Vol. II, Pt. I] DALL— GALAPAGOS PULMONATA 377 



transversely striated ; whorls rounded with a deep suture ; 

 sculpture of rather irregular feeble axial wrinkles, stronger 

 on the last whorl ; base rounded, with a minute umbilical per- 

 foration ; aperture with a thin sharp, not reflected margin ; 

 pillar short, reflected over the umbilical perforation : there 

 are a few obscure spirals on the upper whorls, but no dis- 

 tinct or regular spiral striation. Length of shell 12.0 ; of 

 last whorl 8.0 ; of aperture 5.5 ; diameter 6.0 mm. 



Narborough Island, in the grassy area at the rim of the 

 crater, 2000 to 4500 feet elevation; Ochsner. 



4. Bulimulus (Naesiotus) cucullinus, new species 



Shell wnth a dimpled apex of livid slate-color, two strongly 

 transversely striated nuclear whorls and about four subse- 

 quent moderately convex whorls separated by a distinct but 

 not deep suture ; color of the shell grayish white, covered 

 by an olivaceous brown periostracum, smooth but not lus- 

 trous; sculpture only of inconspicuous incremental axial 

 lines, more or less irregularly disposed; base produced, with 

 a very narrow umbilical perforation largely covered by the 

 reflected inner lip; aperture subovate, the margin callous, 

 expanded and almost reflected ; the pillar and outer lips 

 united across the body by a thin layer of vitreous enamel, the 

 rest of the margin of the aperture conspicuously white, the 

 throat livid. Length of shell 19 ; of last whorl 12 ; of 

 aperture 9 ; diameter 9.5 mm. 



Found by Mr. Ochsner on Hood Island hibernating under 

 stones between 200 and 600 feet elevation; a variety with 

 faint indications of a peripheral band, with the others and 

 also on Charles Island in the moist area under moss and 

 grass at 1650 feet; and on Barrington Island under stones 

 in hibernation at 200 feet; lastly a paler variety on Hood 

 Island at 380 feet elevation. 



5. Bulimulus (Naesiotus) albemarlensis, new species 



Shell of the general aspect of fortiigamis but larger; solid, 

 stout, inflated, short-spired, with six rapidly increasing 

 whorls; apex dimpled, nuclear whorls small, transversely 



