CATALOGUE OF TRILOBITES. 323 



MICKODISCUS. 



BELLi-MARGiXATus Wal., 1890; lOtli Eep. U. S. Geol. Survey, p. 630, 



pi. SI, fig. 2, 2 a-b. Olenellns zone. 

 coNNEXrs Wal., 1887; Am. Jour. Sci., M series, vol. 34, p. 194, pi. 1, 



figs. 4, 4 b. Washington Co., N. Y. Taconic. 



coNNEXUs Wal., 1890; 10th Eep. U. S. Geol. Survey, p. G31, pi. SO, 



fig. 9, 9 a-b. Ohnelhis zone. 



DAwsoxi Hartt, 1868; Acadian Geol., p. 654, fig. 228. St. John, N. 



B. Mr. Hartt originally described this siiecies under the new 



generic name of Daivsonia, biit on Mr. E. Billings' authority the 



species was referred to Mkrodiscus in the Acadian Geol. Taconic. 



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



DAW.soxi Wal., 1884; Bull. U. S. Geol. Survey, No. 10, p. 23, pi. 2, 



figs. 3, 3 a. 



iiAWSoxi Matt., 1855; Trans. Key. Soc. Canada, vol. 3, p. 75, pi. 7, 



figs. 11 a-c. 



HELENA Wal., 1889; Proc. Nat. Mus., vol. 12, p. 41. 



■ HELENA Wal., 1890; 10th Eep. U. S. Geol. Survey, p. 632, pi. 81, figs. 



1, la. Olenellns zone. 

 Agnostus lobatcs Hall, 1847; Pal. New York, vol. 1, p. 258, pi. 67, 



figs. 5 a-f. One mile east of Troy, N. Y'. Taconic. 



Agnostus lobatus Eogers, 1858; Geol. Survey Pennsylvania, vol. 2, 



p. 820, tig. 614 (1-4). 



LOBATUS Ford, 1873; Am. Jour. Sci., 3d series, vol. 6, p. 135 (foot- 



note). 



LOBATUS Wal., 1886; Bull. U. S. Geol. Survey, No. 30, p. )56, pi. 16, 



figs. 1, 1 a, b. Troy, N. Y. 



LOBATUS S. & F., 1888; Bull. Mus. Comp. Zool. Harvard Coll., vol. 



16, p. 36, pi. 2, fig. 13. 



LOBATUS Wal., 1890; 10th Eep. U. S. Geol. Survey, p. 632, pi. 81, figs. 



4 a-b. 

 MEEKi Ford, 1876; Am. Jour. Sci., 3d series, vol. 11, p. 371. Troy, 



N. Y. Taconic. 

 MEEKI Wal., 1886; Bull. U. S. Geol. Survey, No. 30, p. 155, pi. 16, 



fig. 4. 



.MEEKI Wal., 1890; 10th Eep. U. S. Geol. Survey, p. 632, pi. 81, fig. 



3. Olenellns zone. 



i'ARKERi Wal., 1886; Bull. U. S. Geol. Survey, No. 30, p. 157, pi. 16, 



figs. 2, 2 a. Township of Georgia, Vt. Taconic. 



PARKERi Wal., 1890; 10th Eep. U. S. Geol. Survey, p. 632, pi. 80, figs. 



7, 7 a. Olenelius zone. 



I'ULCHELLUS (Hartt MS.) Wal., 1884; Bull. U. S. Geol. Survey, No. 10, 



p. 24. Eatcliflf's Millstream, N. B.; Manuel's Brook, near Con- 

 ception Bay, N. F. Taconic. 



I'UXCTATUS Salt., 1864; Quart. Jour. Geol. Soc. Loudon, vol. 20, p. 



237, pi. 13, fig. 11. St. John, N. B. 



