1906.] NATURAL SCIENCES OF PHILADELPHIA. 131 
and identity of the several forms. Several times since the first visit 
of one of us to Texas, in the winter of 1885-86, they have been carefully 
studied anew, with each time larger materials and better knowledge 
of the country. To the specimens already in the museum of the 
Academy about 1,000 were added by our expedition of 1903, from 
central and western Texas and Indian Territory. 
The series is divisible into two species, B. dealbatus and B. alternatus 
marie; the first further split into numerous local races or subspecies. 
The typical forms of B. alternatus and B. schiedeanus do not, so far 
as we know, extend into Texan territory; both were described from 
Mexico where they range over a large area. B. patriarcha W. G. B., 
unquestionably a form of schiedeanus, was also described from Mexico 
(Buena Vista), and we have seen no specimen of it from within our 
borders.® 
In the United States, Bulimulus has not been found west of the 
neighborhood of El Paso. We know nothing of what forms live in 
the State northwest of a line from Austin,to San Antonio, or north of 
the Southern Pacific Railroad from San Antonio westward to El Paso. 
Beyond some extension of the ranges of B. dealbatus mooreanus and 
B. alternatus marie, little is to be expected from the great unknown 
area. 
The following forms are now recognized: 
1. B. dealbatus mooreanus W. G. B., Pfr. Arid region of central and 
south Texas. 
2. B. d. liquabilis Rve. Eastern and southeastern Texas. 
. B. dealbatus Say. Alabama to Kentucky, west to Kansas. 
4. B. d. ozarkensis P. and F. Northern and western borders of the 
Ozark uplift. 
5. B. d. ragsdalei Pilsbry. Bluffs of Red river and southwestern 
Texas. 
. B. d. pecosensis P. and F. Southwestern Texas. 
. B. d. pasonis Pilsbry. El Paso, western Texas. 
. B. alternatus marie (Albers). Southern Texas. 
oN) 
CoN mS 
Of these forms, the anatomy of B. d. mooreanus, B. d. liquabilis, 
B. d. ragsdalei, B. d. pecosensis and the Val Verde county race of B. 
alternatus marie has been examined more or less fully. All agree in 
having a rather short, fusiform penis with a basal sheath which in- 
8 We do not mean to deny that the forms mentioned occur in Texas. The coun- 
ties along the Rio Grande west of the mouth of the Pecos are still unexplored for 
shells, and B. schiedeanus especially may turn up in this region. 
