SOME NEW SPECIES OF PALEOZOIC FOSSILS. 



S. CALVIN. 



In this paper are given descriptions of a few of the new 

 species of invertebrate fossils that, for some time, have been 

 awaiting suitable recognition in the collections of the writer. 

 The quarries and natural rock exposures of Iowa are rich in 

 forms illustrating the earlier geologic faunas. The conditions 

 under which these old faunas lived were, in this region, un- 

 usually favorable to the expansion of certain groups, and hence 

 there is a large number of species peculiar to the region. 

 Of these species a considerable proportion remains unde- 

 scribed, and it will be the purpose of the paleontological 

 papers contributed to the Bulletin to bring these hitherto 

 unrecognized forms to general notice. The papers will of 

 necessity be fragmentary. The exacting duties of a chair of 

 instruction leave Httle opportunity for original study, or for 

 the elaboration of conclusions. Moreover, the means at my 

 command for publication and illustration make it a present 

 necessity to issue papers that are individually but scraps and 

 fragments. 



We may reasonably hope that the study of the fossil faunas 

 of a region where life was so profuse and the conditions so 

 favorable for the preservation of individual forms, will throw 

 light on the interesting problems of the introduction and suc- 

 cession of organic types. The splendid results achieved by 

 Messrs. Wachsmuth and Springer in the study of our local 

 crinoids are an example of what may be expected when other 

 organic groups are studied with equal intelligence, leisure and 

 enthusiasm. Ordinary private means, or the means that can 

 be spared from the income of a collegiate institution, are as 



