1893.] 
Fig. 
Eggs of Pityophis Melanoleucus. 885 
EXPLANATION OF Prates XIX, XX. 
Pityophis melanoleucus. 
ig. 1—Cluster of seven eggs represented as they naturally 
cohere. a—point at which an eighth egg was at- 
tached. Natural size. 
. 2—Surface cracking of the calcareous crust—from an 
equatorial region. x 10. 
. 8— Vertical section of a small portion of the egg shell 
showing a small part of five laminæ. x 800. 
. 4—Several fibres of different sizes after being dried and 
mounted in glycerin. The lumens are filled with 
air. x 800. 
. 5—Surface view of a small portion of a lamina x 170. 
. 6—4 few isolated fibres x 500. 
. 7-8—Two views of embryos in their natural positions 
on the yolk. Natural size. 
. 9—Left side of head of an embryo showing the scutes. 
xX; p S81 
. 10—Dorsal view of the same x 7; p. 881. 
. 11—Anal plate and penes of a male x 8. 
. 12—Same region of a female. a—rudimentary penes. 
x 8. 
13—Lateral (external) view of a hemipenis x 7. 
+ 
