xiv F\ REPORT OF PROGRESS. E. W. CLAYPOLE. 



Ortlionota carinata, Orihonota undulata, Orthonota sill- 

 quoidea, Modiomo?p7iaco/icenlrica, Modiomorpha alia, Mo- 

 diomorpha complanata,Nucula belli sir lata, Nucula lirata, 

 Palceonello feennda, Palceonello ftlosa, Palceoneilo emar- 

 g inula, Palceonello muta, Palceonello maxima, Goniophora 

 hamiUonensis, Goniophora truncata, Macrodon hamll- 

 tonlce, Cypricardlnia Indenta, Actlnoptera decussata, Nu- 

 culana dtversa, Amculopecten orbiculatus, Paracyclas 

 I irata, Actlnodesma subrectum ; Pleurotomarla trilix, 

 Pleurotomarla sulcomarginata, Pleurotomarla capillar la, 

 Belter ophon thalia, Belter ophon patulus, Better ophon 

 crenistriatus, Better ophon leda, Cyrtolltes pileolus, Platy- 

 ceras carlnatum ; Coleolus acicula, Coleolus tenuicinctus, 

 Ten taculltes gracilistrlatus, Styliola flssurella, Conular la 

 contlneiis ; Tceniopora exigua, Aulopora tubiformis ; Bat- 

 man ties call I teles, Phacops rana, Proetus macrocephalus, 

 Homalonotus dekayl, Beyrtchia punctulifera. The char- 

 acteristic forms of the subdivisions of the group wili be 

 separated in Part II of this report. 



The Genessee division of No. VIII, supposed to be rep- 

 resented by 200 feet of shales overlying the Hamilton is 

 destitute of fossils. 



The Portage division of No. VIII may be represented by 

 a succeeding mass of black shale containing Card-tola spe- 

 closa, &c. 



The Chemung division of No. VIII lias afforded Pro- 

 duclella hlrsuta, Cyrtina hamiltonensis, Strophodonta 

 perplana, Orthis impressa, Atrypa reticularis. Spirifera 

 mesocostalis, Spirifera mesostrialis, Lelorhynchus mcso- 

 coslale, Chonetes logani ; Palceonello filosa, Palceonello 

 constrlcta, Modiomorpha concentrica, Modiomorpha sub- 

 alata, Eodon bell I str talus, Grammy sia elliptica ; but the 

 Chemung proper has not proved rich in fossils in Perry 

 county, and their fragmentary condition adds to the tedious- 

 ness of collecting a complete suite. The areas are very 

 Large, especially in the northern townships, where the form- 

 ation is at least twice as thick as it is in the southern, and 

 where good exposures are not numerous and the country 

 is wooded. In the southern townships exposures are redu- 



