EGG.—Shaped generally like the eggs of this Group, higher than broad, about as 15 to 13, the number of ribs 30, conodial truncated, the middle but little narrower than the base, the upper half sloping rapidly, and convex; about one third the ribs reach the summit, the rest end at from one half to two thirds distance from base; the spaces between the ribs excavated roundly, and crossed by many fine ridges; the micropyle in centre of a rosette of fine minute flat cells, outside of which are four irregular rings of excavated cells, generally long and narrow, varying from sub-crescent to five-sided; color greenish-yellow. Duration of this stage 10 to 11 days, in July.