62 Cincinnati Society of Natural History. 
About ten feet below the crinoidal layer (No. 3), a ‘wavy 
limestone’’ layer makes its appearance. No satisfactory ex- 
planation has yet been given of the mode of formation of 
these undulated limestones, which occur also in the Utica 
and Richmond groups. It is only the upper surface which 
is waved. 
A large and varied fauna has been made known from these 
Trenton beds, but it is the result of many years’ careful 
searching by many collectors. The meagre results of a day’s 
collecting will no doubt prove disappointing to those visiting 
the “low river quarries”’ for the first time. The commonest 
and most characteristic fossil is the bryozoan £ridotrypa 
briareus (Nicholson). Below is given a list of fossils recorded 
as occurring in the Point Pleasant beds.* 
CQALENTERATA. 
Tetradium fibratum Safford. 
ECHINODERMATA. 
Dendrocrinus dyeri (Meek). Lichenocrinus pattersoni Miller. 
e navigiolus Miller. Merocrinus typus Walcott. 
Iocrinus subcrassus Meek and _ Palezaster dubius Miller and Dyer. 
Worthen, variety. 
*The lists given in this paper are by no means exhaustive. After all the pains- 
taking collecting of many years new forms are continually being brought to light. 
Harper and Bassler’s Catalogue of the Fossils occurring in the vicinity of Cincinnati, 
1896, which gives the ranges of fossils, has been used as a basis in assigning the 
fossils to the various subdivisions given in this paper. In revising the lists and 
making corrections where needed, the writer has had the generous help of his 
friends, Messrs. R. S. Basslerand E. O. Ulrich. The exact horizons at which some 
of the rare forms have been found are not known; hence these forms may have been 
assigned to wrong beds. Some species that are given as restricted to certain beds 
may prove to havea longer range, others may be found to be more restricted than 
here indicated. 
It is unfortunate that there is at Cincinnati no good representative collection of 
her fossils. The fine collections made in earlier years, which can probably never be 
duplicated, have been taken away. The magnificent collection of C. B. Dyer, which 
contained the choicest gatherings of a number of collectors for a long period of 
years, comprising a very large number of the rare forms, some of them unique, is 
now the property of the Museum of Comparative Zodlogy, at Harvard University, in 
Cambridge, Massachusetts. ‘The fine collection of I. H. Harris, of Waynesville, Ohio, 
which was especially rich in rare Richmond group forms, is now the property of the 
U.S. National Museum. The latter institution has also recently come into possession 
of the unrivaled collection of E. O. Ulrich, which contains a very large number of 
types of bryozoa, gastropoda, lamellibranchs and of other classes. The collection of 
U. P. James, very rich in bryozoa and also containing many types, has gone to the 
University of Chicago. The paleontological collection of the Cincinnati Society of 
Natural History consists mainly of odds and ends which have come to it piecemeal. 
14 
