li 
opaque, white, spiral, outer whorl rising into a ecarina- 
ted ridge on the top, the middle coneave and somewhat 
pervious, inner volutions inconspicuous, base a little 
spreading; aperture round. 0,0625. Salcomb Bay, on 
shells. 
S. CorruGaTta Serputa. C. Mont. p. 502.-—Lin. 
£.8. p. 242.—D. p. 151.—Turt. D. p. 151.—Strong, 
spiral, white, roughened by transverse wrinkles, a small 
portion only of the second volution visible; centre 
umbilicated; aperture orbicular. %. Not rare on 
slate rocks at Milton, stronger than Spirillum and 
never exposing so much of the interior volution. 
S. Mrinura.—Serpora. M. Mont p. 505.—Turt. 
D. p. 150.—Ian. T. 8. p. 241.—D. p. 1072.—Very. 
small, spiral, dirty white, with two or three lateral volu- 
tions, wrinkled transversely, sometimes with a slight 
longitudinal furrow on each side, forming a ridge or 
carina along the back. 0,02. Heteroclite and not 
easily distinguished from IHeterostropha except by its 
size, rounded base and habits. On Corallina Offci- 
nalis. 
S. Lucrpa.—Serpura. L. Mont. p. 507.—Lin. 
T. 8. p. 243.—D. p. 1075.—Turt. Dic.—Serrp. 
REFLEXA. Adams in Lin. Tr. 5. p. 4. t.1. f. 31, 2.— 
Irregular, heterostrophe, pellucid, glossy, white, elways 
more or less spiral, sometimes lateral, with two or three: 
