1896.] NATURAL SCIENCES OF PHILADELPHIA. 241 



15 — The mechanical genesis of tooth forms. Dental Cosmos, 

 XX, 1878, pp. 465-472. Abstract by Dr. C. N. Pierce of " On 

 the mechanical genesis of tooth forms." Proceedings of the Acad- 

 emy of Natural Sciences of Philadelphia, 1878, pp. 45-80, 3 figs. 



16 — Addenda to etiological views expressed in a paper " On the 

 mechanical genesis of tooth forms." Dental Cosmos, XX, 1878, pp. 

 472-474. 



17 — The gigantic extinct armadillos and their peculiarities, with 

 a restoration. Popular Science Monthly, XIII, 1878, pp. 139-145, 

 4 figs, in text. (Discusses the mechanical genesis, degeneration and 

 coalescence of vertebral centra). 



18 — Morphological notes on the limbs of the Amphiumidae as in- 

 dicating a possible synonymy of the supposed genera. Proc. Acad. 

 Nat. Sci. Phila., 1879, pp. 14-15. (Points out the variation in the 

 number of digits in the same specimen, rendering the genus Murce- 

 7iopsis untenable). 



19 — Further notes on the mechanical genesis of tooth forms. 

 Proc. Acad. Nat. Sci. Phila., 1879, pp. 47-51, 1 fig. in text. 



20 — Notice of a new pauropod. Proc. Acad. Nat. Sci. Phila., 

 1879, p. 139. 



21 — Description of a new species of Chirocephalus. Proc. Acad. 

 Nat. Sci. Phila., 1879, pp. 148-149, 3 figs, in text. (Chirocephalus 

 holmanii sp. nov.). 



22 — Honey glands on Catalpa leaves. Proc. Acad. Nat. Sci. 

 Phila., 1879, p. 161. 



23 — The larva of Eurypauropus spinosus. Proc. Acad. Nat. Sci., 

 1879, p. 164. 



24 — Description of a new branchipod. Proc. Acad. Nat. Sci. 

 Phila., 1879, pp. 200-202, 1 fig. (Streptocephalns sealii, sp. nov.). 



25 — The gemmule vs. the plastidule as the ultimate physical 

 unit of living matter. Amer. Nat., 1879, pp. 12-20. 



26 — On the origin of bilateral symmetry and the numerous seg- 

 ments of the soft rays of fishes. Amer. Nat., 1879, pp. 41-43. 



27 — Ryder on the mechanical genesis of tooth forms. Amer. 

 Nat., 1879, pp. 446-449. (Abstract with comments by Prof. E. D. 

 Cope, of" On the mechanical genesis of tooth forms." Proc. Acad. 

 Nat. Sci. Phila., 1878, pp. 45-80. And " Further notes on the 

 mechanical genesis of tooth forms." Loc. cit., 1879, pp. 47-51). 



28 — On the destructive nature of the boring sponge, with obser- 

 vations on its gemmules or eggs. Amer. Nat., 1879, pp. 279-283. 



29 — Strange habitat of a barnacle on a garpike. Amer. Nat., 

 1879, p. 453. {Platylepas decomta Darw. on Lepidosteus). 



30 — An account of a new genus of minute pauropod myriapods 

 (Eurypauropus spinosus). Amer. Nat., 1879, pp. 603-612, 1 pi. and 

 2 figs, in text. fEurypauropodidae, fam. nob. Eurypauropus spin- 

 osus gen. et. sp. nov.). 



31 — Successive appearance of Chirocephalus and Strejitocephalus 

 in the same pond. Amer. Nat., 1879, p. 703. 



