68 

 Hudson rivek fossils of Jefferson cointv, Indiana. By Geo. C. Huh- 



BABD. 



In the Geological Report of Indiana for 1874, there appeared a list of 

 Hudson River fossils prepared by Dr. W. J. S, Cornett, containing the 

 names of seventy-six species and varieties. They were classified as ^jfon- 

 tx, encrinites, parasitic corals, unhrtlvcs, orthis and trilobites. Among the "or- 

 this" were modiolopsis modiolaris, a lamellibranch, and streptelasma cor- 

 niculum, a cup coral. Tetradium fibratum, a columnar coral, was placed 

 under "univalves." Young and old of the same species were sometimes 

 classed as two species. Strophomena nutans, which has never been found 

 in Indiana, was included in the list. These and similar errors, together 

 with the incompleteness of the list, call for a second attempt. 



The species included in this second list have been collected chiefly by 

 myself in the vicinity of Madison. Most of the crinoids, however, were 

 named from Mr. Jno. Hammel's extensive collection. 

 The list, which is too long for an abstract, contains: 



Plantse 8 species. 



Porifera 6 " 



Anthozoa 25 " 



Crinoidea 28 



Stellerida " 



Bryozoa 14 " 



Brachiopoda 32 " 



Pteropoda 3 



Gasteropoda 20 " 



Cephalopoda 18 " 



Lamellibranchiata 26 " 



Annelida • 4 " 



Crustacea 8 " 



Total 198 



Among these some ten or twelve are believed to be undescribed species. 



The upper limit op the lower Silurian at Madison, Ind. — By George C. 

 Hubbard. 

 The upper strata of the bluffs along the Ohio river belong to the Niagara 

 group, and the lower to the Hudson river or Cincinnati group ; but the 

 exact line of demarcation between them has long been an unsettled ques- 

 tion. The importance of this parting is recognized when we remember 



