157 



Placunopsis inoequalis, Phillips 

 Pecten vagans fvar. subfihrosus,) Sowerby 

 Myoconcha texta, Buvignier 

 Modiola Lycetti, Wliiteaves 



inclusa, Phillips 



Area quadrisulcata, Sowerby 



cemula, Phillips 



Guculloea pectinata, Phillips 

 Astarte rhromboidalis, Phillips 

 Sowerbia triangularis, Phillips 

 Gastrochcena Moreana, Buvignier." 



Since sending the foregoing pages to press, I have had the 

 pleasure of visiting the Coral reefs in the Coralline Oolite, 

 near- Scarborough, in company with my esteemed Mend, J. 

 Leckenbt, Esq., and Mr. Petee Cullen. One quarry, near 

 Ayton, which may be considered as a type of the others, 

 consisted of masses of Crystalline Coralline Limestone, the 

 beds having an irregular undulating appearance. The Corals 

 appear to have grown in areas of depression of the CoraUine 

 sea; the rock consists of large masses of highly Crystalline 

 Limestone, forming nodulated eminences, and concave curves, 

 in beds of from 12 to 18 inches in thickness, having a stratum 

 of yellowish Clay filling up the hollows, and forming a 

 horizontal Hue again to the stratification; then follows another 

 stratum of Crystalline Limestone, which assumes the same 

 nodulated condition as the one below it; the surface of the 

 Coral masses, where exposed, shewing that the whole is almost 

 entirely composed of a small celled Astrcea, Thamnastrcea 

 concinna, Goldf., Micraston, Phillips, in some altered condition; 

 the reef is exposed to about ten feet in section, and rests on 

 another, forming the floor of the quarry, and which descends 

 many feet deeper ; the Corals are bored by Gastrochcence, and 

 numerous shells were seen embedded in the Coral mass, 

 which had nestled in the crannies of the reef. Phasianella 

 striata, Sow., Pecten veraineus, Sow., Pecten lens, Sow., Turbo 

 mwrieata. Sow., were the most conspicuous, besides ntmierous 



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