104 



PROCEEDINGS OF THE ACADEMY OF 



[Feb., 



to an irregular costulation. There is an angular gutter behind the 

 basal lip, and the reddish-brown color gives place there to a wide 

 buff stripe which borders the lip. The whole base has a sculpture of 

 extremely minute spiral lines in fresh examples ; and under the micro- 

 scope a veiy minute spiral lineolation is seen between these spiral 

 lines, which are readily visible with a hand lens. The upper surface 

 also snows very faint spiral lines in places, and there is often some 



c 



Fig. 19. — Ashmunellii j. albicauda P. and F. A-C, from Box of White Tail 

 (diam. 13.3 mm.) ; D, Station 14 (diam. 7 mm.) ; E, Station 2 (diam. 12 mm.) ; 

 F, Station 14. 



interruption of the growth striae, giving a slight appearance of puncta- 

 tion. Seven specimens from Station 14 measure: 



Alt 5 5.5 4.S 4.7 5.2 4.8 5 mm. 



Diam 12.5 12.5 12 11.5 11.5 11.3 11.3 " 



Whorls U 5£ 5| 5* 5* o\ 5* 



While variable in size and elevation of the spire, which may be nearly 

 flat or low-conic, and in the shape of the basal teeth, the variations 

 do not seem to differ in the several colonies. 



Terminal ducts of the genitalia are figured on p. 95, fig. 16, and 

 the measurements are given in the table, p. 97. The epiphallus in the 

 individual measured (No. 97,939, Station 4, in White Tail Canyon) is 



