REPORT OF THE STATE PALEONTOLOGIST 1902 1061 



are five or more plications on each side. An average individual 

 measures 11 by 15 mm and has about six or seven plications on 

 each side of the median sinus. A larger individual measures 18 

 by 26 mm and shows the characteristic high area and sloping 

 cardinal sides of this species. It has about 10 plications on each 

 side of the sinus. This is the most characteristic species of this 

 limestone, but most of the individuals are small, with immature 

 characters. 



5 Spirifer perlamellosus Hall. Several speci- 

 mens showing characteristic form and plications but only occa- 

 sionally showing the concentric lamellae. 



6 S. cyclopterus Hall. A few specimens showing form 

 and character of plications of this species. 



7 Rhynchospira formosa Hall. 2 well marked 

 individuals. 



8 Uncinulus campbellanus (Hall). A common 

 species in this limestone. 



9 U. nobilis Hall. A number of more rounded and more 

 coarsely plicate individuals from these beds are referred to 

 this species. They do not have the characteristic lateral depres- 

 sion of the cardinal margins. 



10 Atrypa reticularis (Linne) . A robust variety 

 is common. 



11 Meristella princeps Hall. A single specimen. 



12 M. a r c u a t a Hall. Several internal molds and a shell 

 with the characters of this species. 



13 Eatonia medialis Vanuxem. A single valve re- 

 ferred doubtfully to this species. 



14 Treinatospira perforata Hall. A single char- 

 acteristic specimen of this species was obtained from the 

 weathered portion of this limestone. 



15 Gypidula pseudogaleata Hall. Abundant. 



16 Rensselaeria mutabilis Hall. A single speci- 

 men. 



17 Platyceras cf. gibbosum Hall. This specimen 

 may have come from the New Scotland layers. 



18 Aspidocrinus scut e 1 1 i for mis Hall. Abun- 

 dant in the lower layers of the limestone. 



