Parke R_, on Miliola. 
57 
its sides^ as in Spiroloculina (Plate V, figs. 1 to 7). In 
others the chambers overlap to such an extent^ that the 
later always envelope the older whorls; and only two, the 
last and the penultimate, are visible, as in Biloculina (PL 
V, figs. 29 to 35) . These two forms are symmetrical. Several 
other forms, more or less overlapping in their habit of growth, 
are asymmetrical, and, in consequence, show more chambers 
on one face than on the other ; from three to eight on one, and 
from two to six on the other ; some shells having only two on 
a. h. c 
rig. 5. — Ideal transverse sections of a symmetrical compressed Miliolse— 
Quinqueloculinse. 
one, and three on the other side visible ; but usually they show 
five on one side and three on the other. These are Quinque- 
loculince (PL V, figs. 8 to 21, and woodcut, figs. 5«, b, c). 
Some Miliolse affect a three-sided shell ; the antepenulti- 
a. ^ b. 
rig. 6. — Ideal transverse sections of trifacial Miliolse — Triloculinai. 
mate, as well as the penultimate and the last chamber, being 
externally visible. These are Triloculince (PL V, figs. 22 to 28.) 
The ornamentation of the Miliolse is probably the most 
