228 
—Turt. D. p. 117.—With five smooth whorls, parti- 
tions slightly depressed externally, clear white, pearly 
within. Diameter of the coil, ¢. Aberdeen, Kerry, 
Belfast, Clare 
Grenus.—SPIROLINA. 
Multilocular ; the last whorl or two spiral and discoid; 
volutions contiguous, the last one terminating in a 
straight line: septa straight, perforated by a 
tube. 
S. SuparcuaTuta F. p. 277.—Navtitus 8. Mont. 
Sup. p. 80. t. 19. f. 1.—Walk. f. 73.—Turt. D. p. 
121.—White, glossy, semi-transparent, with 12 joints 
the first four or five nearly straight and separated by 
oblique raised and more opaque lines ; the rest curling 
spirally inwards and divided by radiating lines; the 
back margin furnished witha raised edge and slightly 
indented by the division of the joints, the front margin 
obtusely rounded ; aperture oblique with a small syphon 
at 
at the upper point. 3 In fine sand. 
S.Seminitua. F. p. 227.—Navtitus. S. Lin. 
1163.—Mont. p. 196.—D. p. 346.—Turt. D. p. 121. 
—Lin. T. 8. p. 118.—Mart. f. 186. Opaque brown, 
elongated, subarcuated, chambers diminishing in size to 
the mouth, which is contracted, outer margin rounded, 
