On the Monticjtliporoid Corah of the Cincinnati Group. 33 



In part first of this paper (Vol. X. pp. 134, 140, this Journal) 

 Crcpipora was placed as a synonym under Ceramopora : while Cheilo- 

 porclla was placed as synonym under Monticulipora proper. At 

 the present writing we consider them more properly placed under 

 Fistulipora as above. 



Key to Species. 



a. Corallum ramose, cylindrical, or lobate. 



* Monticules or maculae made up of many minute 



- tubuli 56 



^Maculae made up of few tubuli 57 



^Maculae wanting. 



t Calices circular, oblique 59 



f Calices elevated, arranged in lines 58 



b. Corallum incrusting. 



* Calices circular, oblique 59 



* Calices oval, with a distinct ring like wall 60 



56. M. (Fistulipora) venusta, Ulrich. 

 ChcBtctesvenusfiis, Ul. Jour. Cin. S. N. Hist. I, 93, 1879. 

 Crepipora venusta. Ul. Ibid, V, 257, 18S2. 



Chcetetes granuliferous, Ul. Ibid, II, 128, 1879. 



Ho/notrypella granulifcrous, Ul. 14th Rept. G. and N. Hist. 

 Sur. Minn. 83, 1886. 



Corallum dendroid, branching at variable distances ; branches 

 generally hollow, the inner surface lined with an epithecal mem- 

 brane; varying from two to ten lines in diameter, and sometimes 

 irregularly thickened or nodulated. Surface nearly smooth, some- 

 times with low, rounded monticules, the summits occupied by thirty 

 or more minute tubuli ; Sometimes depressed instead of elevated. 

 Calices varying in size and form, circular, oval, sub-polygonal or 

 rhomboidal. Interstitial spaces thin or thick, with few interstitial 

 corallites. 



Obs. — This species was referred by one of us to Callopora in our 

 collection as a new species, but Mr. Ulrich's name has precedence. 

 From the hollow branches, with a strongly wrinkled dermatic crust, 

 and the peculiar feature of the minute tubuli occupying the center 

 of the monticules, it seems readily distinguished. The variation 

 presented by thin or thick intercellular spaces we regard as due 

 merely to weathering, and to show this is not unlikely we refer to 

 remarks upon M. i^F.) nicholsoni, (No. 59). 



