



Acad. Sci.: 191-197, 3 pis. 

 SHANTZ, H. L. 1905. Notes on North American Species of Branchinecta and 



their Habits. Biol. Bull., 9: 249-264; pis. 10-12. 



