Paleontology of the Cincinnati Group. 



57 



quoted, and they are also based mainly upon si/e. None of 

 them are from the Cincinnati horizon. Probably all the 

 species are fragments of one. They certainly possess few 

 recognizable characters, according to the descriptions. 



Genus 6. — Riiomhodictvon, Whitfield, i8S6. 



" Globular, discoid or broadly cyathiform fossil bodies, com- 

 posed of two or more sets of more or less rigid rods or threads, 

 crossing each other at various angles, but not ])i furcating or 

 dividing, 'and leaving rhombic spaces, which are filled with 

 carbonaceous or other substance." (Bull. Am. Mus. Nat. 

 Hist., Central Park, vol. i, i<S86, p. 347.) 



Remarks. — Two species and one variety are described b}' 

 Profes.sor Whitfield, and referred to this genus. Its affinities 

 are .stated to be with the Dictyophytons. The following 

 species is as yet the only one recorded from the Cincinnati 

 group : 



R. GLOBOSU.S, n. sp. 



Fig. 2.^Rhombodictyon glohnsiis, n. sp. a. Showing one face of .specimen, wiUi 

 radiating lines, d. Opposite side of same specimen, r. Ground surface showing 

 pit-like markings. 



