56 



ge:oi.ogy of IvA saivIvE county. 



Osag-ensis, R. Wortheni, Mekella striate costata, 

 h'mgulcL mytiloides, Solenomya soleiiformis, S. radiata, 

 Aviculopecten coxanus, A, negdectus, Aviculopecteu 

 interlineatus, A. retil^rarius, Nucula ventricosus, N. 

 parva, Cardiomorpha Missouriensis, Cardiana frag-ilis, 

 Myalina Swallowi, M. recurvirostris, Edmondia per- 

 oblong-a, Cymatodus oblong-us, Lima retifer, Pinna 

 peracuta, Gasteropod (resemble snails in structure), 

 Naticopsis Shumardi, N. Altonenses, N. nodosa, N. 

 subovtus, Enomphalus subquadratus, E. pernodosus, 

 10. subrugfosus, Bellerophon carbonaria, B. Blaneya- 

 nus, Pleurotomara Grayvillensis, P. Shumardi, Mur- 

 chosonia archimedea, Msroclieilus? Ccphalopods 

 (shells chambered, animal living- in outer and larg*er 

 one; chambers connected by a tube or sipliuncle), Goni- 

 atites Hatha\va3^anus, Nautilus LaSallensis, Ortho- 

 ceros Vermillionensis, Orthoceros Rushensis, Tveaia 

 tricarinata. Vertebrates (remains of sharks, usually 

 teeth, spines and fins in a layer in the hig-hest bed of 

 La Salle limestone in cut of Illinois Central Railroad 

 half mile north of zinc works), Cladodus mortifer, 

 Petalodus destructor Petalodus occidentalis, Ag-assizo- 

 variabilis, Scitutus, Laphodus variabilis, Peltodus 

 ung-uiformis. 



VEGETABLE REMAINS 



Calciferous. — Algfaeor sea weeds, plants g-row- 

 ing- in water salt, brackish or fresh, usually attached 

 to rocks or the bottom, destitute of flowers, leaves 

 and stems of various colors. 



Trenton Alg^. — Buthotrephis has been al- 

 ready mentioned. They are not the only ones to be 

 found there. 



CoAiv Measures. — Pecapteris villosa, Pecopteris 

 unita, Neuropteris hirsuta, Neuropteris tennifolia. 



