352 PROF. EHRENBERG ON. ANIMALS OF THE CHALK 
occurring recent and beneath the tertiary formation; but almost — 
all of which have been again called in question. 
a. POLYTHALAMIA. 
— 
. 
Spirolina cylindracea, Lam., from Paris, according to Soyer Wil- 
lemet in Bronn’s ‘ Lethza.’ 
6. CORALLINES. 
2. Oculina virginea, from the chalk of Riigen, according to Gold- 
fuss and Von Hagenow, 1839. 
c. ECHINOIDEA. 
3. Clypeaster oviformis, Lam., from Dax, according to Grateloup, 
1836*. 
4. Spatangus acuminatus, Lam., ibid. 
5 canaliferus, Lam., ibid. 
6. ——_—— gibbus, Lam., ibid. 
7 
8 
. ——_—— ovatus, Lam., ibid. 
. ——_——._ punctatus, Lam., ibid. 
d. Mouuusca. 
9. Cyclas cornea, from the Weald clay, according to De la Beche, 
1831+. 
10. Terebratula vitrea, according to Leopold v. Buch, 1834. 
i. — Caput serpentis? (= striatula), according to Leo- 
pold v. Buch, 1834. 
To al. sp., Leopold v. Buch, 1834. 
13. Paludina vivipara, from the Weald clay, according to Fitton, 
1824. 
14. T’rochus, according to Defrance, 1824. 
To these species, only few of which are as it seers suited for 
safe comparisons, are to be added the following fifty-seven mi- 
croscopic bodies, very accurately compared after numerous ob- 
servations, and, from the peculiarity of their form, capable of be- 
ing perfectly distinguished. In order to show at a glance the 
certain relation of the fossil form to the chalk, the white writing 
chalk is denoted by the letters W. Ch., and to each species one 
of the characteristic localities has been added. So also Ch. M. 
is used to denote Chalk Marl. 
* JT have since been able to compare this small work by Dr. Grateloup, which 
however bears a different title to that given by Bronn. It is called Mémoire 
de Geo-xoologie sur les Oursins fossiles (Echinides), par Grateloup. Bordeaux, 
1836. It has merely been revised by Charles des Moulins. ; 
+ In De la Beche’s Geological Manual, London, 18381, p. 296, there is a full 
catalogue of the Weald clay fossils. 
