CALYPTREA. 13 
smooth ; summit sharp and erect, whitish ; in- 
ternal appendage oblique. W. 37. 4. 
C. equEestTRis. Sub-orbicular, wrinkled, and 
minutely striated longitudinally ; summit lateral 
and obtuse, white; margin sinuated irregularly. 
mew. 37.1 
C. rapians. Orbicular-depressed, trochi- 
form, whitish or yellowish, adorned with sub- 
nodulous, distant, rayed and elevated striz ; be- 
neath concave, whitish, or spotted with brown, 
with a spiral plate; summit sub-central ; epider- 
mis lamellar and brown. Size sometimes very 
laree.  W. 37. 7. 
C. spinosa. Base ovate-roundish, conic, lon- 
gitudinally wrinkled, with super-imposed tubular 
spines, dirty brown; interior rich coffee-brown, 
except the borders of the cup; diameter an inch. 
C. mpricata. Whitish, thick, sub-conic, 
and ovate, imbricated by longitudinal ribs and 
