422 Charles Emerson Beecher. 



31. The development of Terebratalia obsoleta Dall. Ibid., vol. ix, pp. 392- 

 399, pis. ii, iii. 1893. 



33. Development of the brachial supports in Dielasma and Zygospira. 



[Beecher and Schuchert.] Proc. Biol. Soc. Washington, vol. viii, 

 pp. 71-78, pi. x. 1893. 



34. Larval forms of Trilobites from the Lower Helderberg group. This 



Journal (3), vol. xlvi, pp. 142-147, pi. ii. 1893. 



36. On the thoracic legs of Triarthrus. Ibid., vol. xlvi, pp. 367-370. 1893. 



37. On the mode of occurrence, and the structure and development of 



Triarthrus Becki. Amer. Geologist, vol. xiii, pp. 38-43, pi. iii. 1894. 



38. The appendages of the pygidium of Triarthrus. This Journal (3), vol. 



xlvii, pp. 298-300, pi. vii. 1894. 



39. Further observations on the ventral structure of Triarthrus. American 



Geologist, vol. xv, pp. 91-100, pis. iv, v. 1895. 



40. Structure and appendages of Trinucleus. This Journal (3), vol. xlix, 



pp. 307-311, pi. iii. 1895. 



41. The larval stages of Trilobites. American Geologist, vol. xvi, pp. 166- 



197, pis. viii-x. 1895. 



42. James Dwight Dana. Ibid., vol. xvii, pp. 1-16, portrait, pi. i. 1896. 



43. The morphology of Triarthrus. This Journal (4), vol. i, pp. 251-256, 



pi. viii. 1896. 

 Reprinted in Geological Magazine (London), dec. IV, vol. iii, pp. 193- 

 197, pi. ix. 1896. 



47. Outline of a natural classification of the Trilobites. This Journal (4), 



vol. iii, pp. 86-106, 181-207, pi. iii. 1897. 



48. The systematic position of the Trilobites. [Kingsley and Beecher.] 



American Geologist, vol. xx, pp. 33-40. 1897. 



49. Development of the Brachiopoda. III. Morphology of the Brachia. 



Bulletin 87, U. S. Geol. Surv., chapter iv, pp. 105-112. 1897. 



50. Origin and significance of spines. This Journal (4), vol, vi, pp. 1-20, 



125-136, 249-268, 329-359, pi. i. 1898. 



51. Othniel Charles Marsh. Ibid., vol. vii, pp. 403-428. 1899. 



The same, abridged, with alterations. Bull. Geol. Soc. America, vol. xi, 

 pp. 521-537, and American Geologist, vol. xxiv, pp. 135-157. 1899. 



52. Trilobita. In Textbook of Palaeontology, by Karl A. von Zittel. Trans- 



lated and edited by Charles E. Eastman. Vol. I, pp. 607-638. 1900. 



58. Studies in evolution : mainly reprints of occasional papers selected from 

 the publications of the Laboratory of Invertebrate Paleontology, Pea- 

 body Museum, Yale University. Pp. xxiii and 638, 34 plates. New 

 York, 1901. 



60. Discovery of Eurypterid remains in the Cambrian of Missouri. This 

 Journal (4), vol. xii. pp. 364-366, pi. vii. 1901. 



64. The ventral integument of Trilobites. This Journal (4), vol. xiii, pp. 

 165-174, pis. ii-v. 1902. 



66. Palaeozoic Phyllocarida from Pennsylvania. Quart. Jour. Geol. Soc. 

 London, vol. lviii, pp. 441-449, pis. xvii-xix. 1902. 



68. Observations on the genus Romingeria. This Journal (4), vol. xvi, pp. 

 1-11, pis. i-v. 1903. 



70. Extinction of species. Encyclopedia Americana, vol. iv. (In press.) 



