342 THE MEDALS OF CREATION. : Cuae Sm 
Tunicata ; and not as a single aggregated organism, made 
up of an assemblage of similar parts indefinitely repeated. 
In a paleontological point of view, it matters not which | 
opinion is adopted.* . 
CLASSIFICATION. OF THE ForAMINIFERA.—The number of f 
genera is so great, that I can only attempt to convey a very ¢ 
general idea of the principles of classification adopted by — 
M. D’Orbigny, and give a few illustrations of some of the 
most abundant fal. species. 
That the reader may be cognizant of the usual aspect of 
these shells, five specimens from the Chalk, belonging to as — 
. 
yr 
Lien. 109. FoRAMINIFERA. 
Chalk. Charing. 
Fig. 1.—GLoBIGERINA CRETACEA; the original is 3; of an inch in diameter. 
2.—TEXTULARIA GLOBULOSA; 7 
3.—VERNEUILINA TRICARINATA ; 
4,—CRISTELLARIA ROTULATA; qo. 
5.—RosaLInA LORNEIANA; zo- 
many genera, are here represented (Zign. 109) ; the deposit — 
whence they were obtained will be described hereafter. 
. 
Sb a sa aint a AiO RNAT Sel ts 
* See a masterly paper on the structure of Nummulina and Orbi- 
toides, by Dr. Carpenter; Geol. Journal, vol. vi. pp. 21—89, with ad-_ 
mirable representations of the structural details. 
’ 
