[Annais N. Y. Acad. Scr., XI, No. 7, pp. 117 to 126, May 17, 1898.] 



DESCRIPTIONS OF DEVONIAN CRINOIDS AND 

 BLASTOIDS FROM MILWAUKEE, WISCONSIN. 



S'J'UART WeLLER. 

 (Read February 21, 1898.) 



[Plate XIV.] 



The Devonian strata at Milwaukee, Wisconsin, consist of two 

 distinct formations. The lower of these is the hydraulic lime- 

 stone which is quarried for the manufacture of cement. In 

 this limestone the fossils generally occur as internal casts and 

 external impressions, though some of the smaller forms are 

 sometimes replaced by pyrite. Lying above the limestone is 

 a bed of soft, blue, easily disintegrated shale, containing some 

 thin bands of harder limestone. In this shale the fossils are 

 abundant and often occur perfectly preserved. 



The faunas of the two horizons are markedly different, scarcely 

 a species which occurs in the limestone being present in the 

 shale. In the limestone fauna there are many species identical 

 with those in the Hamilton group as typically developed in New 

 York, wliile in the shale the species are apparently more nearly 

 allied to species in the lowan Devonian faunas. 



The crinoids and blastoids here described are all from the 

 shale, and while the crinoids are quite different from other 

 members of the genus to which they belong, they are to be 

 compared with .species which have been described from Iowa 

 and Missouri rather than with any of the more eastern species. 



With the exception of Pentremitidea fihsa (?) which was col- 

 lected by Mr. A. W. Slocom, all the specimens were collected 

 by Mr. E. E. Teller, of Milwaukee, and are now in his collection. 



Annals N. Y. Acad. Sci., XT, May 17, 1898 — 9. 



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