4?2 
THE CRETACEOUS ROCKS OF BRITAIN. 
List of Fosssls from the Middle Chalk — Continued. 
Zone of 
R. 
Cuvieri. 
Zone of Ter. gracilis. 
Lower. 
Upper. 
Brachiopoda. 
Rbynchonella Cuvieri, d'Orb. - 
X 
X 
X 
,, mantelliana, Sow. 
X 
- 
— 
„ plicatilis, Sow. 
— 
X 
X 
,, reedensis, Eth. - 
2a 
— 
X 
Tere bratula semiglobosa, Sow. - 
X 
X 
X 
Terebratulina gracilis, var. lata, Etk. 
X 
X 
| £ 
„ striata, Wahl. 
X 
X 
- 
Annelida. 
Serpula antiquata ? Sow. 
X 
— 
— 
Echinodermata. 
Cidaris dissimilis, F rbes - 
X 
X 
— 
„ hirudo, Sorig. - 
X 
— 
- 
„ sceptrifera ? Mant. [or serrifera] 
- 
- 
X 
Cyphosoma radiatum, Sorig. - 
- 
— 
X 
Discoidea Dixoni, Forbes - 
- 
X 
— 
Galerites castanea, Brongn. - 
X 
— 
— 
„ subrotundus, Mant. 
X 
X 
— 
Holaster planus, Mant. - 
- 
— 
X 
Micraster Leskei, Desm. - 
- 
— 
X 
„ precursor, Rowe 
— 
- 
X 
Actinozoa. 
Parasinilia centralis, Mant. 
- 
X 
Spongida. 
Ventriculites inipressus, T . Smith - 
„ mammillaris, r l\ Smith 
— 
— 
X 
X 
