276 JBoRTY-sixTH Report on the State Museum. 



of the specimens appear to have the proportions of small JR. exitniay 

 Hall (see Pal. N. Y., vol. iv, pi. 55, fig. 1). Others are nearer young 

 JR. prollfica, Hall, having about sixteen plications, and are without a 

 marked sinus and fold, a fact noticed by Prof. Hall in young specimens 

 of this species (see Pal. K. Y., vol. iv, p. 343). 



lAorhynchus mulHcosta, Hall. 



Segments of crinoid stems. 



Anibocmlia umhonata, Conrad. 



Palceoneilo emarginatay Conrad. 



Tropidoleptiis carinatus, Conrad. 



In the upper part of the creek are cliffs of 20' and falls, which have 

 been called 502 A*. The shales are arenaceous, some layers quite regu- 

 lar, and micaceous; generally with fossils, but these are for the most part 

 small forms. The following species from this exposure have been 

 identified : 



Rhynchonella congregata, Conrad (?). 



A majority of the specimens appear to be nearer JR. congregata, Con- 

 rad, than any other figured forms. Some small specimens which are 

 probably the young of the above resemble small R. prolifica, Hall. It 

 is extremel}'^ difficult to determine with precision the specific identity 

 of many of the Rhynchonellas in the eastern Hamilton. 



Spirifer medialis, Hall. 



Small specimens of the above species. 



N^ucula beUistrlata^ Conrad. 



A-mhoccelm umhonata^ Conrad. 



Leptodestna Roger si, Hall(?). 



The wing of the specimens does not appear to be as mucronate as in the 

 figured forms of this species. In this respect they agree more closely 

 with th^ short forms of the Chemung, JL. sociale, Hall, particularly with 

 a specimen from Broome county. (See Pal. N. Y., vol. v, pt. I, I, pi. 

 21, fig. 33.) However, JL. Rogersi, Hall, is given as abundant in the 

 Hamilton group, and specimens are mentioned from Norwich, Che- 

 nango county, and Leonardsville, Madison county. (See Pal. N. Y., 

 vol. V, pt. I, I, p. 177.) 



Chonetes seltnla, Hall. 



Produrtella. 



Jjiorhgnrhiis niulticosta. Hall. 



Paracgelas llrata, Conrad. 



Goniatites. 



Tentamilites. 



Goniophora carinata, Conrad. 

 . Tropidoleptus carinatiis, Conrad. 



