Tlie Era of Invertebrates 



Avitli hammer and pick instead of rope and 

 dredge, none the less has it yielded up its 

 treasures in abundance. The rocks in the city 

 of Cincinnati and the hills round about have 

 furnished many specimens of crinoids, but most 

 celebrated of all localities is Burlington, Iowa, 

 from whose quarries have come more species 

 than from any other place. At Crawfordsville, 

 Ind., is a bed of bluish sandy clay two or three 

 feet in thickness, from which many thousand 

 specimens have been taken and distributed 

 among the principal museums of the world. In 

 excavating a cellar at Kansas City the workmen 

 came upon a colony of crinoids which yielded 

 many hundred specimens of one species and in 

 a better state of preservation than at any other 

 locality. 



But it must not be imagined that one may 

 go out at any time and obtain fine specimens. 

 Far from it ! These animals seem to have grown 

 in colonies and to occur as fossils in very re- 

 stricted localities, while round about there may 

 be few or none. And happy is the collector 

 who chances upon a "pocket" containing one 



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