35 Ithaca Group 25 



The lower layers of the sondstone contain an abundance of 

 fossils. The most abundant species are Rhyjichonella exhnia, 

 Leiorhynchus mesacostalis , Modiomorpha stibalata v2iX .chemungensis. 



The following is a list of the less abundant, associated species: 

 Orthoceras bebryx var. cayuga, O. leander, StiH^opora meeki, ASIin- 

 opteria perstrialis, Callonema sp. , Leptodesnia sp. , Discina grandis, 

 Goniophora hamiltone?isis, Nucula diffidens, Plumidina plumaria, 

 Conularia congregata, Schizodus chemtingensis, Microdon bellistria- 

 tus, ProduHella speciosa, Aniboccelia urnbonata? , Spirife?' mesastri- 

 alis, Leptodesnia matherif , Grammysia subarcuata, G. bisulcata, 

 Chonetes scihila, Gomphoceras tuniidum, Leiopteria sp?, Tentaculi- 

 tes spiadiis, Modiomorpha ?nytiloides, Strophodonta perpla^ia. 



Station ^. — Quarry at the south end of Cayuga street. 



The sandstone here is inclined to be shelly and thin bedded. 

 Fossils are not very abundant. The following species were col- 

 ledted: Rhy^ichonella eximia c, Chonetes setigera, C. scitula, Lin- 

 gula complanata, Microdon bellist7-iat2cs , G7''a7n7nysia stibarciiata? , 

 Modiomorpha subalata var. chemungensis c, Orthoceras bebiyx var. 

 cayuga^ Pletirotoma^^ia capillaria, Plumidina plumaria. 



The occurrence of Lingida complanata, of which a single speci- 

 men was found at this station in the midst of the Ithaca fauna, 

 is worthy of special note. This is the most abundant and char- 

 acfberistic species of the Ithaca shale, but is seldom found in the 

 typical Ithaca fauna. 



Station 5. — Quarry southwest of Quarry Street bridge, 140 

 feet above Station i . 



The following species occur here, the first four being very 

 abundant in some layers: Rhynchonella eximia, Spirifer mesacos- 

 talis, S. viesastrialis, StiElopora meeki, Glossites depressus? , Leio- 

 ^'hynchus inesacostalis, Platyceras sp?, Orthoceras bebryx var. cayuga^ 

 Cryptonella eudora r, Microdon bellistriatus, Modiomorpha subalata 

 var. che}nnngensis, Pterinopeflen ereflns, Discina grandis. 



Station 6. — Inclined plane above the railroad, 170 feet above 

 Station i . 



The species constituting the bulk of the fauna at this locality 

 are Spirifer mesastrialis , S. mesacostalis, Stiflopora nieeki. 



Species less common are Pales oneilo Jilosa, Cyrtijia hamiltonensis. 



Station 7. — Quarr}- at the south end of Hazen street, 230 feet 

 above Station i. 



The following is the list of species obtained at this quarry: 



