48 KENTUCKY GEOLOGICAL SURVEY. 



Zoarium ramose, branches cylindrical, dividing dichoto- 

 mously or sometimes otherwise, from 4 to 8 mm. on the average 

 in diameter. Surface smooth. Apertures circular, about 8 in 

 2 mm. Mesopores usually numerous. Acanthopores numer- 

 ous, giving to the surface a spinous appearance when they are 

 preserved. Zocecial tubes thin-walled, with few diaphragms 

 axially; walls thickened and diaphragms numerous peripheral- 

 ly. Mesopores with closely set diaphragms. 



Occurrence : Common in the middle and upper portions of 

 the Eden in northern Kentucky and in Ohio. 



HETEROTRYPA FOERSTEI N. SP. 



Plate 2, fig. 5. 



Zoarium frondescent, from 3 to 7 mm. in thickness, and 15 to 



49 or more mm. in width, and 30 to 60 or more mm. in height. 



' & 



Surface smooth, except for slightly elevated monticules com- 

 posed of apertures scarcely larger than the others. Apertures 

 polygonal, thin-walled, 8 or 9 in 2 mm. Mesopores very few. 

 Acanthopores situated at the angles of junction, not conspicu- 

 ous, and rather less numerous than the apertures. Zooecia with 

 thin walls in the immature region, which are but little thickened 

 in the mature region. Diaphragms wanting in the immature re- 

 gion, from 1 to 2 in the space of a tube diameter in the mature) 

 region. Mesopores developed only in the mature region, with 

 closely set diaphragms. On account of their fewness, mesopores 

 are rarely cut in vertical sections. 



Occurrence: Collected by Dr. Aug. F. Foerste, in whose 

 honor the specific name is given, from the lower Eden exposed 

 in railroad cuts along the Queen & Crescent route near Rogers 

 Gap, in Scott county, Ky. 



BATOSTOMA IMPLICATUM (NICHOLSON). 



Plate 2, fig. 6. 



Monticulipora (Heterotryj-a) implicata. Nicholson, Genus Monticulipora, p. 

 147, pi. ii, 7-7e, 1881. 



Zoarium dendroid, consisting of flattened stems, from 3 to 



