28 4 



INEZ WHIPPLE WILDER. 



granules (Hilton, '09), we see again the approach to an inter- 

 mediate position of the Desmognathus egg between the holo- 

 blastic and meroblastic types, this mass of large cells of a purely 

 nutritive character being comparable to the undivided yolk mass 

 of the meroblastic egg. The tardy segmentation of this mass of 



10 b 



a 



FIG. 12. Horizontal sections (viewed dorsally) of (a) terrestrial larva at time 

 of hatching (stage A, cf. Plate I., Figs, i and 2), (b) terrestrial larva 3 days old 

 (stage C, cf. Plate I., Figs. 5 and 6), (c) terrestrial larva 15^ days old (stage F, cf. 

 Plate I., Fig. 9). Lines lob, IQC, and lod indicate respectively the levels of the 

 cross sections shown in Fig. 10. Bl, bladder; d, duodenum; gbl, gall bladder; ini, 

 left loop cf intestine; in r , right loop cf intestine; I, liver; p. pancreas; st, stomach; 

 r, rectum; y, yolk mass; yg, yolk granules in the lumen of the yolk mass. Drawn 

 with Abbe camera. X 



yolk material, which Hilton pointed out, and the later breaking 

 down of the cell walls of these large nutritive cells, which seems 

 to appear in some cases, corroborate this view. 



