122 BOOK OF SPECIES. 
angulated, white, with the extremities tinted with 
pink, and marked with a round wart encircled 
by a hollow; lip toothed. 1. W. 18. 10. 
O. GipBosa. Ovate-oblong, obtuse on both 
sides, girded with an elevated obtuse angle; white, 
with rather an orange tint; lip smooth, but ob- 
soletely toothed. 1. W. 18. 11. 
CYPREA. 
Shell oval or oval-oblong, convex, margins turned 
inwards ; aperture longitudinal, narrow ; both 
lips toothed; effuse at both extremities; spire 
very small, scarcely apparent. 
C. EXANTHEMA. Oblong, ferruginous, with 
large whitish round spots, which as they near 
the base become ocellated; dorsal line pale; vio- 
let within; teeth brown, from two to five; spire 
evident. W. 16. I. 
C. arcus. Oblong, sub-cylindrical, fawn- 
colour, with brown rings above, and four large 
dark spots at the base; teeth brown; three; spire 
as last. W. 16. 5. 
C. TESTUDINARIA. Oblong, sub-cylindrical, 
depressed at the extremities, and marked like tor- 
toise-shell, the dark parts of which, when perfect, 
are freckled with white; aperture white; four; 
spire as last. W. 16. 6. 
C. MAURITIANA. Ovate, gibbous, intense 
