THE NAUTILUS. 53 



ulose surface and six and a half whorls ; apex rather pointed, 

 whorls rapidly enlarging, the suture behind the last whorl deeper 

 thau the rest, aperture relatively small, rather oblique ; the lip sim- 

 ple, not reflected, a single tubercle on the body whorl well within 

 the aperture and about equidistant from either lip ; umbilicus per- 

 forate, narrow. Alt. of shell 18 ; of last whorl 12"5 ; diam. of shell 

 11 mm. 



Duncan Island, Baur ; no living ones seen. 



Bulimulus (Naesiotus) amastroides Ancey var. Anceyi Dall. 



Shell resembling B. amastroides Ancey but with more plicate sur- 

 face, ruder aspect, smaller mouth and more angular periphery. 

 Lon. 9, lat. 4*5 mm. 



Chatham Island, 1600 feet; Baur. 



This may prove merely a depauperate variety of B. amastroides, 

 but at first sight it looks very different. 



Bulimulus jacobi var, vermiculatus Dall. 



Shell with five and a half sharply granulated, wrinkled whorls; 

 suture deep, aperture small, simple, thin-edged ; umbilicus perforate, 

 rather large but not funicular. Lon. 8, lat 5'5, alt. of last whorl 6*0 

 mm. 



James Island at James Bay, Baur. 



Resembles a dwarf B. jacobi with very sharp, beaded, alternate 

 granulations in spiral rows ; transverse wrinkles small but distinct ; 

 the spire pointed but the apex rather blunt. 



Bulimulus olla Dall. (B. jacobi Reeve, Icon,, not of Sby., Conch. Illustr.) 



Duncan, Indefatigable, and Barrington Islands, Dr. Baur. 



This shell is closely related to B. jacobi and was figured by 

 Reeve under the name of jacobi. The original jacobi was sent by 

 Cuming to Dr. Lea and subsequently a specimen of Reeve's form 

 was added by Mr. Cuming. These are now in the Nat. Museum. 



The true jaco6i is smaller, and is sharply spirally sculptured Avith 

 fine lines of beaded granules alternating in size, every fifth or sixth 

 row being larger. It has six inflated whorls and a pale peripheral 

 baud. B. olla has a nearly smooth almost polished surface, only 

 marked with incremental faint lines, seven whorls and a very bul- 

 bous pillar. It is a larger shell than the original jacobi. The lat- 

 ter comes from James, Albemarle, Charles and Chatham Islands, in 

 the wooded zone, while B. olla inhabits the grassy upper zone. 



