Protozoa of tlic Cincinnati Group. 247 



Genus I. ASTYLOSPONGIA, Roemer. i860. Die Silur. 

 Fauna des West Tenn., p. 7. 



Microspoiigia, Miller and Dyer. 1878. Jour. Gin. Soc Nat- 

 Hist., I., p. 37. 



Globular, nearly regular, free : large canals running from the 

 center outward, intersecting smaller, concentric canals: internal 

 structure stellate, the rays cohering; spiculje (?) small, star-like 

 objects in the midst of the mass. 



1. A. GREGARiA, Miller & Dyer. 



Microspongia gregaria, M. & D. 1878. j. G. S. N. H., vol. 

 I-, P- 37 ; Pl- 2, fig. 2. 



Chcetctes siibrotundata, U. P. James, !878. The Pal?eon- 

 tologist, p. I. 



Astylospongia subrotiiiidata, U. P. James. Ibid, p. ti. 



Globular, compact, sometimes as if two or three united into a 

 cluster : one-quarter to three-quarters of an inch in diameter : 

 needle-shaped spiculas (?) visible under high magnifying power. 



Locality: Cincinnati; Ogden Station, Clinton County, Ohio. 



The characters given for Alicrospotigia are not sufficient to 

 separate it from Astylospongia. A. siibrotundata, James, was first 

 referred to Chcctetes {a.'sa.hovtt),h\.\i afterward placed in Astylospongia. 



2. A. TUMiDA, U. P. James. 1878. The Palfeontol- 

 ogist, p. I. 



Sub-globose, depressed, with a cavity on one side; surface 

 rough, pitted, sometimes lobed. 

 Locality: Cmcinnati. 



Genus 2. PATTERSONIA, S. A. Miller. 1882. Jour. Cin. 

 Soc. Nat. Hist., vol. V., p. 43. 



A solid, amorphous mass of uniform structure, and destitute 

 of openings: surface irregular; often appearing as if several speci- 

 mens were united in a cluster. 



P. DiFFiciLis, 8. A. Miller. Ibid. p. 43. PI. 2, figs. 3, 3 a. 



Character of the genus. The only species known. It may, 

 on further examination, prove to be a Stromatopora. 



Locality : Cincinnati, O. 



Genus 3. BRACHIOSPONGIA, Marsh, 1867. Am. Jour. 

 Sci. and Arts. Series 2, vol. XLIV., p. 88. 



Body nearly hemispherical ; arms extending out from lateral 

 surface; hollow, with arms opening into the body cavity. 



