Paleontology oj the Ciiicitiuali C,'roiif>. 71 



congeneric with /h'stoctospoti^ia iiiso/eiis, regarded as a mas- 

 sive form. Tile description is meager and vague, and unac- 

 comi)anied b}- an illustration. This renders it difiicult to 

 recogni/e the species. Future studies may furnish further 

 information. 



(icnus 14. — Hi':tkrospongia, Ulrich, 1889. 



vSub-lol)ate, or with irregularly divided, compressed branches. 

 " Entire surface exhil)iting the mouths of branching and more 

 or less tortuous canals, which begin near the center, where 

 they are nearh- vertical, and proceed toward all -portions of 

 the surface in a curved direction. A limited number of 

 ' oscula,' distinguished from the ordinary canals by being 

 larger and surrounded by radiating channels, occasionally 

 present. 



"Sponge skeleton between the canals of variable thickness, 

 sometimes appearing nearly solid, at other times composed of 

 loosely interwoven spicule fibers. None of the specimens 

 show the spicules in a satisfactory manner. From the traces 

 seen it would appear that the}- are mostly very small, and of 

 the three rayed type." (Ibid, pp. 239, 240.) 



Remarks. — Mr. Ulrich considers this genus related to the 

 preceding, Dvstactospongia, remarking that the four or five 

 species of Miller's genus known to him are parasitic, or form 

 amorphous masses. But two species of Dystaetospongia have 

 so far been described. 



I. — K. SUBRAMOSA, Ulrich, 1889. 



Sub-ramose or palmate ; branches more or less flattened, 

 from 9 to 13 mm. thick and from 11 to 30 mm. wide ; surface 

 generally even, with irregularly distributed canal apertures ; 

 these of varying size, the average diameter being 0.7 mm., 

 with five in five mm.; space between apertures varying from 

 0.2 mm. to 1.2 mm.; sponge skeleton composed of more or less 

 loosely interwoven fibers, though the interspaces generally 

 appear solid and structureless ; spicuke undetermined. (//. 

 kiiotti, Ulrich, i88g.) (Ibid, pp. 240, 241.) 



Locality. — Marion and lyincoln Counties, Kentucky ; Cin- 

 cinnati, Ohio (?), and Spring Valley, Minn. (?). 



Remarks. — We have placed H. knotti as a synonym of this 



