Palcoutology of the Cincinnati Group. 55 



Locality. — Cincinnati. 



Remarks. — It is prol)al)k' that Hindia parva, Ulrich, is a 

 synonym for this species. It is descriljed as " free, ^loliular in 

 form, with an even, rounded surface. Specimens vary ])et\veen 

 5 and 10 mm. in diameter, but in a large proportion of the 

 specimens seen the diameter varies but little from 7 or S mm. 



" The radiating canals are a little smaller than in the com- 

 mon Ilii/dia spiicroidalis Duncan, of the Niagara, being as a 

 rule not over 0.27 mm. in diameter." (American Geologist, 

 vol. 3, 1889, p. 244). From this description it is impossible to 

 separate the species from M. grcgaria. Further study may 

 prove it to be distinct. 



2. — M. (?) suBROTUNDUS, U. P. James, 1878. 



Fig. I.— .1/. '?■ .u</uolundus,^a.ra^s. a. One-half of a specimen showing internal 

 structure : about three times natural size. d. Surface features, enlarged. 



" Corallum small, free, subrotund. Cut polished sections in 

 different directions show the corallites [canals] as growing 

 from the center of the corallum [mass] outward in every 

 direction and increased by fission. No tabulae passing 

 through the corallites [canals] apparent; they may be 

 found, however, in other examples. Transverse dissepiments 

 between the corallites [canals] strong. Calices unequal in 

 size, some much larger than others, and an average of about 

 eight in the space of a line. In the cut sections the spaces 

 between the dissepiments appear like rows of minute pores, 

 arranged longitudinally between the corallites [canals]." 

 (The Paleontologist, Sept. 14, 1878, p. 11.) 



Remarks. — The above is the original description of the 

 species, at that time referred to as Cha-tetes siibrottindus, and 

 regarded as a coral. Subsequently (Ibid, June 10, 1881, p. 34,) 

 it was placed under Asty/ospof/gia, and so regarded as a sponge. 

 The so-called calices apparently radiate from what might be 



