47 Ithaca Group 47 



Plantse. 



Phtmulina plumaria Hall. 



This species occurs abundantly at many localities in the Ithaca 

 group. I have also found it in the upper Spirifer IcEvis fauna 

 at Glenwood. 



Psilophyton princeps Dawson. 



Common in the Ithaca shale and Portage group. 



Rachiopteris punctata Dawson. 



Occurs in the Ithaca shale. — H. S. Williams. 



Lepidodendron sp. 



Fragments of a species of Lepidodendron have been found in 

 the Ithaca group at station 8-4. 



Typicai, Chemung Fauna. 



The Chemung fauna does not occur in any of the Ithaca sec- 

 tions, but the following list represents it at the typical locality, 

 near Chemung village, as determined by Prof. Williams*: — 



Orthis tioga, Streptorhynchus chemiaigensis, AviculopeBen pec- 

 teniformis Hall, Pterbiea cheniungensis (Con.) H. S. W., Stro- 

 phodonta cayuta, S. demissa, Produ£lella lachrymosa var. Ihna, P. 

 costatulg,, Spirifer disjunSlus, Amboccelia umbonata var. gregaria, 

 Atrypa reticularis, Rhynchonella contraSla, Leiorhynch^is sinuatus, 

 L. mesacostalis, Ctyptonella eudora, Pterojiites spinigerus Con., 

 Pterinea protexta Con., Avicula niultilineata Con., Cypricardites 

 {Goniophora') cheniungensis, Schizodus {Nuculites) cheniungensis 

 (Con. ), Grammysia subarcuata H. & Whit. 



The rare species are Chonetes setigera, C. illinoise7isisf , Pleuro- 

 tomaria capillaria, Euoniphalus sp., Collonema sp. , Rhynchonella 

 sappho, Orthis micheli?ii L'Ev. (if distin<5l from O. vanuxemi^, 

 Glyptodesina sp. , Bellerophon mcera, Platyceras sp., Cyclonema sp., 

 Orthis carinata, O. leo7iensis, Knorria sp. , Cladochonus sp., Stro- 

 phodonta perplana var. 7iervosa, Taxocrinus ithacensis, Goniphoce- 

 ras sp., Spirifer fimbriaia, ''Fucoides graphica,'^ Spirifer mesa- 

 costalis (2d var.), Atrypa aspera, Orthis impressa (wide var.), 

 Rhynchonella orbicularis, Discina grandis, Mytilarca cheniungensis. 



*Bull. U. S. Geol. Surv., No. 3. 



