KENTUCKY GEOLOGICAL SURVEY. 45 



Occurrence : A very common form in the Winchester group. 

 Specimens were collected from Lexington, Winchester, Pleasant 

 Valley, Lair arid other points. The Kentucky examples form 

 wider fronds on the whole than the Tennessee forms, upon 

 which this species or variety is based, but seem to differ in no 

 essential particular. The Tennessee forms are stated to occur 

 at the top of the Bigby limestone at Columbia, Tenn., and in 

 the shaly parts of the Cat hey s limestone. 



HOMOTRYPELLA NORWOODI N. SP. 

 Plate 1, figs. 9-11. 



Zoarium -ramose, branching at variable intervals; consisting 

 of rounded or compressed branches from 3 to 6 mm. thick and 

 from 4 to 12 mm. wide. Surface with small, conical monticules, 

 about one-half mm. in diameter at their bases, and 2 mm. or 

 somewhat less apart measuring from summit to summit. Aper- 

 tures subpolygonal, all of about the same size, from 12 to 11 In 

 2 mm., often indented by the numerous small acanthopores. 

 No mesopores detected. Zooecia with thin, somewhat flexuous 

 walls, and rather distant diaphragms in the immature region; 

 they bend rather abruptly to the mature region, where they have 

 their walls lined by a linear series of small, overlapping cysti- 

 phragms. Tn this region also diaphragms are from 2 to 4 times 

 their diameter apart. 



Occurrence: Occurs abundantly in the Winchester group 

 near Pleasant Valley, in Carlisle county. The specific name 

 is given in honor of Professor Charles J. Norwood, Director of 

 the Kentucky Geological Survey. 



HETEROTRYPA PARVTJLIPORA ULRICH AND BASSLER. 



Plate 1. fig. 12. 



Heterotrypa parvulipora Ulrioh and Bassler. Hayes and Ulrich, Geol. Atlas 

 of U. S., Columbia folio, no. 95, Illustration sheet, fig. 26, 1903. 



Heterotrypa parvulipora n. sp. Ulrich. and Bassler, Smithsonian Miscel- 

 laneous Collections, vol. 47, p. 26, pi. xi, 4-6, 1904. 



Zoarium forming large, flabellate expansions from 10 to 15 



