1896.] NATURAL SCIENCES OF PHILADELPHIA. 249 



155 — The origin of the pigment cells which invest the oil-drop in 

 pelagic fish-embryos. Amer. Nat., 1886, pp. 987-988. 



156 — On the value of the fin-rays and their characteristics of 

 development in the classification of the fishes, together with re- 

 marks on the theory of degeneration. Proc. U. S. Nat. Mus., 1886, 

 pp. 71-82. 



157 — Preliminary notice of the development of the toad-fish 

 Batrachus tau. Bull. U. S. Fish Comm., VI, 1886, pp. 4-8, 1 pi. 



158 — On the earlier stages of cleavage of the blastodi^k of Raia 

 erinacea. Bull. U. S. Fish Comm., VI, 1886, pp. 8-10, 1 fig. in text. 



159 — On the intra-ovarian gestation of the red-fish (Sebastes 

 marinus). Bull. U. S. Fish Comm., VI, 1886, pp. 92-94. 



160 — A theory of the origin of placental types and on certain 

 vestigiary structures in the placentae of the mouse, rat and field- 

 mouse. Amer. Nat., 1887, pp. 780-784. 



161 — The inversion of the germinal layers in Hesperomys. Amer. 

 Nat., 1887, pp. 863-864, 3 figs, in text. 



162 — Vestiges of a zonary decidua in the mouse. Amer. Nat., 

 1887, pp. 1037-1038. 



163 — The rudimentary pineal eye of chelonians. Amer. Nat., 

 1887, pp. 1126-1127. (By Geo.' Fetterolf under Prof. Ryder's 

 directions). 



164 — On a tumor in the oyster. Proc. Acad. Nat. Sci. Phila., 

 1887, pp. 25-27. 



165 — On the homologies and early history of the limbs of ver- 

 tebrates. Proc. Acad. Nat. Sci. Phila., 1887, pp. 344-368. 



166 — On the development of the common sturgeon. Amer. Nat., 

 July, 1888, pp. 659-660. (The first published account of the lar- 

 vae of Acipenser sturio developed from artificially fertilized eggs ob- 

 tained by Caesarian section of the abdomen of the female). 



167 — On the blunt-nosed sturgeon and the sense organs and 

 canals of the head of Serrajius atripinnis. University Medical 

 Magazine (Philadelphia), December, 1888, pp. 175-177. 



168 — The sturgeons and sturgeon industries of the eastern coast 

 of the United States, with an account of experiments bearing upon 

 sturgeon culture. Bull. U. S. Fish Comm., 1888, pp. 231-281, 

 plates XXXVII-LIX. 



169 — Report of operations at the laboratory of the United States 

 Fish Commission, Wood's Hole, Mass., during the summer of 1888. 

 Rep. U. S. Fish Comm., 1888, pp. 513-522. 



170 — On the fore and aft poles, the axial diflferentiation and a 

 possible anterior sensory apparatus of Volvox minor. Proc. Acad. 

 Nat. Sci. Phila., 1889, pp. 138-140. Reprint in Ann. and Mag. 

 Nat. Hist. (6), IV, p. 253. 



171 — Heterocercy in batrachia. Proc. Acad. Nat. Sci. Phila., 

 1889, p. 155. (In Amblystoma larvae). 



172 — The hypertrophied hairs on Ampelopsis. Proc. Acad. Nat. 

 Sci. Phila., 1889, p. 158. 



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