PROUT—-BRYOZOA, 4TH SERIES. 581 
Fenestrules long, oval, but sometimes quadrangular, about 
as broad as the large longitudinal rays. 
Chalices in lines alternately distributed with calcareous 
raised lips when perfect common to the chalice openings, 
which are sometimes depressed at certain points, or elevated 
y the expansion of the cells forming the substance of the 
longitudinal rays; four to five lines of chalices on each ray, 
mostly dextral; about fifteen to twenty to each oscule, with 
no interjacent lines of very minute pores between them; 
when the longitudinal rays are worn they appear minutely 
tubular striate. 
Reverse long-tuberculate, anfractuous, with occasional small 
res 
Comparisons—This very large and graceful species of Po- 
lypora is allied somewhat in character to the Retepora laxa, 
Phillip (Polypora, McCoy; Gorgonia ripisteria, Gold. VIL, 
Fig. 2), but differs from it in being much larger in branch- 
ing more regularly, in having no interjacent lines of pores be- 
tween the chalices, and in the long ovate form of its oscules. 
Geological position and Locality.— Second Archimedes 
Limestone, Warsaw, Ill. Illinois State Collection, No. 14, 
