CN EE eer 
— EET NO PPRICUN 
e SUR TESTES a ini 
Pe Te E AT 
1894.] Development of the Wing of Sterna Wilsoni. 718 
'68 Owen, Richard. On the Archeopteryx of von Meyer, 
with a description of the fossil remains of a long-tailed speci- 
men, from the lithographic stone of Solenhofen. Phil. Trans., 
Vol. 153, p. 33, 1863. 
'89 Parker, William Kitchen. On the structure and de- 
velopment of the wing in the common fowl. Phil. Trans., 
Vol. 179B, p. 385, 1889. 
'90 Parker, William Kitchen. On the morphology of the 
duck and auk tribes. Royal Irish Academy, * Cunningham 
Memoirs," No. VI, 1890. 
'97 Rosenberg, Alex. Ueber die Entwicklung des Extrem- 
ititen-Skelettes bei einigen durch Reductionen ihrer Glied- 
massen characterisirten Wirbelthieren.  Zeitsch. wiss Zool., 
xxiii, 116, 1873. 
'82* Shufeldt, R. W. Osteology of Speotyto cunicularia 
hypogeea. 12th Rept. U.S. Geol. Survey, (Hayden) p. 593, 
1882 
’82° Shufeldt, R. W. Osteology of the North American 
Tetraonide. t. c., p. 653, 1882. 
’89 Studer, Th. Die Forschungsreise S. M. S. “Gazelle” 
in der Jahren 1874 bis 1876. Herausgegeben von den hydro- 
graph. Amt der Admiralitüt. III Theil: Zoologie und Geolo- 
gie. Berlin, 1889. (Cited from R. Wiedersheim, 1893). 
’°89 Tschan, Alfr. Recherches sur l'extremité antérieure 
des Oiseaux et des Reptiles. Dissertation, Genéve, 1889. 
(Cited from Zehntner, 1890). 
93 Wiedersheim, Robert. Grundriss der vergleichenden 
Anatomie der Wirbelthieren. Dritte Auflage. Jena, 1893. 
'00 Zehntner, Leo. Beiträge zur Entwicklung von Cypse- 
lus melba nebst biologischen und osteologischen Details. 
Archiv für Naturgeschichte LVI, I, 189, 1890. 
EXPLANATION OF THE FIGURES. 
The illustrations in the text show the embryos natural size. 
It is to be noted that fig. A, showing a smaller embryo, had a 
wing more developed than fig. B. Allother figures are pro- 
jections of camera drawings and are each magnified 22 diam- 
eters. ‘ 
