NATURAL HISTORY MISCELLANY. 319 
RESTORATION OF THE DINOTHERIUM. — I enclose an outline restoration 
of the Dinotherium, that I found lately among the St. Petersburg Trans- 
actions, presenting the latest ideas of Dr. Drandt in regard to that 
animal. — S. F. BAIRD 
"38 "fi 
WNUN ou] Jo uorg.ro1823 f 
—09—— 
MICROSCOPY. 
DEVELOPMENT oF Gas IN PnoroPLASM. — Dr. Th. Engelmann has o 
served in Arcella, a minute protozoon like an Ameba with a shell, a peri 
l 
gas can after a time be absorbed again, and reasons are given for believ- 
ing that a sort of volition is exercised by the Arcellæ in the secretion and 
