18 PROCEEDINGS OF THE ACADEMY OF [1897 



DESCRIPTIONS OF NEW SOUTH AMERICAN BULIMULI. 

 BY H. A. PILSBRY. 



The species described below have been found during the writer's 

 work on the group in the Manual of Conchology. Illustrations of 

 them will appear in due course in that series of monographs. 



Bulimulus rushii, gorritiensis and corumbaensis belong to the typi- 

 cal section of the genus, characterized by densely wave-wrinkled 

 apical sculpture. B. pachys, chrysaloicles, glyptocephalus and sar- 

 cochrous have separated, straight vertical riblets on the nepionic 

 whorls, much as in the Galapagos group Ncesiotes, or the northern 

 Mexican and Lower Californian groups. 



Bulimulus rushii n. sp. 



Shell umbilicate, globose- ovate, rather thin but solid, light yellow- 

 ish. Surface with inconspicuous growth-wrinkles and extremely 

 fine, close incised spiral strice, visible only above the periphery. 

 Spire very short, conic, the apex obtuse. Whorls slightly over 6,. 

 moderately convex, the suture shallow but well marked. Aperture 

 slightly oblique, ovate, a trifle over half the total length of shell ; 

 peristome simple, unexpanded, the columellar margin broadly dilated 

 above. Alt. 19J, diam. 14 mill.; alt. of aperture 10 mill. 



Maldonado, Uruguay (Dr. W. H. Rush). 



Apparently allied to B. sporadicus and B. vesicalis, especially to 

 the stouter variety of the latter species ; but conspicuously different 

 in the very short spire, globose form and widely open, deeply pene- 

 trating umbilicus. By an inadvertent exchange of labels, a wrong 

 locality was given in the catalogue of Dr. Rush's shells in the Nau- 

 tilus. It has been figured but not described in the Manual of Con- 

 chology, pi. 12, fig. 47. 



Bulimulus gorritiensis n. sp. 



B. gorritiensis Pils., Nautilus x, p. 78 (name only). 



Shell perforate, ovate-turreted, thin and fragile, corneous-brown 

 or dirty corneous-whitish. Surface slightly shining, sculptured with 

 irregular and rather coarse wrinkles of growth. Spire elevated, 

 rather slender, the lateral outlines straight ; apex quite obtuse, the 



