THE NAUTILUS. 53 



A NEW FLORIDIAN HELICINA. 



BY H. A. PILSBRY. 



Helicina tantilla n. sp. 



.Shell very small, much depressed, finely and weakly striate. 

 Spire low, convex, with rather straight outlines. AVhorls 3^, rather 

 slowly widening, the last much wider, rounded at the periphery, 

 convex beneath, impressed around the central callus. Aperture 

 quite oblique, semi-circular, the lip obtuse, not noticeably expanded. 

 Umbilical callus but slightly convex, not filling the cavity to the 

 level of the surrounding convexity of the base. Alt. 1.3, diam. 

 2.5 mm. 



Palm Beach, Florida. Type no. 77349 A. N. S. P., coll. by H. 

 A. Pilsbry. 



This tiny Helicina is quite distinct from all the Antillean species 

 I have been able to compare. A single bleached specimen was 

 gathered in June, 1899, with other small land shells, in the woods 

 about a quarter-of a mile from the Atlantic beach. I did not notice 

 it at the time, or I would have made search for more ; it was only 

 detected when the material was being sorted at home. No further 

 specimens have turned up in the three years since this one was taken, 

 and it is now published in the hope that some reader of the NAU- 

 TILUS who may visit that most beautiful of the winter resorts of 

 east Florida, may search for the species, and complete the descrip- 

 tion by finding living specimens. It has no resemblance to the 

 young of H. orbiculata. 



NEW LAND MOLLUSKS FEOM THE JAPANESE EMPIRE. 



BY H. A. PILSBRY. 



Alycaus vinctus n. sp. Moderately umbilicate with conic spire 

 and the general aspect of other described Japanese species of 

 AJycceus. Whorls 3, the first 1^ smooth, corneous-brown, follow- 

 ing whorls dull, whitish, sculptured with lamellar rib-striae and finer 

 spiral threads, the riblets as usual much more crowded on the back 

 of the last whorl. Constriction of neck rather strongly marked, 

 and with the portion following it, smooth, free from riblets, or with 

 weak striae only. '' Tube " long, reflexed, lying in the suture. 



