WRITINGS OF C. D. WALCOTT. 187 



Oraptolifhus, Liunsens, 1736 20 



O. annectans, n. s., Walcott, 1879 20 



Dendrograptus, Hall, 1865 20 



D. simplex, d. 3., Walcott, 1879, pi. i, flgs. 5, 5 a, b, and 6 20 



D. tenuiramosus, n. s., "Walcott, 1879, pL i, fig. 4 21 



B. compactus, n. s., "Walcott, 1879, pl.i, fig. 1 21 



Sagenella, HaU, 1852 22 



S. ambigua, n. s., "Walcott, 1879, pL i, figs. 3, 3 a 22 



Modiolopsis, Hall, 1847 22 



M. cancellata, n. s., Walcott, 1879, pLi, figs. 8,8 a 22 



Orthoceras, Brej-nius, 1732 ^ 22 



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



Beyrichia cincinnatiensis, Miller 23 



Triarthrus becki, Green, 1832 23-24 



Metamorphoses oi 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 slate 34-38 



11. 



Walcott, C. D. The Permiau and other Paleozoic Groups of tlie 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 Relating to its Organization, 

 <^Bull. Mu8. 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, i^p. 394-395. November. New Haven, 1881. 



14. 



Walcott, C. D. Description of a New Genus of the The Order Enripterida froni the 



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



Haven, 1882. 



Page. 

 Echinognathus, n. g., Walcott, 1882. 



E. clevelandi.u. 8„ 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, pi. xviL 



Page. 



Glyptocrinus, HaU 1, 207 



Gf. argutus, n. a., Walcott, 1883, pi. xvii, fig. 9 1,207 



GJ subnodosus, n. s., Walcott, 1883, pi. xvii, fig. 3 2,208 



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



M. typus, u. 8., Walcott, 1883, pi. xvii, fig. 5 3,209 



