MARL-SLATE AND LOWER MAGNESIAN LIMESTONE. 193 



its upper portion passes by modification into an even light grey, 

 sub-saccharine limestone, and into a vesicular, smoke grey lime- 

 stone. In these limestones, or in the three phases of the one, 

 I have found fossils, most of which are better preserved than 

 those in the soft limestone or marl (No. 5) noticed in my for- 

 mer paper, and several of which do not occur in that bed. The 

 Chonetes is particularly abundant in a testiferous state. Producta 

 horrida also occurs very plentifully in the vesicular limestone. 



LIST OF SPECIES. 



Nautilus Freieslebeni, Geinit%. 



Fragments of individuals from 1^ to 2 inches in diameter. 

 Rare. 



Turbo heliclnus, Schlotheim. 

 Rare. 



Chemnitzia Eoessleri, Geinitz. 

 A single impression. 



Pecten pusillus, Sch. 



Of fair size ; in single valves. Rather rare. 



Astarte Vallisneriana, King. 



Generally imperfect, both as casts and impressions- Hitherto 

 had only occurred at Whitley. 



GeRVILLIA ANTIQUA, MiMster. 



Not rare. 



Gervillia keratophaga, Sch. 

 Rather rare. 



Clidophorus costatus, Brown. 

 Not rare. 



Tellina Dunelmensis ? House. 



A single valve, about iVths of an inch long, strongly resem- 

 bling the species to which it is referred. 



