198 
IOWA ACADEMY OF SCIENCES 
Among the most characteristic Lime Creek species found in this reg- 
ion are: 
Spirifer hungerfordi Hall. 
Spirifer orestes Hall & W. 
Spirifer fornicula Hal. 
Spirifer wliitneyi Hall. 
Strophodonta demissa (Conrad). 
Strophodonta calvini Miller. 
Strophodonta perplana (Hall). 
Atrypa reticularis (Linn), 
lihipidomella livia (Billings). 
Strophonella coelata Hall. 
Ortholetes chemungensis Hall. 
Productella speciosa Hall. 
Cyrtina hamiltonensis Hall. 
Cyrtia cyrtiniformis (Hall & W.) 
Dialasma calvini (Hall & W.) 
Pugnax pugnus (Martin). 
Schizoplioria striatula (Schlotheim) . 
Bellerophon sp ? 
Loxonema sp ? 
Acervularia profunda (Hall). 
Acervularia davidsoni (Edwards & H.) 
Pachypliyllum woodman! (White). 
Cladopora prolifica (Hall & W.). 
Cyathophyllum sp ? 
Stromatopora erratica (Hall). 
Melocrinus sp ? 
The above forms are the most striking and the easiest indentified. 
There are a large number of others. A little work on the part of some 
one familiar with Devonian types of life and especially with the Iowa 
species, would, no doubt, establish a prolific fauna. It is a field worthy 
of attention. 
