442 PROCEEDINGS OF THE ACADEMY OF [1896. 



low, wide, thin, of equal height throughout, ends terminating 



bluntly ; anterior surface with about 22 broad, crowded ribs, their 



outer edges thickened, their ends bluntly denticulating the upper 



and lower margins of the jaw. 



The shell has an olivaceous tint which distinguishes it at once 



from the mostly reddish or yellowish-brown species of which the 



fauna contains so many. 



Bulimulus (Naesiotus) curtus Reibisch. Plate XV, fig. 13; Plate XVII; fig. 8. 



Bulifntihis [Ncrsioitis) curttis Reibisch, Isis, 1892, p. 9, t. i, fig. 14. 

 Bulwiulns {Nasioiiis) aniastroides Ancey, var. Anceyi Dall, Nautilus, VII, 

 p. 53, September, 1893. 



Chatham Island, near Wreck Bay, at a height of 1,600 feet, Baur ; 

 usually on the under surface of the leaves of plants. Also reported 

 from Chatham by Wolf (Reibisch) in grassy places and on the 

 trunks of trees, at from 900 to 2,000 feet, and by the U. S. Fish Com- 

 mission. 



This is very closely related to B. amastroides Ancey, of which it 

 is probably an offshoot. It has, in general, a more plicate surface, 

 ruder aspect, smaller mouth, and more angular periphery. Speci- 

 mens submitted by Herr Reibisch as representing his curtus agree 

 exactly with the types of my variety Ancey i. 



Jaw as in typical amastroides. Radula long and narrow ; formula 



1 ; rhachidian tooth tricuspid ; laterals tricuspid ; both 



11+9-9+11 



with the lateral cusps quite short ; marginals subquadrate, low, 

 widej with a longer bifid inner cusp and an outer, shorter cutting 

 edge with three or four denticles upon it. 

 Genitalia essentially as in B. nux. 



Bulimulus (Naesiotus) canaliferus Reibisch. Plate XV, fig. 14. 



Bulimuhts [Pelecosloma) canaliferus Reibisch, Isis, 1892, p. 13, t. ii, fig. 6; 

 Stearns, Proc. U. S. Nat. Mus., XVI, pp. 415, 428, 1893. 



Chatham Island, in moss and on ferns, 900-2,000 feet, Wolf, fide 

 Reibisch. 



This is a peculiar shell, characterized by its many-whorled spire, 

 short aperture, and a large umbilicus with its walls deeply exca- 

 vated, so that the groove shows as a prominent ridge on the pil- 

 lar within the aperture. In the specimen sent by Herr Reibisch 

 the edge of the aperture is hardly thickened and not at all reflected, 

 there is a thin callus deposit over the body, but no trace of a parie- 

 tal tooth. The species, with a totally different surface, has some- 

 what the form of B. rugiferus, but with a less slender and shorter 



