THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



TFOURTH SERIES.] 

 No. 104. AUGUST 1876. 



IX. — Notes on the Palceozoic Corals of the State of Ohio. 

 By H. Alleyne Nicholson, M.D., D.Sc, F.L.S., 



Professor of Natural History in the University of 

 St. Andrews. 



[Plate v.] 



In tlie spring of the year 1874 I was asked by Professor 

 Newberry, the accomplished head of the Geological Survey 

 of Ohio, to undertake the description of the Corals Avhich had 

 been obtained by the officers of the Survey within the limits 

 of the State. At this time I was on the point of leaving 

 America for England ; a large part of my private library was 

 already packed up ; and the only public library to which I 

 could refer was very imperfectly supplied with works dealing 

 with the Palasozoic corals. I had, further, neither the time 

 nor the means for making the necessary microscopic sections 

 of the specimens submitted to me. Under these circum- 

 stances, it was inevitable that errors would be committed to 

 some extent. Since my return to England, my collections 

 remained for long packed up ; and I had no opportunity of 

 revising the proofs, or of rectifying these errors, before the 

 second volume of the ' Palaeontology of Ohio ' went to press. 

 I have, however, during the last winter unpacked my collec- 

 tions of American corals, and have sliced a large number 

 of them for microscopic examination. I wish, therefore, now 

 to correct such mistakes as were made in my original Report, 

 and to add certain details which were there omitted. On the 

 present occasion I shall confine my remarks to certain of the 

 species of Chcetetes^ Constellaria, and Streptelasma. 

 Ann. dc Mag. N. Hist. Ser. 4. Vol. xviii. 7 



