15G 



Unio varicosiis Lea. Ohio river. 



Unio ventricosiis Barnes. Ohio river; lakes in northern Indiana. 

 Unio verrucosus Barnes. Wabash and Ohio rivers. 

 Unio zigzag Lea. Ohio river, Wabash river. 

 ^ Unio donacifo^^nis Lea. 



Summarizing the data herein presented, exclusive of synonyms and 

 doubtful forms referred to the state by writers, we find the following to- 

 tals : Of land shells, 17 genera and 58 species ; of fresh water univalves, IS 

 genera and 47 species ; of fresh water bivalves, 5 genera and 102 species. 

 That the number of species will be largely increased on careful examina- 

 tion there can be no question. 



Louisville, Ky., Nov. 30, 1893. 



GEOLOGY. 



GEOLOGICAL LITEHATURE OF INDIAN A-(STRATIGRAPHIC 

 AND ECONOMIC:. 



By Verxox F. M.\rsters axd E. M. Kixdi.e.— Geological Department, In- 

 diana I'niversity. 



The following alphabetical list of the contributions to Indiana Geologi- 

 cal literature includes such as deal especially with the physical and econo- 

 mic phases of the subject, and only brief references to the larger and more 

 important contributions to the paleontology of the state. This list is so 

 arranged that the student can ascertain : First, what counties of the state 

 have been subject to investigation, second, by whom the work was done, 

 third, where the results are published, fourth nature and results of the investiga- 

 tions. A brief statement of the contents of the more important papers. Re- 

 ports, etc., is placed under the author'' s name. The references of tin economic 

 phase are placed under the heading Economic Geology which comes in its 

 proper place in the alphabetic series. Under this heading are placed the 

 following subdivision: Clays, coals, gas, hydraulic cements, oil, ore {minerah), 

 stone [hvilding). The reference to the paleontology of the state are not in- 

 cluded in detail in this list for the reason that they demand a somewhat 

 different treatment in order to make the treatise the most useful to the 

 student. 



