438 PROCEEDINGS OF THE ACADEMY OF [1896. 



Bnlimulus (Nsesiotus) Tanneri Ball. Plate XVI, fig. 5. 



Bidimulus {NcFsiotus') Fanneri Dall, Nautilus, VIII, p. 127, March, 1895 

 i(err. typ. pro Tanneri, corrected in the index, p. iii, April, 1895). 



Shell short, stout, pointed, with two nepionic and four subsequent 

 whorls ; nucleus rather coarsely transversely ribbed, the interspaces 

 somewhat wider; the subsequent whorls marked by incremental 

 lines and obsolete traces of fine, partly granulose, inconstant spiral 

 threads, only perceptible under a lens ; color pinkish or brownish- 

 white with no traces of a peripheral paler band ; whorls somewhat 

 inflated, suture conspicuous, umbilicus large and deeply pervious ; 

 aperture large with a widely expanded lip, the outer lip much bent 

 over at the body, closely approaching the pillar and united to it by 

 a distinct callus ; length 11 ; max. diameter 10 mm. 



Indefatigable Island, U. S. Fish Commission. 



This is about the size of B. cinereus Reib., but is more conical, in- 

 flated and stouter, with a very diff'erently shaped aperture, the lip 

 teing more expanded and reflected than in any other species yet 

 ■described from these islands. It is named in honor of Capt. Z. L. 

 Tanner, U. S. N., commanding the U. S. S. Albatross during the 

 Oalapagos explorations. None of the specimens were living, 

 lulimulus (Naesiotus) dunoanus Dall. Plate XVI, fig. 7. 



Bulimulus {Ncesiotus) duncanus Dall, Nautilus, VII, p. 52, September, 1893. 



The shell is short, stout, inflated, thin, with two nepionic and four- 

 and-a-half subsequent whorls. The apex is rather pointed, the 

 axial dimple small, the whorls rapidly enlarging, with the suture 

 behind the last whorl deeper than the rest and more oblique to the 

 axis ; the aperture is relatively small and rather oblique, the lip 

 simple, sharp, not reflected, connected across the body with a thin 

 callus, a single tubercle on the body, well within the aperture, and 

 about equidistant from either lip ; umbilicus perforate, narrow ; 

 height of the shell 18, of the last whorl 125 ; diameter of shell 11 



mm. 



Dead specimens only were found on Duncan Island, by Dr. 

 Baur. 



The sculpture comprises only incremental lines and faint wrinkles 

 in harmony with them, especially just in front of the suture and 

 near the end of the last whorl. When perfectly fresh, there were 

 probably microscopic granules spirally arranged and sparsely dis- 

 tributed, but these are now represented only by minute spots of 

 erosion. Except the largest specimens of B. mix, these shells are 



