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. dealhatus and B. alternatus 

 marioe; 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. dealhatus mooreanus and 

 B. alternatus marioe, little is to be expected from the great unknown 

 area. 



The following forms are now recognized : 



1. B. dealhatus mooreanus W. G. B., Pfr. Arid region of central and 



south Texas. 



2. B. d. liquahilis Rve. Eastern and southeastern Texas. 



3. B. dealhatus Ssiy. 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. 



6. B. d. pecosensis P. and F. Southwestern Texas. 



7. B. d. pasonis Pilsbry. El Paso, western Texas. 



8. B. alternatus marioe (Albers). Southern Texas. 



Of these forms, the anatomy of B. d. mooreanus, B. d. liquahilis, 

 B. d. ragsdalei, B. d. pecosensis and the Val Verde county race of B. 

 alternatus marioe has been examined more or less fully. All agree in 

 having a rather short, fusiform penis with a basal sheath which in- 



* 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. 



