S. Calvin—Fauna at Lime Oreek, Iowa. 433 
Strophodonta exilis Calvin.* 
Strophonella reversa Hall. 
Strophonella hybrida H. & 
Streptorhynchus Ohemungensi re 
is ¢ 
Productella Uissimilis Hall. 
P 
roductel a 
Spirifera Whitneyi Hall. 
Spirifera Hunger ord Hall. 
Sp hi estes & W. 
Abe 
Cyrtina Dowaicnntes var. recta H. 
Aitrypa reticularis Lin. 
Atrypa hystric Hall. 
Rhynchonella contracta, var. saxatilis H. 
Leiorhynchus iris Hall. 
Leiorhynchus (undescribed species). 
Gypidula occidentalis Hall. 
‘mi Orthoe 
Plates of Placoderm fies. allied to Dinichthys. 
That the High Point fauna, as given by Professor Williams, 
bears a close resemblance to the Lime Creek fauna, will be 
. This species was described by me in the Ballet of the cos — Geo- 
logical Survey of the Territories, vol. iv, No. 3, a op quadra . epher 
hame, however, was preoccupied by Professor ‘aialiow (Proceedings 
Academy of a 1860), and I, therefore, propose to substitute the above 
name in Poni that originally a applied. é 
This fi f Spirifera is not very rare in the Rockford Shales. It dif- 
t ne esti of Sp ry Pe ee acs 
ie from all described forms in many important parti rticulars. 
h of 
ssor T. H. persion of 
