344 
MR. J. DiiLRYMPLE’S DESCRIPTION OF AN INFUSORY 
Von Baer, Von Siebold, Bischoff, Barry and a host of others. The rapidity of the 
processes, as well as the great clearness with which the changes can be seen, are very 
favourable for observation ; while the viviparous nature of the animal assimilates the 
conditions more to that of higher organizations, than where development takes place 
in a true egg expelled from the body of the mother, and dependent upon its own vis 
insita alone. 
Explanation of the Plates. 
PLATE XXXIII. 
Fig. 1. Exhibits the animalcule, of which the preceding pages are a description, seen 
in the position most generally observed, viz. in profile. 
A. The ciliated coronet that surrounds the head. 
B. The mouth or anterior aperture. 
C. The pink eye. 
D. The ganglionic mass on which the eye is placed. 
E. The jaws or mandibles. 
F. The pharyngeal cavity. 
G. The oesophagus. 
H. Salivary or pancreatic glands. 
I. The stomach. 
K. The circulatory apparatus. 
L. The ciliated tags appended thereto. 
M. Muscles. 
N. Contractile or pulmonary sac. 
O. Ovary. 
P. Ovisac surrounding. 
Q. An embryo. 
R. Circular bands on the integument, 
S. Vaginal or posterior orifice. 
T. Lateral aperture, ciliated or setaceous. 
Fig. 2. Represents the animalcule seen frontwise or on the abdominal aspect ; organs 
symmetrically placed. 
A. The axis of the jaws. 
B B. Muscles moving the rami of the jaws. , 
C. The pharynx. 
D. The oesophagus. 
E. Salivary glands. 
F. Circulatory apparatus, with 
