1888.] NATURAL SCIENCES OF PHILADELPHIA. '225' 



times of certain species ; and also on account of the close similarity 

 in many respects, of this and the fauna of the lower coal measures 

 of eastern Illinois, particularly that of the superimposing black 

 shales of the "Danville" coal, or coal "No. 7" of the general 

 Illinois section. Stratigraphically the relations of these two fossilif- 

 erous shales to the principal coal-beds are the same — each forming 

 the roof of the most extensive coal stratum in their respective 

 localities ; lithologically the two shales are apparently identical. 



CCELENTERATA. 



Lophophyllum proliferum McChesney. 



Cyathaxonia prolifera McChesney, 1860. Disc. New Palseo. Fos. 



p. 60. 

 Cyathaxonia sj)'?. Geinitz, 1866. Carb. und Dyas in Nebraska, 



pp. 65, 66, tab. v, figs. 3-4. 

 Lophophyllum proliferum Meek, 1872. U. S. Geol. Surv. of 



Nebraska, p. 144. 

 This species though a characteristic, and usually one of the most 

 abundant, fossils of the coal measures is extremely rare in the lower 

 coal measures of central Iowa; however, it is not to be expected 

 that the remains of coelenterates would occur very abundantly in 

 bituminous shales. 



Rhombopora lepidodendroides Meek. 



Rhomhopora lejndodendroides Meek, 1872. U. S. Geol. Sur. of 



Nebraska, p. 144. 

 Rliomhopora lepidodendroides White, 1875. Expl. and Sur. W. 



100 merid. Vol. IV, pt. 1, p. 99. 



From the lower coal measures but a single specimen of this species 



has been collected. In a thin band of limestone of the middle coal 



measures about one hundred feet higher than the horizon from 



which this specimen was found, this species occurs quite abundantly. 



ECHINODERMATA. 



Eupachycrinus (sp. ?). 



The only remains of echiuoderms as yet discovered in the black 

 shales are a few stem joints and a brachial plate which evidently 

 belong to one of the coal measure species of this genus. 



BRYOZOA. 



Synocladia biserialis Swallow. 

 Synocladia biserialis Swallow, 1858. Trans. St Louis Acad. Sci.,. 

 Vol. I, p. 179. 



