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). PI. XXVI, figs. 1-5. 



I jke H. rocmeri, 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-debris 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 

 an error. It is abundant under stones at 

 the foot of the cliffs along the Guadalupe 

 river, about six miles above New Braun- 

 Internal structure of H. f^j Qqj^-^^| pountv. Also nearer the town, 



goldfussi. . ' . ' ' 



in the hills above the head of Comal creek. 



It varies a good deal in size: 



Length 14, diam. 4 mm.; whorls 14f. 

 10, " 3.9 " " m. 



11.5, " 3.1 " " 12^. 



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-debris, 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. 



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 lamellae are always very much smaller and lower down than 

 those of typical Holospira {goldfussi, etc.). The variations are as 

 follows : 



