90 THE NAUTILUS. 



where the shell reaches its greatest diameter. After that the whorls 

 are nearly smooth, rather glossy, and the shell diminishes slowly in 

 diameter to the base. The last two whorls have retractive axial 

 ribs which gradually increase in strength, and are strongest on the 

 straight part of the last whorl and base. The last whorl is some- 

 what, compressed laterally and projects, carrying the aperture well 

 forward. Aperture is very shortly ovate, almost circular, light brown 

 within. Peristome very broad, flatly reflexed, white. The internal 

 axis is smooth throughout, rather slender, tapering downwards, with 

 a diameter of about 1 mm. in the widest part. 



Length 23.5, greatest diam. 6 mm.; whorls 14. 



Length 22.6, greatest diam. 6.3 mm.; whorls 13^. 



Length 20, greatest diam. 5.8 mm.; whorls 12|. 



Sanderson, Terrell Co., Texas, on a low limestone ledge along the 

 railroad. Elevation 2800-2900 ft. Types no. 107001 A. N. S. P., 

 collected August 25, 1912 by Messrs. Morgan Hebard and J. A. G. 

 Rehn. 



This handsome Holospira is most closely related to H. semisculpta 

 Stearns, which was described from a canyon above San Carlos, 

 Chihuahua, a place on the Mexican side of the Great Bend of the 

 Rio Grande. Dr. Ball and Dr. Bartsch have kindly compared 

 specimens with the type of semisculpta, and report that the new 

 species " differs in the profile, which in your shell is more contracted 

 toward the base, rendering it spindle-shaped, while the former is 

 more cylindrical. The ribs in yours do not extend over so many of 

 the basal whorls, and the expanded peristome gives it a very distinct 

 appearance. It is doubtless a distinct species." 



With the Holospira were found specimens of Polygyra texasiana 

 texasensis and a Succinea. 



SHELLS OF SOUTHEAST MISSOURI 



BY P. A. SAMPSON, COLUMBIA, MO. 



During a late trip through southeast Missouri I had a few hours' 

 time for collecting shells, and the result, combined with some former 

 collecting, is here given. 



