i6o Cincinnati Society of Natural History. 



by him. " If it should be proved," he says, " that such a 

 vertical septum is truly wanting in C. typicalis. Hall, a new 

 genus must, I think, be established for its reception." (See 

 Mon. Brit. Grap., 1S72, p. iiS). 



Genus 4. — Dickanograptus, Hall, 1865. 



Polypary having its proximal portion diprionidian, but 

 dividing distally into two monoprionidian branches, which 

 have cellules on their outer aspect only ; cellules so welded 

 together that their mouths appear as if sunk below the gen- 

 eral surface of the polypary ; solid axis prolonged proximally 

 as a minute radicle, flanked by two minute lateral spines. 

 (Nicholson, Brit. Grap. loc. cit., p. 119). 



Remarks. — In this case, as with Climaco^raptus typica/is, no 

 definite description is given by Hall on the original proposal 

 as the name. (Canadian Organic Remains ; Grap. of Quebec 

 Group, 1865, p. 112). The description given above is, there- 

 fore, taken from Nicholson's Monograph. But one species 

 has been recorded from the Cincinnati group, given below. 



I. — D. RAMOsus, Hall, 1847. 



Stipe linear, narrow, about one line wide, compressed, 

 serrated on both sides, except branches ; teeth obtuse, distant, 

 somewhat narrowed toward the base, more than one-half the 

 width of the stipe ; stipe bifurcating or ramose ; branches 

 linear, .serrated only on outer margin. (Pal. of New York, 

 vol. I, 1847, P- 270, as GraptolitliHs ramosus). 



Locality. — Cincinnati. 



Remarks. — This species, under the name of (irapto/it/iiis 

 ramosus, is frequently mentioned in Hall's " Graptolites of the 

 Quebec Group." Nicholson also refers to it (Mon. Brit. 

 Grap., 1872), and gives an excellent figure. 



Genus 5.— Megalograptus, S. A. Miller, 1874. 



Stipe large, cylindrical or sub-cylindrical ; surface covered 

 with cells ; fronds with spinous processes on the margins ; 

 carbonaceous film covering one side. (Cin. Quart. Jour. 

 vScience, vol. i, 1874, p. 343). 



