220 PROCEEDINGS OF THE ACADEMY OF [Mch., 
Subgenus METASTOMA Strebel. 
Holospira roemeri (Pfr.). Pl. XXVI, figs. 10-18. 
This peculiar snail ‘inhabits the hilly border of the 1,000 foot elevation 
which roughly defines the southeastern limit of the Lower Cretaceous 
area in Texas. It has not been observed northeast of New Braunfels. 
Thence it has been traced westward in Medina county, and near the 
Rio Grande, at Devil’s river and the Pecos. We know nothing of its 
distribution northward upon the “Edwards Plateau,” since only its 
lower scarps have been explored. Westward we have it from El Paso, 
where Ferriss got specimens on Franklin Mountain in 1902; and in 
New Mexico Rehn and Viereck found it in Alamo Canyon, near Alamo- 
gorda, Otero county, in the eastern range of the Cordillera. 
The specimens from El Paso are large, like those of the Pecos. An 
average one measures, length 15.5, diam. 4.5 mm.; whorls 14. Those 
from Alamo Canyon are smaller, 12 to 13 mm. long, 4 wide. They 
vary but little in size. 
In the canyon of the Pecos river, in Valverde county, Texas, above 
and below the High Bridge (figs. 16, 17, 18), the specimens are larger 
than at any other locality, and have more whorls for their length. The 
base is narrowly and deeply excavated, and the last whorl is very 
strongly sigmoid and projects in a longer neck than in the shells of 
central Texas. Most of the shells measure 15 to 16 mm. long, 4 wide, 
few being larger or smaller. 
Length 17, diam. 4.7 mm.; whorls 154. 
‘cc 16, “ 4 “ ‘“ 15k. 
a 15.5, “og “ 6 143. 
« 15, ewe | “ 6 15. 
ce WO ie 4B, / “144, 
In the drift-débris of Devil’s river, Valverde county, Texas, about 
four miles from its mouth, a large majority of the shells are 14 to 15 
mm. long, with 144 to 154 whorls. The base and neck are like the 
larger shells of the Pecos. 
Length 15.2, diam. 4 mm.; whorls 16. 
(zs 1 “ 4 (a9 fe 15. 
ag 1 a aia Ma an een 
Mido: Veg * a ae 
” 1.5, 0 ae 4 SBEye 
“cc 13.8, ce 4 (73 (73 141, 
“““ 14, (73 ae ““ cc 14}, 
ce 12.9, ce 4 a3 ce 133. 
