334 CALIFORNIA ACADEMY OF SCIENCES. 



PHACOPS. 



Phacops crlstata Hall, 1876; Illns. Dev. Foss. Crust., pi. 6, tigs. 



1-17. 

 Phacops bombifrons Hall, 1876; Illus. Dev. Foss. Crust., pi. 6, 



fis. 18-29. 



- CRISTATA Hall, 1888; Pal. New York, vol. 7, p. 14, pi. 6, figs. 1-31, 



16-29, pi. 8 a, figs. 1-4. Oriskany Sandstone, Cayuga, Ontario, 

 Upper Helderberg, Schoharie grit near Clarksville, Schoharie, N. 

 Y., etc. 



CRISTATA var. PIPA Hall, 1888; Pal. New York, vol. 7, p. 18, pi. 8 a, 



figs. 5-18. Waterville, N. Y., Le Eoy, etc., N. Y. 



Upper Helderberg. 



downinyw Murch. (See Phacops Irisulcatus Hall.) 



- HUDSONICA Hall, 1849; Pal. New York, vol. 3, p. 355, pi. 73, figs. 26- 



28. Becraft's Mt., near Hudson, N. Y. Lower Helderberg. 



? laticauda Hall, 1847; Pal. New York, vol. 1, p. 248, pi. 64, fig. 6. 



(See Dalmanites micrurus Green.) 



LOGANI Hall, 1859; Pal. New York, vol. 3, p. 353, pi. 73, figs. 15-25. 



Helderberg Mts., Becraft's Mt., Schoharie, Carlisle, Cherry Valley 

 and other places. Lower Helderberg. 



Calymene MACROPHTHALMA Green, 1832; Mon. Tril. N. A., p. 39, 

 cast 9. 



Asaphus MEGALOPHTHALMUS Troost, 1834; Mem. Geol. Soc. France, 

 vol. 3, p. 94, pi. 1, figs. 1-5. This species approaches very near 

 to Phacoiis hudsoni Hall from the Lower Helderberg. My cabinet 

 specimen from Tennessee has 5 lenses arranged into 5 vertical 

 rows in each eye. P. hudsoni has only 4 lenses in each row. 



Calymene nupera Hall, 1843; Geol. New York, 4th Geol. Dist., p. 

 262, fig. 116. 



- nupera Ernrnoiis, 1860; Manual Geol., p. 149, fig. 138 (2). 



- nupera Hall, 1876; Illus. Dev. Foss. Crust., pi. 8, fig. 26. 



- nupera Hall, 1888; Pal. New York, vol. 7, p. 27, pi. 8, fig. 27. The 



type of this species was found in a loose block of sandstone in 

 Chemuiig county. In all apparent features it agrees -with Phacops 

 rana. 



- ORESTES Bill., I860; Canadian Naturalist, vol. 5, p. 65, fig. 10. Anti- 



costi and Gaspe. Cambrian. 



- PULCHELLUS Foerste, 1887; Bull. Denisou Univ., vol. 2, p. 99, pi. 8, 



figs. 4, 20, 21. Clinton. 



- PULCHELLUS Foerste, 1889; Proc. Boston Soc. Nat. Hist., vol. 24, p. 268. 

 RANA Green. 



Somatrikelon meyalomalon McMurtrie, 1819; Sketches of Louisville 

 and the Falls of the Ohio, p. 74, 11. g. and n. sp. from the Falls of 

 the Ohio. 



Calymene bufo var. RANA Green, 1832; Monthly Am. Jour. Geol., p. 

 559. Hamilton. 



