214 PROCEEDINGS OF THE ACADEMY OF [Mch., 
H. (Haplocion) pasonis Dall, from Mule Canyon, El Paso county, 
Texas. 
H. (Haplocion) hamiltoni Dall, from Rio Grande Mountains, Brew- 
ster county, Texas, at an elevation of 3,500 feet, living on Selaginella 
lepidophylla, a common and conspicuous moss of western Texas. 
Subgenus HOLOSPIRA (typical group). 
Holospira goldfussi (Menke). Pl. X XVI, figs. 1-5. 
Like H. roemeri, this species belongs to the hill country bordering the 
Lower Cretaceous area in Texas. Mr. Ferriss and the writer found it 
above San Marcos, Hays county, Texas, in the 
flood-débris of Sinking Spring, and on ledges 
of its bordering limestone cliff. This is 
farther northeast than the species has hith- 
erto been found, for I have no doubt that 
the locality ‘“ Dallas,” cited by Strebel, is 
anerror. It is abundant under stones at 
the foot of the cliffs along the Guadalupe 
river, about six miles above New Braun- 
fels, Comal county. Also nearer the town, 
in the hills above the head of Comal creek. 
It varies a good deal in size: 
Length 14, diam.4 mm.; whorls 143. 
- Ovens: ities 2A “103. 
* May aly * <  -124. 
The specimens figured are from the Guadalupe. New Braunfels is 
probably the type locality. 
At the Hondo river, two miles north of Hondo, Medina county, in 
the drift-débris, we also found H. goldfussi. This is the extreme west- 
ern range of the species as far as we know. It did not occur in the 
Devil’s river region, on the Pecos or westward. 
Internal structure of H. 
goldfussi. 
Subgenus BOSTRICHOCENTRUM Strebel. 
All of the species have a small, short lamella on the axis in the 
last part of the penultimate whorl, sometimes almost obsolete, and 
some of them have a very weak basal or parietal lamella, or both. 
These lamelle are always very much smaller and lower down than 
those of typical Holospira (goldjussi, etc.). The variations are as 
follows: 
