1906.] NATURAL SCIENCES OF PHILADELPHIA. 563 



Petit Jean Mountains, south from Magazine Mountain, type loc; 

 also Magazine Mountain, chiefly on the north side of the summit, 

 buried in earth under dead leaves on shady hillsides, the apex only 

 exposed. Ferriss and Pilsbry, March 28 to April 2, 1903. Also Sugar- 

 loaf Mountain, on the boundary between Arkansas and Indian Terri- 

 tory. 



In the field this form is instantly recognizable by the black lines of 

 the pallial region, sharply defined against a pale ground, and readily 

 visible through the shell. In spirit this black pigment remains un- 

 changed. 



Omphalina friabilis (W. G. Binn.). 



Arkansas: Mablevale, Pulaski Co. (C. W. Johnson) ; Rocky Comfort, 

 Little River Co. (Ferriss, 1900). Mr. Sampson ('93, p. 181) reports 

 friabilis from several other counties, but as his list does not mention 

 0. fuliginosa it is almost certain that he included the two species in his 

 records. 



Texas: San Marcos, Hays Co., under dead leaves in the thicket along 

 a rill on the northeast side of San Marcos River, abundant. 



The Anatomical distinctions between 0. friabilis and fuliginosa will 

 be discussed elsewhere. The shells may be distinguished by the smaller 

 apex, narrower and more closely coiled early whorls of /ria6i7is, in which 

 moreover the apical whorls are smooth, polished, whitish-corneous and 

 umvorn, while the summit in southwestern fuliginosa is invariably 

 worn, the cuticle removed from the earlier whorls. 



Euconulus ohersinus dentatus (Sterki). 



Nautilus, XII, p. 116, February, 1899. 



Magazine Mt., on the north side of the summit; also under stones on 

 the hills along the creek south of Blue Mt. Station; both in Logan Co., 

 Ark. Two young specimens from each place. This form was also 

 taken at Hardy, Ark. (Ferriss). 



These two are, we believe, the only localities known for dentatus west 

 of the Mississippi. 



PHILOMYCID^. 



Philomyous oarolinensis (Bosc). 



Chadwick, Mo.; Roger and Magazine Mountain, Ark.; Wyandotte, 

 Sugar-loaf Mountain, Vinita and Wister, I. T. 



ENDODONTIDu53. 



Pyramidula alternata (Say). 

 Arkansas: Magazine Mt., Logan Co., from the summit to the base 



