DESCRIPTION OF SPECIES ANTHOZOA 275 



trated and whose dimensions are given above, is much larger than any 

 of the others which have been observed, the colonies rarely growing to a 

 greater width than 12 millimeters and a length of 30 millimeters. 



CLADOCHONUS AMER1CANUS n. sp. 



Plate 10, figure 30 



Description. — Corallum slender, erect, consisting of funnel-shaped 

 corallites whose apertures are directed alternately in opposite directions. 

 Each corallite consists of two regions, proximal and distal, the proximal 

 portion being more slender, nearly straight or slightly curved, and in- 

 creasing gradually in diameter ; the distal region increases more abruptly 

 in diameter to the aperture and curves laterally to such an extent that 

 the plain of the aperture is approximately parallel with the axis of the 

 corallum. On its upper side, the side of longest curvature, each corallite 

 gives rise to a new corallite by budding from its distal region. 



The dimensions of the type specimen are: Length of three successive 

 corallites, 10 millimeters, 9 millimeters, and 9 millimeters; maximum 

 diameter of aperture, 4.5 millimeters; minimum diameter of corallite at 

 point of origin, 2 millimeters. 



Remarks. — The genus Cladochonus has not previously been recognized 

 in the Mississippian faunas of America, although it is represented by 

 several species in the corresponding formations of Europe. It is not a 

 common form in the Fern Glen fauna, the single specimen here described 

 being all that has been observed by the writer. The genus occurs else- 

 where in America — in the Chouteau limestone, where one or two unde- 

 scribed species have been collected, and in the Burlington limestone, 

 where it is represented by Aulopora gracilis Keyes. The genus Clado- 

 chonus differs from Aulopora in its erect habit of growth, it being attached 

 only at its base or at more or less remote points. 



MONILOPORA CRASS A (McCoy) 

 Plate 10, figures 31-33 



1844. Jania crassa McCoy, Synopsis of Carboniferous Limestone Fossils of Ire 



land, page 197, plate 27, figure 4. 

 1847. Cladochonus {Jania) crassus McCoy, Annals and Magazine of Natural 



History, series 1, volume 20, page 227. 

 1849. Cladochonus crassus McCoy, Annals and Magazine of Natural History, 



series 2, volume 3, page 134. 

 1851. Cladochonus crassus McCoy, British Paleozoic Fossils, page 85. 

 1854. Cladochonus crassus Morris, Catalogue of British Fossils, second edition, 



page 44. 



