Report of the State Geologist, 41 



Palaeozoic Brachiopoda, which were described more than twenty 

 years since. 



I may also in this place be permitted to make special acknowl- 

 edgment to the following gentlemen for the loan of specimens 

 from their private collections in aid of this work upon the 

 Brachiopoda since its commencement in 1888. 



In my first efforts to obtain specimens for the illustration of 

 the volume I was indebted to Mr. Thomas A. Greene of Mil- 

 waukee for the loan of large collections of the Inarticulate 

 Brachiopoda of the genera Trimerella, Monomerella, Dinobolus, 

 etc., from the Niagara group of Milwaukee and adjacent localities, 

 which have been used in the discussion of certain genera and are 

 illustrated upon the plates of the volume. He has also loaned 

 from his collection of Silurian Articulate Brachiopoda specimens 

 of the genera Orthis, Orthotetes, Leptaena, Strophodonta, 

 Kafinesquina, Spirifer, Pentamerus, Ehynchonella, and several 

 Athyroid genera, etc., for use in the second part of the volume. 



To Prof. J. S. Newberry, of Columbia College, for specimens of Orthis, 

 Athyris, Spirifer, Pentamerus, Rhyn'chonella and Camarella from the 

 Silurian ; Ehynchonella, Leibrhynchus and Meristella from the 

 Devonian; and of Lingula, Orbiculoidea, Orthis, Enteletes, Derbya, 

 Productus, Spirifer, Syringothyris, Athyris and Dielasma from the 

 Carboniferous. 



To Prof. J. M. Safford, State Geologist of Tennessee, I am under 

 obligations for the loan of a very important collection of Orthids, 

 representing several little known Lower Silurian species; also for 

 an interesting collection of Scenidium from the same geological 

 horizon. 



To Prof. Edward Orton, State Geologist of Ohio, I am indebted for 

 specimens of Lingula, Orbiculoidea and Trimerella of tte Inarticulate 

 Brachiopods and of Orthis, Strophomena, Triplecia, Meristella, Spiri- 

 ferina, etc., from the Silurian and Carboniferous formations. 



To Prof. C. S. Herrick, of Benison University, now of the University 

 of Cincinnati, for specimens of Orbiculoidea, Orthis, Spirifera, Spiri- 

 ferina, and Syringothyris from the Waverly group of Ohio. 



To Prof. J. P. Lesley, State Geologist of Penna., for specimens of 

 Orbiculoidea of the Devonian. 



To Prof, G. C. Broadhead, of the University of Missouri, for speci- 

 mens of Enteletes, Chonetes, Derbya and Productus from the Upper 

 Coal Measures. 



6 



