THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTOllY, 



[FOURTH SERIES.] 

 No. 104. AUGUST 1870. 



IX. — Xotes on the Palceozoi'c Corals of the State of Ohio. 

 By 11. Alleyne Nicholson, M.D., D.Sc, F.L.S., 

 Professor of Natural History in the University of 

 St. Andrews. 



[Plate v.] 



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

 Newberry, the acconi])lished head of the Geological Survey 

 of Ohio, to undertake the description of the Corals which liad 

 been obtained by the officers of the Survey within the limits 

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

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

 already ])acked up ; and the only public library to which I 

 could refer was very imperfectly sujtplied with works dealing 

 with the Palaeozoic 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 c^ rectifying these errors, before the 

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

 I iiave, 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 Kcport, 

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

 present occasion I shall confine my remarks to certain of tiie 

 species of CluvtctcSy Constel/aria, and Streptelasma. 

 Ann. d' Mnff. X. /fist. Scr. 4. Vol. xviii. 7 



