PTs Se A = 
1894.) The Classification of Snakes. - 843 
Comparison of this table with that of the genera of Xeno- 
dontinz, shows. that ‘both present identical modifications 
of structure in the case of five of the subdivisions. Only 
_ two types, (V.and VI), of the Xenodontine have not been 
found in the Scytaline; and one, (no. VI), of the latter group 
has not been found in the Xenodontine.” 
EXPLANATION OF PLATES. 
PraTE XXVII. 
(From an unpublished Bulletin of the U. S. National 
Museum). Hemipenes of distinct types of Ophidia. The 
organ is split and the entire surface exposed. The student 
must remember that the lateral borders are artificial, and are 
continuous on the middle line behind the center of the figure 
in the projected organ. When the organ is bifurcate, but one 
branch is split; (figs. 1- 2-7-9-10-11) 
Fig. 1. Ilysia scytale L. Brazil. 
Fig. 2. Epicrates angulifer D. & B. Cuba. 
Fig. 3. Charina botte Blv. Oregon. 
Holarchus ancorus Gird. Philippine Ids. 
Oligodon subquadratus D. & B. Java. 
Bascanium constrictor L. N. America. 
Opheomorphus alticolus Cope. Peru. 
Natrix fasciata sipedon L. N. America. 
Naja haje L. melanoleuca Hallow. W. Africa, 
Fig. 10. Clotho arietans L. S. Africa. 
Fig. 11. Uropsopus confluentus Say. Texas. 
ke 
Rano os 
O oN Dop 
LETTERING. 
ss. Sulcus spermaticus; f, flounces; p, papillæ ; cl, calyces 
or calyculi (ruches); /, laminæ ; sp, spines; spl, spinules. 
Ld 
Pirate XXVIII. 
(From the Proceedings of the American Philosophical 
Society, 1894). Viscera of Heterodon platyrhinus Beauv. The 
% Reflection has caused meto drop the major division Xenodontide, and to refer 
its two subfamilies to the Colubride. 
