110 BULIMULUS-NAESIOTUS. 



" A specimen of this form was sent to Mr. Smith at the British 

 Museum, and by him compared with the type of B. eschariferus with 

 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." (Dall). 



B. PERSPECTIVUS (Pfeiffer). PI. 22, figs. 10, 11, 12 ; pi. 24, figs. 35, 



36. 



Shell with a narrow but very deep and well-like umbilicus, oblong- 

 turrited ; reddish-brown becoming paler on the spire, and sometimes 

 with a narrow, pale peripheral girdle; glossy, with faint arcuate 

 growth-wrinkles. Spire with slightly convex lateral outlines and 

 obtuse apex; whorls 7, the earlier If costulate, all whorls convex, 

 the last rather sack-like and full below, excavated behind the col- 

 umellar lip. Aperture ovate, dark purple-brown inside, somewhat 

 oblique, slightly exceeding one-third the shell's length ; peristome 

 narrowly expanded throughout, and, with the broadly expanded 

 columella, of a brown color. Columella either simply concave or 

 conspicuously obliquely truncate below. 



Alt. 16-5, diam. 6'3 ; length of aperture 6'2 mill. 



Alt. 17, diam. 7 ; length of aperture 6'5 mill. 



Alt. 16, diam. 6'5 ; length of aperture 6'5 mill. (Pfr.). 



Chatham Island, Galapagos, 300-600 ft. alt., on rocks and under 

 stones (Wolf). 



Bulimus perspective PFR., P. Z. S., 1846, p. 33 ; Mon. Hel. Viv, 

 ii, p. 97, 1848. REEVE, Conch. Icon., Bulimus, pi. 63, fig. 435. 

 Bulimulus (Ataxus) perspectivus PFR. CLESSIN, Nomencl. Hel. 

 Viv, p. 253, 1881. Bulimulus (Ncesiotus') rugulosus REIBISCH, Isis, 

 1892, p. 19, t. i, figs. 11 a-b. Bulimulus (Ncesiotus) perspectivus Pfr., 

 BALL, Proc. A. N. S. Phila., 1896, p. 435. 



The species resembles B. eschariferus in form, but it is of a deep 

 reddish, instead of an olivaceous brown, the last whorl is more 

 swollen basally and the umbilicus is larger and penetrates well-like 



