n8 



Cincinnati Society of Natural History. 



approached; tabulae few and chiefly developed in the outer portions ; 

 small corallites developed at the angles of junction of the larger ones, 

 especially in the depressed centres of closely disposed stellate areas 

 which project above the surface as star-shaped elevations ; walls of 

 the small corallites imperfectly developed ; these corallites angular or 

 sub-angular, with numerous tabulae which are sometimes sub-vesicular. 

 (Explor. Eiped., Zoophytes, 1846, p. 537. Nicholson, Pal. Tab. 

 Corals, 1879, pp. 292, 300; Ibid., Genus Montic, 1881, p. 97.) 

 (Stellipora Hall, Pal. of New York, vol. 1, 1847, P- 79-) 



81. — M. (Constellaria) polvstomella Nicholson, 1875. 



Corallum forming palmate or sub-lobate, flattened expansions, or 

 cylindrical stems, varying in height and thickness: generally from one 

 and one-half lines to two lines thick, and composed of corallites 

 radiating from an imaginary central plane in all directions to the sur- 

 face ; the surface with numerous stellate areas, one line apart, consisting 

 of a depressed central space, surrounded by from six to fourteen or 

 more prominent and radiating ridges; corallites of two kinds: the 

 larger oval or circular, occupying the general surface of the corallum, 

 and found especially on the ridges of the star-shaped monticules : 

 smaller ones occupying inter-spaces between the larger ones, and 

 especially the central depressed areas ; tubes thin-walled ; tabulae com- 

 plete and horizontal, few or absent in the axial regions, but increasing 

 in number toward the peripheral region, and at the surface crowded 

 close together. (Pal. of Ohio, vol. 2, 1875, P- 2I 5-) Constellaria 

 antheloidea Nich. Ibid, p. 214 non Hall; C. florida Ulrich, Jour. Cin. 

 Soc. Nat. Hist., vol 6, 1883, p. 267: C. limit 'at is Ulr ■. Ibid, p. 269: 

 C. fischeri\]\r. Ibid, p. 270 : Stellipom limiiaris Ulr. Ibid, vol. 2, 1879, 

 p. 126.) 



Locality. — Cincinnati and numerous places in the vicinity; Mt. 

 Sterling, Ky., Tennessee, Canada, Wisconsin, etc. 



Remarks. — This is a variable and wide-spread species, ranging 

 from the Trenton through the whole of the Cincinnati group. Various 

 attemps have been made to separate forms as species or varieties, but 

 not, to our belief, with any success. Attention should be called to 

 the fact that the species under consideration has been called C. antlie- 

 loidea Hall. It is an error, since this species is parasitic, while poly- 

 stomella is ramose or frondescent : it is also a Trenton form occurring 

 in New York. It may, however, yet be found in our region. 



