Occasional Papers of the Museum of Zoology 47 
points of light. For the same reason, the number of cusps on 
the outermost marginals, and perhaps the exact number of the 
teeth themselves, is indeterminable without resort to ultra- 
microscopic methods. On the first radula, in which the basal 
membrane disintegrated while under examination, so that the 
teeth spread out quite evenly in all directions, 1 thought I 
could count 15 marginals, in the other but 13. All of the inner 
teeth are quite of the same shape as those of G. gundlachi. 
The jaw is also very similar in the two species, but that of 
G. sterkit is even more nearly semicircular in outline. 
Guppya gundlachi, subspecies orosciana von Martens (1892). 
—Two specimens, found in humus among rocks near Laguna 
de Catemaco. This mountain subspecies agrees with typical 
gundlacht in the prominence of the spiral lines and in general 
shape, but differs in the marked carination of the last whorl. 
However, specimens with a distinct angulation were also found 
in the lowlands (H, I, a) among those with more rounded 
whorls. 
Guppya (Habroconus) trochulina (Mo.) (1851). 
Helix selenka: Pieiffer (1866). 
Thirty-four specimens ; adults on leaves of palms and trees, 
in lowland forests (H, I, b) and in savannah forests (H, III, 
b); juvenile specimens from elephant-ears along Arroyo 
Hueyapam (H, IH, a); and one dead specimen from humus 
amongst rocks near Laguna de Catemaco. An arboreal species 
found with Helicina, Drymaeus, and Oxystyla. 
The jaw (fig. 5) and radula of this form were also examined 
from two dried animals. The jaw is very similar to that of 
the general group. The formula of the radula (fig. 4) is: 
I II 1S. TO S35) O-2 
Og eg WE = Se 
3 3 2 3 + I 
or (48, 45)-11-1-11-(48, 45). The proximal portion of the 
. 
J 
