542 PALEONTOLOGY OF ILLINOIS. 



Dissepiments short, depressed, slender, less than half the width 

 of the branches. Fenestrules 12.5 in 1 cm., each about 0.6 mm. 

 long and 0.25 mm. wide; with the sides indented. Carina very 

 small, with a row of closely set small nodes, and on each side a 

 continuous or interrupted fine line. Zooecia in two ranges. 

 Apertures circular, with well .developed peristome, comparatively 

 large, closely arranged, their diameter or less apart, nineteen 

 or twenty in 5 mm., and regularly three to each fenestrule. A 

 very perfect fragment, obtained since the plates were litho- 

 graphed, shows a peculiar feature not noticed at that time. At 

 the same time it explains the small spots which are shown in 

 sections between the cells. In this specimen a long tubular 

 spine extends from the interspace between the apertures ob- 

 liquely outward and upward. Being very delicate, these spines 

 would readily give way to attrition, but, since I know of its 

 existence, I can detect its base in the other specimens. 



Perfect examples of this interesting species could not be con- 

 founded with any other known. In its ordinary state of pre- 

 servation it resembles F. multispmosa, but differs in having 

 longer fenestrules, larger branches and zooecia apertures, and 

 less angular obverse side to the branches. The last character 

 and the large cell apertures distinguish it from F. compressa,. 

 That species also has larger fenestrules. 



Position and locality: Keokuk group. Rare at King's Moun- 

 tain, Ky. 



FENESTELLA FUNICULA Ulrich. 



PL LI, fig. 6. 



Zoarium an irregular foliar expansion. Branches fourteen or 

 fifteen in 1 cm., comparatively slender, about 0.4 mm. wide, at 

 times a little flexuous, approaching and receding from one 

 another without regularity. Bifurcations at variable though 

 generally rather distant intervals. Dissepiments of unequal 

 length; their width a little more or less than one-half that of 

 the branches. Fenestrules variable in size and shape, from three 

 to four or five times as long as wide, with about five in 10 



