238 
unless at the commencement or apex, where they are 
vertical or radiating ; their surface convex, strongly gro- 
nulated and glistening. Aberdeen 0,04....004. 
GrEnus.—ROTALIA. 
Orlicular, spiral, convex or conoid above, flattened, ra- 
diated, and tuberculated beneath, multilocular ; 
aperture marginal, triangular. 
R. Beccaria. . p, 232.—Macg. Aber. p.35.— 
Navutitus B. Mont. p. 186. ¢. 18. f. 4.—Turt. 
D.p. 119.—Dor. Cat. t.19. f. 28.— Walk. f. 63.—- 
D. p. 342.—Transparent, white or covered with a brown 
skin, convex on one side and flat on the other; spires 
four or five, twisted, with ten joints in the first which 
are deeply grooved ; aperture oboval Reversed var. 
(Naut. Perversus.Walk. f. 64.—Mont. p. 187. ¢. 
18. f. 6.) Minute. Weymouth, Margate, Sc. in 
sand. 
R. InFuata. F. p. 232.—Nautitus 1. Mont. Sup 
p. 81.¢. 18. f.3.—Turt, D. p. 120. Brown, opaque, 
with three volutions; in the first are three joints which 
are exceedingly tumid and rounded, and so deeply divi- 
ded as to appear like lobes; the aperture somewhat 
globular. Minute. In fine sand. 
