1 66 Cincinnati Society of Natural History. 



Nebulipora lens, McCoy. Ann. and Mag. of Nat. Hist., s.er. 

 2, VI , 283, 1850. Brit. Pal. Foss , 23, 1S51. 



Fistulipora lens, Whitfield. Ann. Rept. Geol. Sur. Wisconsin 

 for 1877, p. 69. Geology of Wise, IV., 156, 1882. 



Monticulipora {Heterotrypa) circularis, U. P. James. The 

 Palasontolo^Mst, 46, 1882. Ibid, 58, 1883. 



Calloporella harrisi, Ulrich. Jour. Cin. Soc. Nat. Hist., VI., 

 91, 1883. 



Corallum circular, concavo-convex, the concavity of the base 

 corresponding to the convexity of the upper surface; varying in 

 size from less than one-fourth of an inch, to an inch in diameter, 

 and from one-half to about one line in thickness. Upper surface 

 smooth, destitute of monticules, and with occasional groups of 

 cells slightly larger than the average ; underside lined with a very 

 thin epitheca, occasionally worn away so as to show the bases of 

 the corallites underneath; when present showing fine concentric 

 lines and radiating striae. Embedded specimens sometmies found 

 with the underside uppermost Calices circular, or nearly so, 

 often arranged in regular lines, with from four to twelve or more 

 in a row. Walls of cells in well preserved specimens thin, but 

 in worn ones thicker. In the last case a good magnifying power shows 

 the spaces between the larger cells with many small cells or pores. 



Obs. This species is well charactei ized by its circular form, 

 and by the regular arrangement of the cells in curved lines. The fact is 

 jjeculiar that three separate investigators in naming the fossil, should 

 choose the same name in two cases, and a word meaning the same 

 thing in the third instance. There can be no doubt that Prof. 

 Whitfield's Fistulipora lens belongs to this species, though the two 

 were found in localities so far apart. Nor can there be a (jueslion 

 but that the other two, M. circularis and Calloporella harrisi are 

 likewise synonyms of J/, lens, McCoy.* 



*The two descriptions are given here for comparison. 



M. lens, McCoy. 



'• Corallum formingf lenticular masses, averaging lo lines in diameter, and one and 

 one-half lines thick in the middle, gradually thinning to the edge ; base slightlv con- 

 cave. with small concentric wrinkles ; upper surface evenly convex ; clusters of larger 

 cells rounded, flat, or slightly concave, about one line in diameter, and usually n little 

 more than their diameter apart (averaging from 16 to 20 cells between one centre and 

 another); smaller tubes averaging S in one line, larger tubes of the clusters averaging 4 

 or 5 in one line ; two inter-diaphragmal spaces equal the diameter of the tubes ; ap- 

 parently 2 irregular close rows of connecting pores on each face of each tube (?)" Mc- 

 Coy, quoted by Hd. and H., as above. 



Fistulipora lens, Whiif. 



" Corallum growing in small, discoid or plano-convex, button-shaped bodies, which 

 appear to have commenced iheir growth on a fragment ot shell or other substance, and 

 afterward become free ; discs varying in size from )^ or less to nearly % of an inch in 

 diameter; under surface more or less concave, not usually possessing an epitheca, but 

 presenting a fine, radially striate surface, from the exposure of the cell tubes ; cells 

 radiating from an imaginary centre, and forming on the upper surface of the disc ex- 



