WRITINGS OF C. D. WALCOTT. 187 



Page. 



Qraptolithus, Linnsns, 1736 20 



O. annectans, n. a., 'Walcott, 1879 20 



Dendrograptus, Hall, 1865 20 



J>. simplex, n. s., "Walcott, 1879, pl.i, flg8.5, 5 a, 6, and 6 20 



B. tenuiramosus, n. s., "Walcott, 1879, pl.i, fig. 4 21 



D. compactus, n. s., Walcott, 1879, pi. i, fig. 1 21 



Sagenella, Hall, 1852 22 



8. ambigua, n. s., "Walcott, 1879, pi. i, figs. 3, 3 a 22 



Modiolopsis, HaU, 1847 22 



M. cancellata, n. s., "Walcott, 187^'pl.i, figs. 8,8 a 22 



Orthoceras, Breynius, 1732 22 



O. oneidaense, n. s. , "Walcott, 1879, pL i, figs. 7, 7 a 22-23 



Beyrichia cincinnatiensis, Miller 23 



Triarthrus becki, Green, 1832 23-24 



Metamorphoses of Triarthrus becki 24-26 



Degree of development 26-29 



Periods of development 29-30 



Comparison of parts during development 30-31 



Table of development 31-32 



Ornamentation 32-33 



Catalogue of fossils occurring in the TJtica slattf 34-38 



11. 



Walcott, C. D. The Permian and other Paleozoic Groups of the Kanab Valley, 

 Arizona. <^ Amer. Jour. Sci., 3d ser., vol. xx, pp. 221-225. September. New 

 Haven, 1880. 



12. 



Walcott, C. D. The Trilobite: New and Old Evidence Eelating to its Organization, 

 <^Biill. Mus. Comp. Zool., at Harvard College, vol. viii, No. 10, pp. 191-224, pis. 

 i-vi. March. Cambridge, 1881. 



13. 



Walcott, C. D. On the nature of Cyathophycus. <^ Amer. Jour. Sci., 3d ser., vol. 

 xxii, pp. 394-395. November. New Haven, 1881. 



14. 



Walcott, C. D. Description of a New Genus of the The Order Euripterida from the 



Utica slate. <|Amer. Jour. Sci., 3d ser., vol. xxiii, pp. 213-216. March. New 



Haven, 1882. 



Page. 

 Hchinognathus, n. g., "Walcott, 1882. 



E. elevelandi,ii. s,, "Walcott, fig. 1, p. 213; fig. 2, p. 214 213-216 



15. 



Walcott, C. D. Injury sustained by the Eye of a Trilobite at the time of Moulting 



of the shell. <Amer. Jour. Sci., 3d ser., vol. xxvi, p. 302. October. New 



Haven, 1883. 



16. 



Walcott, C. D. Descriptions of new species of Fossils from the Trenton group of 



New York. <35th Regents Rep., N. Y. State Mus. Nat. Hist., pp. 207-214, pi. 



xvii. Albany, 1884. 



Published in advance. October 15, 1883, pp. 1-8, pL xviL 



Page. 



Qlyptocrinus, Hall • ^< 207 



<?. argutus, n. s., "Walcott, 1883, pi. xvii, fig. 9 -' 1.207 



<?.?SM6nodos?t8,n.s., "Walcott, 1883, pi. xvii, fig. 3 2,208 



Merocrinus, n. g., "Walcott, 1883 2-3,208-209 



M. «2/pM«, n. 8., "Walcott, 1883, pi. xvii,flg.5 3,209 



