124 BULIMULUS-NAESIOTUS. 



Bulimulus (Pleuropyrgus*) terebra REIBISCH, Isis, (Oct.) 1892, p. 

 24, t. ii, fig. 3. 



" This form is much more slender than P. chemnitzioides Fbs., 

 which is well represented by the figures 6a, 6b, plate 9, Proc. Zool. 

 Soc. London, 1850. Aside from the differences in color and sculp- 

 ture, the surface of Forbes' species is dull in fresh, unrubbed, perfect 

 specimens ; the ribs in the latter species are comparatively sharp, 

 thread-like, regular, and somewhat distant, the interspaces being 

 perceptibly wider than the ribs are thick." (Stearns). 



" The specimen of B. terebra (pi. 24, fig. 39) submitted by Herr 

 Eeibisch is slightly larger, more dull colored and has a more evident 

 umbilicus than the typical specimens of Habeli which were obtained 

 in a more unfavorable station, but the differences do not appear to 

 be sufficient to be worthy of a specific name, at least judging from 

 material I have been able to study. No specimens of B. Habeli 

 containing the soft parts have been received by me. The nepionic 

 whorls are usually decorticated and smooth, but when perfect show 

 extremely fine transverse ribbing. In the single specimen I have 

 seen of the variety terebra Reibisch, the nepionic ribbing is coarser 

 and more evident." (Dall). 



B. CHEMNITZIOIDES (Forbes). PI. 24, figs. 44-48. 



Shell subrimate, turrited, thin but rather solid, purple-brown with 

 a yellow band under the suture and another at the periphery, or 

 corneous-yellow with a chestnut band, the base also chestnut. 

 Sculpture of rather strong vertical riblets separated by intervals of 

 sometimes the same, sometimes greater width, with slight traces of 

 spiral striation above. Whorls 12-15, convex, the last rounded at 

 the periphery. 



Aperture irregularly ovate, its length contained about 4J times 

 in that of the shell; peristome thin, the outer lip unexpanded, 

 slightly bent forward in the middle, columellar lip short, triangularly 

 and flatly dilated above ; columella straight, not truncated at base. 



Alt. 19, diam. 4, length of aperture 4 mill. (Pfr.). 



Alt. 13-5, diam. 3*7, length of aperture 3'8 mill. 



Chatham Island, at 300-600 feet elevation, with B. perspeetivus 

 Pfr., on rocks and under stones (Wolf), on the leaves of plants at 

 1600 feet elevation, near the southwest end of Chatham Island (Dr. 

 Baur ; also Kellett, Habel and the U. S. Fish Commission). 



