The Intumescens Fauna. — Clarke. 95 
with strong concentric flutings on the early whorls, which become less 
conspicious with age and at maturity form sharp, close, concentric lines. 
Goniatites sp. A species with a broadly flaring chamber of habitation 
and suture similar to that of G. iniienstcri. 
Goniatites sp. A primordial goniatite like G. intumescens, but small, 
less umbilicate, with closely crowded septa and sharply angled lobes 
and saddles. 
Goniatites sp. A deeply umbilicated species, with broad grooved, dor- 
sum and costate whorls ; cf. G. tuberculatus Holzapfel. 
Besides these species of goniatites there is some more or less imper- 
fect material which indicates the existence of a few additional forms. 
Orthoceras paeator Hall. 
OHhocerns aclculoides Clarke. 
Orthoceras Ontario Clarke. 
Orthoceras filosurn Clarke. 
Orthoceras sp. nov. 
Bactrites sp. nov. 
Bactrites sp. 
Hyolithes neapolis Clarke. 
Coieolus acicxdum Hall. 
Tentaciilites gracilistriatus Hall. 
Styliolina fissurella Hall. 
Macrocheilus sp. nov. 
Platyswma minutissimum Clarke. 
Plcurotomaria itys, var. tenuispira Hall. 
Palceotrochus jwcecursor Clarke. 
Loxonema noe Clarke. 
Bellerophon nataor Hall. 
Bellerophon incisus Clarke. 
Bellerophon sp. nov. 
Leptodesina cf. Lichas Hall. 
Leiopteria Icevis Hall. 
Grammysia sp. nov., of the general expression of G. suharcvata Hall. 
Macrodon sp. 
Nitcnla, cf. diffidens Hall. 
Palceoneilo muta Hall. 
TJmjulina siiborbicularis Hall. This abundant shell is very variable. 
In a large number of finely preserved individuals, it appears that the 
nearly bilateral form with quite sharp concentric lines represented in 
the typical example, is of rare occurrence. Such forms sometimes show 
fine radiating lines and are connected by a normal series with shells in 
which the body of the valve is oblique and the surface freciuently rugose 
from concentric growth-lines. The genus of this fossil is evidently not 
Ungidina, probably neither Cardiomorpha nor Edmondia. The shells 
described by H. S. Williams (Bull. No. 10, U. S. Geol. Surv.) as Lucina 
ivyomingensis and L. varyshtirgia, from this horizon in Genesee county, 
I am unable to identify from the figures and descriptions. There are 
before me 30 excellent preserved individuals of a species evidently con- 
generic with these (but by no means Lucina). They are probably ident- 
