Paleontology of the Ciiiciniiati Group. i6i 



Remarks. — This is quite an anomalous genus, being entirely 

 distinct from an}- other known graptolite. Its position in any 

 system of classification is as yet undetermined. Only one 

 species is known. 



I. — M. WELCiii, Miller, 1874. 



Surface of polypary smooth, mostly covered with cells im- 

 mersed in the body of the frond ; openings circular, about 

 one thirty-second of an inch in diameter and one-sixteenth of 

 an inch apart ; cellules not extending to the edge of the 

 polypary, but ceasing about one-quarter of an inch from the 

 edge ; numerous spines borne on the edges of the frond, 

 varying from one-quarter to one-half an inch in length, sharp 

 and sometimes branched ; frond divided into sections by 

 transverse constrictions, each section bearing from two to four 

 spines; spines probably originally round, but flattened by 

 compression ; whole surface, when well preserved, covered by 

 a black, carbonaceous film, the cell openings only lacking this. 

 (Ibid, pp. 343-346). 



Locality. — Clarksville, Clinton County, Ohio. 



Remarks. — As noted above, there is only one species in this 

 genus. No one has written upon it except Mr. Miller. In 

 his "North American Geology and Palaeontology" (1889), his 

 original figures are reproduced, but no new information is 

 given. 



Genus 6. — Inocaulis, Hall, 1852. 



Frond composed of numerous flattened, corneous or scab- 

 rous bifurcating stems, having a fibrous or plumose struc- 

 ture. (Pal. of N. Y., vol. 2, 1852, p. 176). 



Remarks. — This is also an anomalous genus, and its position 

 in the order is very uncertain. No cellules are known in any 

 species referred to it. In a previous paper (Fucoids of the 

 Cincinnati Group, this Journal, vol. 7, p. 164), by the writer, 

 it is suggested that a form described by Miller and Dyer as 

 LicrophycHs flabellum should be referred to the present genus. 

 It is evident, however, that this was an error. The species in 

 question is more likely the burrow of an annelid. Only one 

 species has been referred to this genus from the Cincinnati 

 group. It is here referred to the genus Dictyonema as D. 

 arbi(sei<Iui>i, which see (ante). 



