34 



North American Palaeozoic Crustacea. 



Emersoni, Clarke, 1882; Am, Jour. Sci., 3d series, vol. 23, p. 478, plate 



(4), figs. 1-3. Hamilton. 



Emersoni, Packard, 1883 ; 12tli Kept. U. S. Geol. Survey Territories, p. 451. 



Emersoni, Woodward & Jones, 1884 ; 2d Rept. Comm. Fossil Pliyllopoda 



Pal. Rocks, p. 7. 

 Emersoni, Clarke, 1885 ; Bull. U. S. Geol. Survey, No. 16, p. 46. 

 Emersoni, Etheridge, Woodward & Jones, 1885 ; 3d Rept. Comm. Fossil 



Phyllopoda Pal. Rocks, p. 3. 

 Emersoni, Clarke, 1886 ; Neues Jahrbuch fiir Min., p. 180. 

 Emersoni, Hall & Clarke, 1888; Pal. New York, vol. 7, p. 199, pi. 35, 



figs. 12-18. 

 Emersoni, Etheridge, Woodward &, Jones ; 6th Rept. Comm. Fossil Phyll- 

 opoda Pal. Rocks, pp. 3 and 8. 

 SolenocariB, Meek, 1871 ; Proc. Acad. Nat. Sci. Phila., vol. 23, p. 335. (Not 

 Solenocaris, Young, 1868.) 

 The term Solenocaris was used by Mr. J. Young for a fossil genus of Crus- 

 tacea in 1868 ; see Strigocaris. 

 St. Ludovici, Worthen, 1884 ; Bull. Illinois State Cab. Nat. Hist., No. 2, 

 p. 3. St. Louis. 



Ceratiocaris {Solenocaris) strigata, Meek, 1871 ; Proc. Acad. Nat. Sci. Phila., 

 3d series, p. 335. Waverly. 



Ceratiocaris (^Solenocaris) strigata, Meek, 1875 ; Pal. Ohio, vol. 2, p. 321, pi. 18, 



figs. 4 a, b. c. 

 Strigocaris, name suggested to replace pre-occupied name Solenocaris. 

 Strobilepsis, Clarke, 1888; Pal. New York, vol. 7, p. 212. 



spinigera, Clarke, 1888 ; Pal. New York, vol. 7, p. 212, pi. 36, figs. 20-22. 



Hamilton. 

 Stylonurus, Page, 1856 ; Advanced Text- 

 Book Geology. 

 Diagnosis. — Body in general propor- 

 tions similar to Eiirypterits. Ceplia- 

 lon subquadrate or sub-pentagonal 

 in outline. Eyes large, circular, and 

 approximate ; sometimes surrounded 

 by conspicuous orbital ridges. Ocelli 

 situated at the posterior extremity 

 of a median ridge, passing between 

 the eyes. Surface coarsely sqtiamose. 

 Cephalic appendages in 5 pairs, tlie 

 last of which are produced nearly 

 to the extremity of the telson. Seg- 

 ments of the abdomen similar to 

 those of Eurypterus. Those of the 

 post-abdomen each bear a pair of 

 lateral, detachable processes or epi- 

 mern. Caudal spine long and slender 

 or subclavate. 



