324 CALIFORNIA ACADEMY OF SCIENCES. 



MICKODISCUS. OGYGIA. 



PUNCTATUS Whiteaves, 1878; Am. Jour. Sci., 3d series, vol. 16, p. 225. 



PUNCTATUS var. PRECURSOR Matt., 1885; Trans. Roy. Soc. Canada, 



vol. 3, p. 75, pi. 7, fig. 13. Paradoxides zone. 



- PUNCTATUS Wai., 1884; Bull. U. S. Geol. Survey, No. 10, p. 24, pi. 2, 



figs. 1, 1 a-c. 



QUADRICOSTATUS Emmons, 1855; Am. Geol., vol. 1, pt. 2, p. 116, pi. 



1, fig. 8. Augusta county, Va. Taconic. 



QUADRICOSTATUS Emmons, 1860; Manual Geol., p. 88, fig. 73. 



QUADRICOSTATUS Barr., 1861; Bull. Soc. Geol. France, 2d series, vol. 



18, p. 280, pi. 5, figs. 13 a, b. 



SPECIOSUS Ford, 1873; Am.* Jour. Sci., 3d series, vol. 6, p. 137, figs. 



2 a, b. Troy, N. Y. 



SPECIOSUS Ford, 1877; Am. Jour. Sci., 3d series, vol. 13, p. 147. 



SPECIOSUS Ford, 1879; New York Tribune Extra, Sept. 2, 1879, fig. 2. 



- SPECIOSUS Wai., 1886; Bull. U. S. Geol. Survey, No. 30, p. 154, pi. 



16, figs. 3, 3 a-c. 



SPECIOSUS Wai., 1890; 10th Eep. U. S. Geol. Survey, p. 632, pi. 81, 



figs. 5, 5 a-c. Olenellus zone. 

 NIOBE Ang., 1852; Paloeont. Scand., p. 13. 



PRODUCTA (H. & W.) Brogg.; Om alderen af Olenellus zonse i N. A., 



p. 211. Oquirrh Mts., Utah. Taconic. 



NILEUS Dalm., 1826; Palsead., p. 246 (German trans., p. 49). 



- AFFINIS Bill., 1865; Pal. Foss., vol. 1, p. 275, figs. 261 a, b. Cow 



Head and Island of Orleans. Cambrian. 



- MACROPS Bill., 1865; Pal. Foss., vol. 1, p. 273, fig. 259. Table Head, 



N. F. Cambrian. 



- SCRUTATOR Bill., 1865; Pal. Foss., vol. 1, p. 274, fig. 260. Table 



Head, Portland Creek, N. F. Cambrian. 



Nuttania Eaton, 1832 (in part); Geol. Text Book, p. 33. (See Trinucleus 

 and Homalonotus.) 



concentrica Eaton, 1832; Geol. Text Book, p. 34, pi. 1, fig. 2. 



sparsa Eaton, 1832; Geol. Text Book, p. 34. 



Odontocephalus Con., 1840; 3d Ann. Eep. Pal. Dept. New York Geol. 



Survey, p. 204. 

 Dalmanites (Odontocephalus) Hall, 1888; Pal. New York, vol. 7, p. 



xxxiii. 



Odontocephalus. (See Dalmanites (Odontocephalus) selenurus, D. (Odonto- 

 cephalus) Hfidens, D. (Odontocephalus) cegeria, and D. (Odonto- 

 cephalus) coronatus.) 

 OGYGIA Brong., 1822; Crust. Foss., p. 26. 



Asaphus BARRANDI Hall, 1851; Rep. Geol. Lake Superior Land Dist. 



(Foster & Whitney), pt. 2, p. 210, pi. 27, figs. 1 a-d; pi. 28. 



St. Mary's River, also near Plattsville, Wisconsin, cf. Ogygia 



corndensis Murch. Trenton. 



A saphus BARRANDI Hall., 1862; Geol. Wisconsin, vol. 1, p. 41, fig. 4. 



