1896.] NATURAL SCIENCES OF PHILADELPHIA. 435- 



which he identified it. In color, form and range of variation the 

 Barrington Island shells agree perfectly with those from Chatham 

 and Charles Island (eschariferus), but the latter are always a little 

 more slender if the specimens I have seen can be taken as a criterion. 

 Twenty -four of them averaged 16 mm. long by 5 mm. in diameter 

 above the aperture, while the diameter of the most slender of forty- 

 two Barrington Island specimens was 6 mm. The latter have the 

 spire less attenuated and slightly more compact. On the whole, it is 

 doubtful if this form can rank higher than as a local race of eschari- 

 ferus. 



Jaws light horn-colored, low, wide, thin, slightly arcuate, of equal 

 height throughout, with blunt ends ; anterior surface with about 16 

 irregularly wide flat ribs, their outer edges reinforced, their ends 

 bluntly denticulating the upper and lower edges of the jaw. 



Radula long and narrow; formula 13-f9.9j-|-13; rhachidian tooth 



X 2 2 X 

 tricuspid, the lateral cusps shorter ; lateral teeth bicuspid ; margin- 

 als with one longer inner bifid cutting point and the outer short, 

 wide cusp broken up into three or four denticles, 



Bulimulus (Naesiotus) galapaganus Pfeiffer. 



Bulimulus galapaganus Pfr., P. Z. S., 1854, p. 58. Mon. Hel. viv. IV, p. 

 503, 1859. 



Bulimttlus {Ncrsiotus) galapaganus Pfr., Mai. Blatt. II, Vers., p. 160, 1854. 



Btdimuhis [Nesiotes) galapaganus Martens, in Albers Heliceen, ed. ii, p. 

 221, 1860. 



Bulimulus [Ncrsiotus) galapaganus Pfr., Nom. Hel. viv., p. 1881 ; Keibisch, 

 Isis, 1892, p. 8; Stearns, Proc. U. S. Nat. Mus., XVI, p. 427, 1.-93. 



Charles Island, at about 200 ft. elevation, near the northeast end 

 of the island. Dr. Baur. 



This is very closely related to B. ustulatus Sby., is slightly longer 

 and more pupiform, and wants the bright yellowish bands. The 

 whorls are more rounded in B. galapaganus than in B. per- 

 spectivus, and the latter is darker and more uniformly colored. 



Bulimulus (Naesiotus) perspectivus Pfeiffer. 



Bulimiis perspectivus Pfr., P. Z. S., 1846, p. 33 ; Mon. Hel. viv., ii, p. 97, 

 1848 ; Keeve, Conch. Icon , Bulimus, pi. 63, fig. 485. 



Bulimulus {^Ataxus) perspectivus Pfr., Clessia, Nomencl. Hel. viv., p. 253, 

 1881. 



Bulimulus {Ncesiotus) rugulosus Reibisch, Isis., 1892, p. 7, t. i, figs. 11 a-b. 



Chatham Island, Galapagos, 300-600 ft.. Wolf, fide Reibisch, on 

 rocks and under stones. 



