8 BOOK OF SPECIES. 
somewhat furrowed from the strie of growth; 
dirty yellow; inside brilliant white. W. 38. 84. 
EMARGINULA. 
Conical, shield-shaped ; vertex inclined to one side ; 
internal cavity simple; dorsal margin fissured. 
E. rissurA. Oval, convexly conic, cancel- 
lated by small longitudinal ribs and transverse 
strie, pellucid, whitish; summit curved; margin 
crenulated; small. B. W. 37. 86. 
E. pepressa (Blainville). White, limpet- 
shaped, ovate-oblong, laterally depressed; sum- 
mit salient, pointed, and inclined, from which 
proceed nine principal ribs, and smaller ones 
intervening, which are met at right angles by 
transverse strie, and at their junction appears a 
tubercle ; greenish within ; small. 
E. EMARGINATA. Ovate, conic, patelliform, 
and ribbed, white or greenish white, channelled 
within anteriorly ; margin sub-emarginated ; eight 
of the ribs more prominent than the rest; sum- 
mit pointed and sub-central. %...2. 
