CHAPTER IV.
MARCH.
Paramecia--Effects of Sunlight--Pterodina patina--Curious Tail--Use of a Compressorium--Internal Structure of Pterodina--Metopidia--Trichodina pediculus--Cothurnia--Salpina--Its Three-sided Box--Protrusion of its Gizzard Mouth
MARCH.
Paramecia--Effects of Sunlight--Pterodina patina--Curious Tail--Use of a Compressorium--Internal Structure of Pterodina--Metopidia--Trichodina pediculus--Cothurnia--Salpina--Its Three-sided Box--Protrusion of its Gizzard Mouth