The Nautilus. 



Vol. III. OCTOBER, 1889. No. 6. 



RECENT ADDITIONS TO THE UNITED STATES 

 SNAIL FAUNA. 



BY H. A. PILSBRY. 



[Note. — The plate illustrating this paper will accompany the concluding^ 

 part in the next number of The Nautilus.] 



PUPA calamitosa n. sp. Fig.';. 6, 7. 



Shell minute, cyliiKlrical, very blunt at apex, chestnut-colored ; 

 whorls 4?, the first one and one-half smooth, the following regularly 

 costulate-striate, the costuhe separated by spaces wider than them- 

 selves ; last whorl abruptly turning forward, rounded beneath, en- 

 circled by a slight central constriction or furrow ; aperture about 

 one-third the total length of shell, rounded, truncated above, con- 

 tracted within; peristome thin, expanded, without crest or callous 

 thickening behind ; coluraellar margin rather dilated ; parietal wall 

 bearing two entering lamellse, one arising near the termination of 

 the outer lip, the other more deep-seated, elevated, entering less 

 obliquely; columella with a strong white deep-seated obliquely en- 

 tering fold ; outer lip with two .short w-hite lamellae. 



Alt. 1.70, diam. .80 mill. 



Two trays of this tiny si)ecies are before me. One received from 

 Henry Hemphill, collected near the mouth of San Tomas river, 

 Lower California, the other collected by Orcutt near San Diego, 

 Cal. Most specimens show the widening inward of the outer lip 

 shown in the figure. Several specimens have only one lamella on 

 the outer lip, and are rather larger than the typical form described, 

 measuring 1.90 mill. alt. The second parietal lamella is usually 

 much larger than the first, but in one or two specimens before me 



