North American Palaeozoic Crustacea. 33 



Plumulites, Barrande, 1872; Syst. Sil. Boheme, Suppl., vol. 1, p. 5(55. 



Devonicus. Clarke, 1882 ; Am. Journ. Sci., 3d series, vol. 24, p. 55, 



figs. 1, 2. Hamilton. 



Jamesi, Hall & Whitfield, 1875 ; Pal. Ohio, vol. 2, p. 106, pi. 4, figs. 1-3. 



Hudson River. 



? Jamesi, Miller, 1875 ; Cincinnati Quart. .Jour. Sei., vol. 2, p. 275, fig. 19. 



Referred by Faber, Jour. Cincinnati Soc. Nat. Hist., vol. 9, 1886, p. 15, 



to a new genus under the name of Lepidoroleus. 



Newberryi, Whitfield, 1881 ; Annals New York Acad. Sci., vol. 2, p. 217. 



Huron Shales. 



Rhachura, Scudder, 1878 ; Proc. Boston Soc. Nat. Hist., vol. 19, p. 296. 



Probably the same as the genus Dithyrocaris, Scouler, 1843. 



venosa, Scudder, 1878; Proc. Boston Soc. Nat. Hist., vol. 19, p. 296, pi. 9, 



figs. 3, 3 a. Coal Measures. 



Dithyrocaris? venosa, Etheridge, Woodward & Jones, 1889 ; 6th Rept. Comm. 



Fossil Phyllopoda, p. 4. 57th Rept. Brit. Assoc. Adv. Sci., p. 60. 

 Rhinocaris, Clarke, 1888 ; Pal. New York, vol. 7, p. Iviii. 

 Diagnosis. — " Cephalo-thorax uni valvular, laterally 

 appressed ; outline as in Ceratiocaris. Anterior ex- 

 tremity produced into a narrow, vertically flattened 

 prora continuous witli substance of the carapace. 

 The axial line of the carapace bears a low ridge 

 along which it shows no inclination to separate 

 when laterally compressed. Surface smooth or 

 with one or more lateral carinje, and ornamented 

 by finely elevated lines, granules, or tubercles. 

 Abdomen composed of not less than 4 smooth sub- 

 cylindrical somites. Post- abdomen bearing three 

 spines, of which the telson is elongated and conical 

 and the cercopods flattened." (Pal. New York, 

 vol. 7, p. Iviii.) 

 Columbina, Clarke, 1888 ; Pal. New York, vol. 7, 

 p. 195, pi. 31, figs. 16-21. Hamilton. 



Columbina, Etheridge, Woodward & Jones, 1888; 6th 



Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 8. 

 scaphoptera, Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 197, pi. 31, 

 figs. 22, 23. Hamilton, 



scaphoptera, Etheridge, Woodward & Jones, 1888 ; 6th Rept. Comm. 

 Fossil Phyllopoda Pal. Rocks, p. 8. 

 Schizodiscus, Clarke, 1888 : Pal. New York, vol. 7, p. 207. 



capra, Clarke, 1888 ; Pal. New York, vol. 7, p. 207, pi. 35, figs. 1-9. 



Hamilton. 

 Spathiocaris, Clarke, 1882; Am. Jour. Sci., 3d series, vol. 23, p. 477. 



Diagnosis. — "Carapace in one piece, elliptical, subconical and patelloid 

 apex situated at or near one focus of the ellipse. The cephalic cleft 

 begins just in front of the apex and slowly widens to the anterior 

 extremity. Surface ornamented with closely set concentric lines, and 

 usually with fine radii on the anterior and posterior portions." (Pal. 

 New York, vol. 7, p. Iviii.) 



Annals N. Y. Acad. Sci., Nov. 1889.— 3 



