FOSSILS OF THE YORKSHIRE COAST. 16? 



avicula inaequivalvis, gryphsea depressa, and terebratula bidens (lineata 

 Young and Bird) are most abundant in the marlstone and ironstone 

 series, whilst nucula ovum, and amphidesma donaciforme, and the am- 

 monites and belemnites generally, belong to the upper or alum shale, 

 and to calcareous nodules connected with it. The smaller of these 

 concretions often enclose single ammonites, and the larger ones which lie 

 nearer the ironstone series, are filled with a variety of fossils. Remains 

 of saurian animals have been found in all parts of the formation, but are 

 most abundant in the upper shale. 



FOSSILS OF THE YORKSHIRE COAST, 



ARRANGED ACCORDING TO THEIR NATURAL AFFINITIES, 

 With Notices of the Strata in which each Species occurs. 



REMAINS OF MONOCOTYLEDONOUS PLANTS. 



Lycopodineae. Lycopodites uncifolius,* and thuites cxpansus, upper and lower sand- 

 stone and shale. 



Equisetaceas. Equisetum, 1, columnare, 2, laterale,* lower sandstone and shale. 

 Filices. Scolopendrium solitarium,* upper and lower sandstone and shale. 



Aspleniopteris Nilsoni, upper sandstone and shale. 

 Sphasnopteris, 1, latifolia,* 2, longifolia,* and 3, digitata,* upper 

 sandstone and shale ; 4, stipata,* upper and lower sandstone and 

 shale ; 5, muscoides,* 6, lanceolata,* 7> undulata,* lower sandstone 

 and shale. 



Neuropteris, 1, lobifolia,* 2, Isevigta,* upper and lower sandstone and 

 shale. 



NOTE. The names of the strata are written in italics after the names of the species. The mark f 

 is prefixed to species accidentally omitted in the former catalogues : distinguishes the species named 

 by the author. 



