142 THE CANADIAN NATURALIST. [Vol. 



X. 



Organic Remains. — One or two fr;i<»;ments of obscure sea- 

 weeds have been noticed by Col. Grant in the shales, otherwise 

 they appear to be devoid of organisms. 



The " Ghjy Band," however, contains a few poorly preserved 

 casts of shells, besides several species of sea-weeds. The fossils 

 are usually found crowded together on some portions of the sur- 

 face of the sandstones, overlaid by more or less earthy partings, 

 particularly at the junction with the overlying Clinton, or those 

 beds that might perhaps be considered beds of passage. 



The sea-weeds are the most common. Arthrophycus harlani 

 is abundant at Grimsby. The branches of this organism is 

 sometimes connected with lobed nodules, having the appearance 

 of fruit pods; however, some palaeontologists consider J.r^Aro- 

 phycus as worm tracks, and, if this be the case, these lobed ex- 

 pansions are simply worm burrows at the end of the tracks. 



A considerable number of undoubted worm tracks or Ichnites 

 is also found. All tlie fossils consist of nothing more than casts 

 in the sandstone. 



The followin"; meajire list of fossils has been obtained. 



CATALOGUE OF MEDINA FOSSILS. 



Genera and species. Reference. 



Arthrophycus harlani Hall, 1852, Pal. N. Y., Vol. II. 



Locality — Grimsby, Ont. 



" " Fruit (?) 



Locality — Grimsby. 



Palseophycus sp 



Locality — Hamilton and Grimsby. 



Zaphrentis bilateralis Hall, 1852, Pal. N. Y., Vol. II 



Locality — Hamilton and Grimsby. 



Atrypa ohlata ... Hall, 1852, Pal. N. Y., Vol. II. 



Locality — Hamilton and Grimsby. 



Modiolopsis orthonota Conrad, 1839, Ann. Rep. N. Y. 



Locality — Hamilton. 



" sp 



Locality — Dundas, Hamilton, and Grimsby. 



Miirchisonia subulata Conrad, 1842, Jour Acad. Nat. So. 



Locality — Hamilton. 



" conoidea Hall, 1852, Pal. N. Y., Vol. II. 



Locality — Hamilton and Grimsby. 



Pleurotomaria litorea Hall, 1852, Pal. N. Y., Vol. II. , 



Locality — Hamilton and Grimsby. 



" pervetusta Conrad, 1838, Ann. Rep. N. Y. 



Locailty — Hamilton and Grimsby. 



Lchmtes (several speeies) 



Locality — Hamilton and Grimsby. 



