OF THE COUNTIES OF NORTHUMBERLAND AND DURHAM. 2059 
A few specimens apparently belonging to this species were 
procured from Humbleton Quarry, attached to the inner surface 
of valves of Productus horridus. 
S. ompHatotzs, Goldf. 
Serpula omphatotes, Goldf., Petrif.i., p. 225, tab. 67, f£ 34 
In Magnesian-limestone; rare. Humbleton. 
Two or three specimens of a semiflattened Spirorbis, associated 
with the former species from Humbleton, agree very well with 
Goldfuss’ figure and description of Serp. omphalotes. The at- 
tached surface is very flattened, and the spire has two or more 
gradually increased turns. It is about the tenth of an inch in 
diameter. 
RADIATA. 
Ciass. ECHINODERMATA. 
Orper. EOHINIDA. 
Faminy. CIpaRID&. 
36. CIDARIS, Klein. 
Cidaris, Geol. Russ. i., p. 221. 
In Magnesian-limestone ; rare. Humbleton, Tunstall, Dalton- 
le-Dale. 
Fragments ofan apparently undescribed species of Cidaris are 
occasionally found in the above localities. 
Cuiass. CRINOIDEA. 
37. ENCRINITES, Miller. 
KE, pianus, Willer. 
Cyathocrinites planus, Mill. Hist., Crinoidea, p. 86 ? 
Encrinites planus, Scloth., Petref., tab. 26, f. 6 a—c. ? 
In Magnesian-limestone ; common. Tynemouth Cliff, Hum- 
bleton, Tunstall. 
VOL. I. Mm 
