THE ANNALS 



AND 



ft 



MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES.] 

 No. 77. MAY 1874. 



XLV. — On Duncanella, a new Genus of Pal(sozoic Corals. 

 By H. Alleyne Nicholson, M.D., D.Sc, F.R.S.E., &c., 

 Professor of Natural History in University College, To- 

 ronto. 



My friend Mr. U. P. James, of Cincinnati, well known 

 amongst American palaBontologists by his ' Catalogue of the 

 Lower Silurian Fossils of Ohio,' has recently placed in my 

 hands several specimens of a curious little coral from the 

 Niagara group of Indiana, which appears to me to form the 

 type of a new genus, and which I propose to call Duncanellaj 

 in honour of Professor P. M. Duncan, one of the highest of 

 living authorities on the fossil Actinozoa. The characters of 

 the genus are as follows : — 



Corallum simple, conical, free, and non-adherent. Calice 

 deep, circular, very slightly expanded above. Septa included 

 within the calice, apparently in multiples of six, extending to 

 the centre of the theca. A columella wanting, or at any rate 

 non-determinable. Epitheca well developed, with vertical 

 and encircling striae extending to the margin of the calice, but 

 deficient at the base, where it leaves a circular aperture from 

 which the septa protrude in the form of a small cone. No 

 tabulae or dissepiments. 



The affinities of Duncanella would appear to be with the 

 Turbinolidfe ; but it cannot be placed under any recorded 

 genus of this family, nor does it even show any decided rela- 

 tionship with any type of the Aporosa. 1 should have been 



Ann. & Mag. N. Hist. Ser. 4. Vol. xiii. 24 



