388 Forty-second Report on the State Museum. 



of myself to his friends were always cordial, and I received in 

 return their generous confidence, and assistance. Through his 

 intercession I have been able to travel over most of the railroads 

 of Indiana upon passes generously granted by the managers of 

 these roads, and to whom I especially wish to express my 

 obligations. 



While I have been engaged, as stated in the preceding pages, 

 Mr. J. M. Clarke has been steadily occupied in the preparation of 

 specimens for study and illustration, the superintendence of the 

 drawings, and the forwarding of all the work preparatory to its 

 final revision and preparation for the printer. 



The development of the internal apparatus of various species 

 has been carried on with the results indicated in the accompany- 

 ing list of preparations. This is an extremely tedious work, 

 requiring the exercise of much patience and mechanical skill, 

 but the result offers a very important means of acquiring a cor- 

 rect understanding of many brachiopodous genera. Microscopic 

 sections to show the structure of the shell have also been pre- 

 pared, and we have now 445 of these, representing 104 species 

 (see list). Many more are needed to insure the adequacy of conclu- 

 sions based upon this part of the study. Of the original draw- 

 ings necessary for the volume (as restricted), 125 have been 

 prepared since May, and about 250 more remain to be done. 

 Much of the material for these drawings is already in condition 

 for the draughtsman. There remain ten plates to be engraved, 

 and the accompanying table will show the condition of the 

 lithography. 



The preparation of the manuscript for the printer is also under 

 way. The scope of the work will require the discussion of 

 about 130 palaeozoic genera and subgenera. The synonymy of 

 these is, to a large degree, already prepared, the diagnosis of the 

 genera prepared to the number of forty-five, and the generic 

 discussions begun.* 



*At the date of printing this report there is manuscript ready for the printer equal to 

 150 pages of text, which will be printed by the beginning of January, 1890. 



