14 SPIRAXIS. 



Key to Sections of Spiraxis. 



I. Columellar fold or lamella very strongly projecting into 

 the aperture ; outer lip more or less toothed within. 

 a. Having an internal parietal lamella. 



Section Spiraxis, species no. 1, 2. 



a 1 . No parietal lamella. Section Euspiraxis, sp. 3, 4. 

 II. Columellar fold long and but weakly projecting into the 

 aperture. 



a. Oolumella straight, subtruncate at base, with an 

 oblique fold superposed above. 



Section Biangulaxis, sp. no. 48. 

 a 1 . Columella simple. 



&. Outer lip with a prominent internal tooth. 



Section Ravenia, sp. no. 5. 

 6 1 . Outer lip thin and simple. 



c. Shell turrite, with short whorls; and no 

 color-streaks or varix-lines. 



Section Volutaxis, sp. no. 6 to 33. 

 c 1 . Shell oblong-turrite usually with longer 

 whorls, very glossy, marked with grooves 

 and a few inconspicuous varix-lines gener- 

 ally preceded by 'colored streaks; never 

 rib-striate. 



Section Sigmataxis, sp. no. 34 to 46. 

 c 2 . Shell oblong-turrite, rib-striate, with col- 

 ored streaks. 



Section Glandinella, sp. no. 47. 



Section Spiraxis Adams, s. sir. 



The turrite shell is composed of 7 to 9 whorls, the first 

 smooth, some early ones finely costulate, contracted, the last 

 4 or 5 sculptured with spaced ribs with stria in the intervals. 

 Aperture 8-shaped, contracted in the middle by a tooth in the 

 outer lip and a very strong projecting spiral columellar la- 

 mella, penetrating more than one whorl. There is a long 

 parietal lamella within the last whorl, not visible at the 

 mouth. Type S. inusitatus. 



These shells remind one of Pineria and Geoscala in the 



