The Geology of Cincinnati. 69 
VERMES. 
Nereidavus varians Grinnell. Serpulites dissolutus Billings. 
CRUSTACEA. 
Acidaspis cincinnatiensis Meek, Bythocypris cylindrica (Hall). 
and varieties. Calymmene callicephala Green.(c) 
Acidaspis crossota (Locke). Ceratopsis chambersi ( Miller). (c) 
Aparchites minutissimus (Hall). Lepidocoleus jamesi (Hall and 
Asaphus gigas DeKay. Whitfield). 
: maximus Locke. Primitia centralis Ulrich. 
Bollia persulcata Ulrich (c) Ulrichia nodosa (Ulrich). (c) 
POSITION UNCERTAIN. 
Arthraria biclavata Miller. Pasceolus globosus Billings. 
Bythotrephis gracilis Hall. Rusophycus bilobatum Vanuxem. 
ny gracilis-crassa Hall. 
Lower Utica or Aspidopora newberryi Beds. 
For convenience of study the group may be divided into © 
three subdivisions, more easily distinguished faunally than 
lithologically, though close study shows lithological differ- 
ences, which soon come to be felt, but are not easily 
described. 
The lowest division to which the term Lower Utica will be 
applied, embraces about 80 feet and is on the whole rather 
unfossiliferous, that'is, there are many layers in which fossils 
are scarce or wanting, but on the other hand there are some 
layers which are very prolific in fossils; on the whole, the 
fauna is an abundant one. In the number of species it excels 
the next two divisions, possibly because there have been 
more exposures and it has been more carefully hunted than 
the succeeding divisions. In this division, as in fact 
throughout the Cincinnati period, the trepostomatous 
bryozoa are the most abundant fossils in point of number 
of individuals; perhaps two-thirds of all the fossils are tre- 
postomatous bryozoa. For a faunal designation the term 
Aspidopora newberryi beds is proposed, as this bryozoan is 
quite a characteristic and fairly abundant species in this 
division, but very rare, if occurring at all in the succeeding 
division of the Utica. 
