North American Palaeozoic Crustacea. 



35 



excelsior, Hall, MSS. 



excelsior, Martin, 1882 ; Trans. New York Acad. Sci., vol. 2, p. 8. 



Catskill. 

 excelsior. Hall, 1884 ; 36th Rept. New York State Mus., p. 77, pi. 5, fig. 1. 

 excelsior, Hall, 1885 ; Proc. Am. Assoc. Adv. Sci., 33d meeting, p. 421. 

 excelsior, Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 158, pi. 26 ; 

 also p. 221, pis. 26, and 26 a. 

 Compare Dolichocephala Lacoana, Claypole, 1883. 

 Stylonurus Wrightianns, Dawson. 



Equisetides Wrightianns, Dawson, 1881 ; Quart. Jour. Geo!. Soc. London, 



vol. 37, p. 301, pi. 12, fig. 10 ; pi. 13, fig. 20. Portage. 



Equisetides Wrightianns (Dawson), Wright ; 35th Rept. New York State Mus. 



Nat. Hist., Expl. pi. 15, note, figs. 1, 2, 3. 

 Echinocaris Wrightiana, Jones & Woodward, 1884; Geol. Mag., Dec. 3, vol. 1, 



p. 3, pi. 13, figs, la, b. 

 Echinocaris Wrightiana, Etheridge, Woodward & Jones, 1885 ; 3d Rept. 

 Comm. Fossil Phyllopoda Pal. Rocks, p. 35 ; also 6th Rept. 1888, p. 8. 

 ? (Echinocaris?) Wrightianns, Hall & Clarke, 1888 ; Pal. New York, vol. 7, 

 p. 160, pi. 27, figs. 7-9. 

 Tropidocaris, Beecher, 1884; 2d Geol. Survey Pennsylvania, vol. PPP, p. 15. 

 Diagnosis. — " Carapace hivalvular, sub-quad- 

 rate or sub-ovate in outline, posterior margin 

 transverse or incurved. Hinge-line straight, 

 nearly equaling the length of the valves. 

 Valves slightly gaping at the anterior ex- 

 tremity. Rostrum narrow and elongate, or- 

 namented with longitudinal ridges. Cephalic 

 region characterized by low, rounded, indis- 

 tinct elevations. Optic node well defined. 

 Surface with one or more strong longitudinal 

 carinje. Abdomen as far as known, composed 

 of two segments, which are subcylindrical 

 and without nodes or spines." (Hall & 

 Clarke, Pal. New York, vol. 7, p. Ivi.) 

 alternata, Beecher, 1884; 2d Geol. Survey 

 Pennsylvania, vol. PPP, p. 19, pi. 2, figs. 

 7, 8. Chemung, 



alternata, Etheridge, Woodward & Jones, 1885 



Phyllopoda Pal. Rocks, p. 35. 

 alternata. Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 186, pi. 31, 



figs. 14, 15. 

 bicarinata, Beecher, 1884 ; 2d Geol. Survey Pennsylvania, vol. PPP, 

 p. 16, pi. 2, figs. 3-5. Chemung, 



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



Phyllopoda Pal. Rocks, p. 35. 

 bicarinata. Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 184, pi. 31, 

 figs. 7-12. 



3d Rept. Comm. Fossil 



