146 



Mr. Williamson on the Distribution of 



In the lower, or ironshot portion of the rock only, I have met with 



Sanguinolaria undulata. 

 CucuUea carinata (nobis). 



Pinna cuneata. 

 Terebratula digona. 



Hitherto, I believe, no remains of Saurians have been found in the cornbrash 

 of Yorkshire ; and of Crustacea (excepting those in the clay) , portions only of two 

 claws and one body, the latter probably the A. rostratus. 



The following fossils I have not seen from any other stratum, and they are 

 apparently characteristic of it, at least on the Yorkshire coast : 



Plagiostoma rigidulum. 

 CucuUea, new species. 

 Terebratula digona. 

 Melania vittata. 



Terebra granulata. 

 Ammonites Herveyi. 

 terebratus. 



The following species are found also in the Bath oolite 



Cidaris vagans. 

 Pholadomya ovalis. 



Murchisoni. 



Mya literatu. 

 Amphidesma decurtatum. 

 securiforme. 



Trigonia costata. 

 Unio peregrinus. 

 Plagiostoma interstinctum. 

 Pinna cuneata. 

 Ostrea Marshii. 

 Trochus granulatus. 



Trigonia clavellata. 



The following are also obtained in the coralline oolite : 



Pholadomya ovalis. 

 Mya literata. 

 Trigonia clavellata. 

 Modiola cuneata. 

 Lima rudis. 



Pecten inaquicostatus. 



lens. 



Ostrea Marshii. 

 Terebratula obsoleta. 

 Astacus rostratus ? 



Kelloways Rock. 



This is best exposed at Gristhorpe, Cayton Bay, and Scarborough Castle Cliff. 

 At the latter place it presents the following ascending section : 



(a.) Soft variable beds, yellow at the lower, and light green towards the 



upper portions; occasionally tinged with peroxide of iron 25 feet. 



(h.) Hard ironstone 5 — 



The ironstone (&.) is full of fossils, but owing to its hardness they are extracted 

 with difficulty. They chiefly consist of 



Lucina lirata. 

 Gryphaea dilatata, var. /3. 

 Ostrea Marshii. 

 Belemnites abbreviatus. 



tornatilis. 



Ammonites Calloviensis. 



Ammonites Calloviensis, var. Gulielmi. 



sublaevis. 



Kcenigi. 



Sutherlandeee. 



flexicostatus. 



