504 The Embryology of Hylodes Martinicensis 



Saeasin, p. u. F., go. — Ergebnisse naturwiss. Forschungen auf Ceylon in den 

 Jahren 1884-85. Bd. II, Wiesbaden, 1887-90. Zur Entwickelungsgesch. 

 u. Anat. der ceylonischen Blindwiilile, Ichthyophis glutinosus. 



Selenka, Emil, 82. — Der embryonale Excretionsapparat des liiemenlosen Hy- 

 lodes martinicensis. Sitzungsber. d. kon. preuss. Akad. d. Wiss. zu 

 Berlin, 1882, p. 117. 



Steenstrup. 46. — Rapport sur L'histoire naturelle de quelques Amphibes de 

 Danemark. KieL 1846. 



Wilder, H. H., gg. — Desmognathus fusca (Rafinesque) and Spelerpes bilineatus 

 (Green). Am. Nat, XXXIII, p. 231. 



Wilson, E. B., g/^. — The Embryologial Criterion of Homology. Biol. Lectures 

 delivered at the Marine Biol. Lab. of Wood's Holl, 1894. 



ZiEGLER, H. E., 02. — Lehrbuch der vergl. Entwickelungsgesch. der niederen 

 Wirbeltiere. Jena. 



EXPLANATION OF PLATES. 



The figures are taken from camera drawings. The embryos are magnified 

 in Figs. 1 to 10, inclusive, about thirteen and a half diameters, in Figs. 11 

 to 14, inclusive, a little more than thirteen and a half diameters, and in Fig. 

 15 about twenty-eight diameters. 



PLATE I. 

 Two-celled stage. Upper pole showing the beginning of the second 



Two-celled stage. Lower pole. 

 Later stage of segmentation. Upper pole. 

 Same egg as in Fig. 3. Lower pole. 

 Stage showing blastopore. 



Stage I. Young embryo with the blastopore almost closed. 

 Stage II. Posterior end of the embryo, showing the anus. 

 Stage IV. Head end. 

 Same embryo as in Fig. 8. Tail end. 

 Stage VI. 



PLATE II. 



Fig. 11. Stage IX, as seen from the side. 



Fig. 12. Stage XII. 



Fig. 13. Stage XIII. 



Fig. 14. Stage XIV. 



Fig. 15. Stage VIII. Anterior end of the embryo, as seen from the ventral 



side, when cut off the yolk. Y, point where the yolk has been cut away from 

 the gut. 



