56 Cincitinati Society of Nntural History. 



considered the "poles" toward the "equatorial" region. It 

 is referred to I\Iicrospono;ia with doubt, as the minute struc- 

 ture of that genus has not, as far as known, been described. 



Localities. — Ogden Station, Clinton County, Ohio. Speci- 

 mens scarcely to be distinguished from it occur in strata of 

 similar age on Little Maquoketa River, Iowa. 



Genus 4 — Hindi a, Duncan, 1879. 



Free ; central space occupied by spicules, soon forming a 

 series of bifurcating, straight, radiating canals, opening at the 

 surface. Spicules calcareous, more or less in form of a 

 stemmed tripod with four limbs, and swollen or fringed at the 

 edges, where junction with others take place. (Annals and 

 Mag. Xat. Hist., 5th ser., vol. 4, 1H79, p. 91.) 



Remarks. — The only species referred to this genus from the 

 Cincinnati group as ^-et is H. parva, Ulrich. As already 

 stated, that is apparently a synonym for Microspongia gregaria. 



Genus 5 — Cvlixdroccelia, Ulrich, 1889. 



Free, cylindrical, with the lower end pointed or truncate. 

 Hollow in the sub-cylindrical portion ; walls thick, traversed 

 b}' irregularly di.sposed, radiating canals; a few penetrate the 

 thin dermal layer on the outer and inner surfaces, and when 

 the dermal layer is worn away, the sub-circular mouths ap- 

 pear. (American Geologist, vol. i, 1889, pp. 245, 246 ) 



I. — C. coviNGTONENSis, Ulrich. 



vSub-cylindrical ; tapering in a length of 45 mm. from a 

 diameter of 25 mm. to one of 32 mm.; diameter of opening at 

 lower end 6 mm., and at upper 22 mm.: wall var\ing from 3 

 mm. to 10 mm. in thickness; canals averaging 1.5 mm. in 

 diameter, with an average of eight in a space 10 mm. square; 

 canals penetrating the wall in an irregular manner. (Ibid, 

 p. 247.) 



Locality. — Covington, Kentucky. 



Remarks. — This species seems almost entirely based upon 

 size. The diameters of the specimens, the thickness of the 

 walls, and the size of the canals are given with great minute- 

 ness. All other features seem to be lacking. Three other 

 soecies belonging to the genus are described in the volume 



