THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
(FIFTH SERIES.] 
No. 71. NOVEMBER 1883. 
XX XII.— Contributions to Micro-Paleontology.—On Steno- 
pora Howsii, Nich., with Notes on Monticulipora? tumida, 
Phill., and Remarks on Tabulipora Urii, Young. By H. 
ALLEYNE Nicuorson, M.D., D.Sc., Regius Professor of 
Natural History in the University of Aberdeen. 
[Plate X.] 
1. Stenopora Howsii, Nich. 
In a recent visit to Northumberland I was fortunate enough 
to obtain a considerable number of specimens of the singular 
_ Stenopora Howsit, Nich., of which I had previously published 
_ ashort provisional description and figures, based upon a mag- 
_ nificent example in the cabinet of Mr. Richard Howse, F.G.S. 
(see ‘The Genus Monticulipora,’ p. 83, fig. 12, 1881). 
_ Having, therefore, now had the opportunity of examining a 
_ large series of specimens in all stages of growth, and also of 
_ preparing a number of thin sections, I purpose giving on the 
present occasion a fuller description of the characters of this 
_ remarkable type. 
___ As regards its essential specific characters the corallum of 
Stenopora Howsti is ramose, with subcylindrical or flattened 
branches, which are mostly from } to 4 inch in diameter. 
Ann. & Mag. N. Hist. Ser. 5. Vol. xii. 21 
