10 Proceedings of the Biological Society of Washington. 



Bulimulus (Naesiotus) trogonius n. sp. 



Shell small, olivaceous, with five and a half whorls separated by a very 

 distinct suture ; pupiform, with a rather blunt dimpled apex, the initial 

 whorl conspicuously transversely striated ; sculpture of minute regular 

 transverse (or axial) wrinkles crossed by microscopic spiral bands where 

 the wrinkles are interrupted or modified ; last whorl subcylindric, much 

 the largest; base attenuated, with a minute umbilical chink; aperture 

 small, simple, sharp-edged, the outer and pillar lips connected by a layer 

 of callus; pillar short, stout, anteriorly subtruncate within the aperture. 

 Height of shell, 7.0; of last whorl, 5.0; of aperture, 2.5; max. diameter 

 of shell, 3.0 mm. 



Albemarle Island, Galapagos group, at an altitude of about 1300 feet 

 above the sea. U. S. S. Albatross. Cat. No. U. S. Nat. Mus. 274,096. 



This is the smallest species of Naesiotus yet recorded. It belongs to the 

 group of B. arnastroides Ancey, and may well represent the stock from 

 which the varied Bulimulus fauna of the islands has been gradually 

 evolved by modification and isolation. 



Paul Reibisch described a species of Pupilla under the name of wolfi 

 which he supposed to be the same as the P. wolfi of Miller, originally from 

 Guayaquil on the mainland. Dr. Pilsbry informs me that the Galapagos 

 species is not the same as the continental wolfi, and therefore I propose 

 for it the specific name reibischi. Reibisch's P. clausa and P. munita 

 seem sufficiently distinct. Reibisch's Bulimulus acutus is not the same 

 as the much earlier B. acutus Leach, and may take the name of rugatinus. 

 His B. terebra is not the same as B. terebra Matheron 1832 (fide Pilsbry), 

 but the latter I have not yet been able to consult, and it may be a Buli- 

 minus. The name venustus Reibisch is preoccupied by Beck in 1838, but 

 Reibisch's name is a synonym of ustulatus Sowerby. Bulimulus vermi- 

 culatus Dall (not of Beck, 1838) is a synonym of B. cinereus Reibisch, 

 but the latter is preoccupied by Reeve in 1848, and the species may take 

 the name of cinerarius. 



Bulimulus (Scutalus?) apurimacensis n. sp. 



Shell of moderate size, dull whitish with axial more flesh colored 

 streaks, the interior of the aperture light yellowish brown ; spire acute, 

 of seven whorls, the nuclear whorls reddish brown, transversely delicately 

 striate, the apex dimpled ; base with a wide funicular umbilical pit, above 

 minutely perforate; whorls moderately convex, suture distinct, not ap- 

 pressed or channelled ; sculpture of the last four whorls of retractively 

 oblique fine axial threads regularly disposed, with about equal inter- 

 spaces, covering the entire shell, but a little less distinct near the aperture ; 

 outer and inner lips approximated, connected over the body with a thin 

 layer of callus, aperture egg-ovate, the lip widely reflected and sharp, the 

 pillar simple; a section shows that above the perforation in the last whorl 

 the hollow of the axis expands, funnel-like, and in the next preceding 

 whorl is anteriorly contracted and posteriorly expanded, and similarly 



