542 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fia. 6. 
FG. 7. 
GEOLOGICAL SURVEY OF THE TERRITORIES. 
EXPLANATION OF PLATE XIV. 
THAMNOCEPHALUS PLATYURUS Packard, details. 
An anterior leg. 
A middle leg. 
A posterior leg. ' 
Section through the body, showing the relation of the heart, intestine (int), and 
nervous cord (n g, a pair of nervous ganglia cut through) to the body walls 
and the appendages, /5, (6, the two last pair of endites, br, the gill. 
The male frontal appendage; 5a, end of a branch showing the twigs, and the 
wrinkles and spinules with which the appendage is armed. 
The female frontal appendage. 
Side view of the head of the female without the frontal appendage, at, first 
antenna ; at}, claspers or 2d antennze; eye,—the eye and eye stalk. 
