of the Diluvium in Norfolk. 313 



nearly complete impression on flint, of a perfect remain of this 

 asterias. 



Asterias regularis (pentagonaster regularls of Linck). Vide 

 Parkinson's Org. Rem. vol. iii, tab. I. fig. 3, My specimen is 

 an impression on flint ; two margins only are preserved. 



Crinoidea. 



Impressions of the articulating surface of the vertebrae of 

 pentacrinites hasaltlformis of Miller, are frequently met with 

 on flints, from the light lands and gravel beds. 



A nodule of decomposing mountain limestone, almost en- 

 tirely composed of fragments of vertebral columns of poterio- 

 crinites crassus of Miller, was found in Roydon pit, near 

 Diss. 



ZOOPHITES. 



Ventriculites of Mantel ; Mantellia of Parkinson. Flints 

 derived from the disrupted chalk strata, exhibit this zoophite 

 in every degree of contraction and expansion ; and also its 

 tubular structure, and membranous or spongoid laminse. They 

 are usually found pyriform, or having the form of a mushroom. 

 The species most frequently met with is radiatus. ManteFs 

 Fossils of the South Downs, tab. X. 



Syphonia of Parkinson. Oviform spongoid remains in flint, 

 having longitudinal tubes filled with the matrix, are frequently 

 found on the light lands. 



Choanites Konigi. Mantel's Fossils, &c., tab. XVI. fig. 19, 

 Is occasionally found in the beds of gravel, and light lands. 



Spongoid remains are very numerous, preserved in a matrix 

 of flint. They occur in a variety of forms, as spheroidal, ovoid 

 cylindrical, branched, palmated, and reniform, with and with- 

 out pedicles ^ among them are found spongus lahyrinthicus 

 and ToivnsendL Mantel's Fossils, &c., tab. XV. figs. 7 and 9. 



Madreporite allied to Madrepora annularis, of Solander and 

 Ellis. 



Madreporite allied to Madrepora galaxea, Sol. and EI. 



Madreporite allied to Madrepora ramea, Sol. and EI. (the 

 caryophillia ramea of Lamark). 



Madreporite allied to Madrepora siderea, Sol. and EI. 



