54 Cincinnati Society of Natural History. 



Remarks. — Two species have been referred to this genus 

 from the Cincinnati group, A. tnmidus, James, and A. subro- 

 tundus, James. Neither of these seem to belong to Astylos- 

 pojigia. The first seems to be a species of Pasccolus, as there 

 are indications of surface plates, and it is referred there pro- 

 visionally. The second is possibly congeneric with Hindia or 

 Microspoigia. It is referred to the latter genus provisionally. 



Genus 2. — IvEptopoterion, Ulrich, 1889. 



Remarks. — This genus and its type species, L. mammifenivi, 

 was founded upon a single specimen about three inches high, 

 and a little more than half as wide at the top, and in such a 

 poor state of preservation that, we are told, the " minute 

 details of its structure have been almost obliterated by re- 

 placement with iron pyrites. The outer surface, where best 

 preserved, is finely reticulated, being traversed by lines and 

 series of points ranged in very regular diagonally intersecting, 

 transverse and longitudinal directions." (Am. Geologist, vol. 

 3, 1889, p. 239). Neither the genus nor the species can be 

 recognized from the description. No figure has, as far as the 

 writer knows, been published. The author of the species 

 may, in the future, have further material to elucidate his 

 species. 



Locality. — Roll's Hill, Cincinnati, O. 



Genus 3. — Microspongia, Miller & Dyer, 1878. 



" A free calcareous sponge, destitute of an epitheca. The 

 texture is finely porous, without large canals or openings on 

 the surface. Spicules (?) very minute and needle shaped." 

 (Jour. Cin. Soc. Nat. Hist., vol. i, 1S7S, p. 37.) 



The above is the very unsatisfactory definition of the 

 authors. Nothing has been added to our infornialioii in regard 

 to it since the description was publislicd. 



I.— M. c.KiccAKiA, Miller c\: Dyer. 1878. 



Small, gregarious, glol)ular and calcareous; free, and with- 

 out an epitheca. In structure fii^rous or minutely porous, 

 compact. Spicules (?) needle shaped. Varying in size from 

 one-eighth to more than one-half an inch in diameter. (Jour. 

 Cin. Soc. Nat. Hi.st., vol. 1, 1878, p. 37.) 



