380 The American Naturalist 
ZOOLOGY. 
Reproduction of Urnatella.—Statoblasts have not hithert 
found in this curious type of the Polyzoa, first described by 
Mr. Edward Potts has lately succeeded in having the animal reprodu 
itself by germination from the jointed stems which remain after 
polyp-heads have died down. “About the middle of September 
I gathered from the bed of the Schuylkill canal, below Flat Rock D: 
some sticks bearing colonies of Leidy’s Urnatella. The heads ast 
soon died ; but as no statoblasts have yet been discovered to be 
duced by this polyzoon, I kept the jointed stems under the impres 
that they took the place of gemmules and would reproduce thems 
in the spring: On February 1st I found them thus rejuvenating 
selves, and I now have a good stock of Urnatellas.”’ e 
is an extract from a note by Mr. Potts to one of the- 
editors.—R. 
The Growth of Corals.— Alexander Agassiz has figured 
specimens of coral, natural size, taken from the shore end 
XX., No. 2.) 
_ The Changes of the Salamander Diemyctylus virid 
—I have now demonstrated the following facts with reference 
Amphibian: 1. The eggs are internally fertilized. 2. The 
have the form and coloration of the adult aquatic ones. 
non-ciliated. 6. In the terrestrial forms the oral epithelium is 
-—Simon H. Gace. 
