124 AMERICAN NATURALIST. [Vol. XXXVIII. 



of the trunk. They empty into the Ductjis cnvieri near the 

 entrance of the subclavian. 



Thus, although it is seen that many Amphibian eggs are on 

 the border between the holoblastic and meroblastic types, and 

 although they form interesting transitions between the two, 

 especially useful in breaking down artificial distinctions, yet it 

 must be confessed that through the observations here recorded 

 the eggs of Desmognathus are at first almost typically holo- 

 blastic, although in the later relation of embryo to yolk they 

 greatly resemble meroblastic embryos, {cf. Fig. 3 of this paper 

 with the following in Ziegler's text-book, 1902, Fig. 304.) 

 Hypogeophis (Brauer) ; Fig. 188 herring (Kupffer). 



In concluding this paper I wish to present a few sections 



taken through advanced embryos of Desmognathus (the 1898 

 material) which will show the actual relation of the embryo to 

 the large yolk mass and will demonstrate its cellular character in 

 the later stages. 



Pig. 4 IS a sagittal section of an advanced embryo, and shows 

 the median relationships in the ventral half, but strikes the 

 bram and the dorsal portion somewhat laterally. By combining 

 several adjacent sections, the pharynx, oesophagus and anus 

 were completed. In this the peritoneum may be followed 

 dorsally as a continuous line investing the rectum, the yolk mass 

 and the oesophagus, and enclosing a portion of the coelom ; and 

 vtntrally around the yolk mass enclosing a large coelomic space 



