44 KENTUCKY GEOLOGICAL SURVEY. 



Apertures circular, thin-walled, about 7 in 2 mm., surrounded 

 by the very numerous openings of mesopores. The interspaces 

 carry a very large number of small acanthopores. Zooecia have 

 a very short, immature region in which very large cystiphragms 

 are developed; they soon proceed at almost right angles to the 

 surface. In the mature region the cystiphragms are smaller 

 and form an interrupted series, and diaphragms are few or want- 

 ing. The mesopores have closely set diaphragms. 



Occurrence: The material from which the description is 

 drawn was collected on the outskirts of Lexington, Ky., from 

 the Winchester group. The specific name is in honor of Pro- 

 fessor Arthur M. Miller. The small size and thin walls of the 

 apertures, the very numerous mesopores, which surround the 

 apertures, and the very numerous, small acanthopores, distin- 

 guish this species from an associated species of Peronopora 

 which has not yet been described. The Peronopora vera from 

 overlying Eden has very much larger cells. 



CONSTELLARIA EMACIATA ULPJCH AND BASSLER. 



Plate 1, figs. 7, 8. 



Constellaria florida var. emaMata Ulrieh and Bassler. Hayes and Ulrica, 

 Geol. Atlas of U. S., Columbia folio, no. 95, Illustration sheet, fig. 30, 1903. 



Constellaria florida var. emaciata n. var. Ulrieh and Bassler, Smithsonian 

 Miscellaneous Collections, vol. 34, 1904, p. 37. 



Zoarium consisting of small fronds, or of rounded or com- 

 pressed branches, about 3 mm. in thickness and from 4 to 7 mm. 

 in breadth, and from 15 to 30 mm. in height. Division occurred 

 at short, irregular intervals, and an entire zoarium consisted 

 of a small clump of closely interwoven narrow branches. The 

 surface is marked by small, stellate maculae, usually well ele- 

 vated, each consisting of from 5 to 8 narrow ridges radiating 

 from a center. Apertures with a narrow, distinctly marked 

 rim. Mesopores very numerous, especially between the stellate 

 maculae. The zorecia have diaphragms about 3 tube diameter 

 apart. The mesopores are closely tabulated. 



