1913] The Ottawa Naturalist. 103 



both shields being smooth. Type, Agnostus! nobilis, Ford. 

 Lower Cambrian. Eastern North America. 



Bibliography. 



The writer will be very gjad to receive additions and 

 corrections to this bibliography. 



Genus Eodiscus. 



E. belli-marginatus (Shaler and Foerste), Bull. Mus. Comp. 

 Zool.,1888, 16, p. 35, pi. 2, fig. 9. Walcott, 10th Ann. Rept. 

 U. S. G. S., 1891, p._ 630, pi. 81, figs. 2, 2a, b. Grabau, Occ. 

 Papers Bos. Soc. Nat. Hist., 1900, 4, p. 670. 



E. belli-marginatus Mut. insularis Matthew, Trans. Roy. 

 Soc. Can., 1899, se\ 2, vol. 5, sect. 4, p. 75, pi. 3, figs. 6a, b 



E. comleyensis (Cobbold). ' Quart. Jour. Geol. Soc, 1910. 

 66, p. 21, pi. 3, figs. 1-4. 



E. connexus (Walcott). Am. Jour. Sci., 1887, 34, ser. 3, 

 p. 194, pi. 1, figs. 4, 4b; 10th Ann. Rept. U. S. G. S., 1891, p. 631, 

 pi. 80, figs. 9, 9a, b. Matthew, Am. Geol. 1891, p. 287., 



E. eucentrus (Linnarsson). Sveriges Geologiska Undersok- 

 ning, 1883, ser. C, No. 54, p. 30, pi. 4, figs. 19, 20. (Referred by 

 Lake to E. punctatus, and by Groenwald to a variety of E. 

 scanius). 



E. helena (Walcott). Proc. U. S. Nat. Mus., 1889, 12, p. 41; 

 10th Ann. Rept. U. S. G. S., 1891, p. 632, pi. 81, figs. 1, la- 

 Cobbold, Quart. Jour. Geol. Soc. London, 1910, 66, p. 23, pi. 3, 

 figs. 14-16. E. cf. helena. Burr. Am. Geol., 1900, 25, p. 47- 

 Grabau, Occ. Papers Bos. Soc. Nat. Hist., 1900, 4, p. 671, pi. 33, 

 fig. 3. 



E. meeki (Ford). Am. Jour. Sci., 1876, 11, ser. 3, p. 371. 

 Walcott, Bull. 30, U. S. G. S., 1886, p. 155, pi. 16, fig. 4; 10th 

 Ann. Rept. U. S. G. S., 1891, p. 632, pi. 81, fig. 3. 



E. praecursor (Matthew). Trans. N. Y. Acad. Sci., 1896, 



15, p. 239, pi. 17, fig. 7. Non text fig. 



E. pulchellus (Walcott). Bull 10, U. S. G. S., 1884, p. 24, 

 pi. 2, figs. 1, la-c. Matthew, Trans. N. Y. Acad. Sci., 1896, 15, 

 p. 242, pi. 17, figs. 8a-f. 



E. punctatus (Salter). Quart. Jour. Geol. Soc. London, 

 1864, 20, p. 237, pi. 13, fig. 11 Matthew, Trans. N. Y. Acad. 

 Sci., 1896, 15, p. 244. Lake, Brit. Camb. Tril., 1907, p. 36, pi. 3, 

 figs. 11-17. Cobbold, Quart. Jour. Geol. Soc. London, 1913, 

 69, p. 37. 



E. punctatus, non Salter. Whiteaves, Am. Jour. Sci., 1878, 



16, ser. 3, p. 225. Walcott, Bull. 10, U. S. G. S., 1884, p. 24, 

 pi. 2, figs. 1, la-c Foerste, Bull. Den. Univ., 1888, 3, p. 117, 

 pi. 13, fig. 5. E. pulchellus. 



