884 The American Naturalist. [October, 
the roof of the prominent brain case, nor in the post-ocular 
region. The frontal and parietal plates are not indicated at 
all, and the developed plates show some curious differences 
from the adult condition. The supraocular is clearly divided 
by two. transverse grooves into three scutes, of which the 
anterior is largest. I suspect that the others may be really 
post-oculars which are here displaced by the prominent eyes. 
A small scute which may unite with the loreal underlies the 
preocular. Four postfrontals are present, the external pair 
beiny much the larger ; but the single pair of prefrontals shows 
no indication of a division. The superior labials number 9, 
one more than in a specimen of the adult which I have com- 
pared. The inferior labials, except the first, are not developed, 
but the mental is well marked. The description of the head 
scutes is made from a single specimen, the only one which was 
well enough preserved to show them satisfactorily; figs. 9 
and 10. 
The egg tooth isindicated by a narrow fold which arises 
just below the ventral margin of the rostral scute. Rows of 
small papille on the jaws and palate represent the developing 
teeth. Their number and position are as in the adult 
In all male examples the paired penes were fully extruded 
immediately behind the anal plate; rudimentary penes were 
present in the females as a pair of low conical elevations in 
corresponding positions, fig.12. In well preserved specimens 
each hemipenis is a somewhat compressed organ attached by 
a narrowed base. A constriction about the middle separates a 
basal from a somewhat more swollen terminal portion, which 
ends in a pair of rounded lobes, of which the dorsal is the 
larger and arises from a thickened rim which is seen to 
become continuous below with the more ventral lobe. On the 
external side of each hemipenis is a rather prominent lateral 
lobe. 
Proximad to the median constriction the surface is dotted 
with numerous fine pointed projections, while the distal por- 
tion is covered by larger smoothly rounded papille. No 
papille whatever are present on the dorsal terminal lobe, 
which is quite smooth. Figs. 11-13. 
