478 PALEONTOLOGY OF ILLINOIS. 



nent, about six of the intermacular apertures in two mm. Zo- 

 cecia with thin walls and diaphragms about two diameters 

 apart. Vesicles rather large but irregular in shape and size, 

 rarely in more than a single series between the zocecia. 



This fine species is distinguished from all Devonian species of 

 the genus by the larger and decidedly stellate maculae. These 

 lend the species considerable resemblance to F. asterhi Prout, 

 from the Keokuk group. In other respects, however they are 

 quite distinct. 



Position and locality: Hamilton group, Buffalo, Iowa. 



FlSTULIPORA COLLINA UMch. 

 PI. XL VII, Fig. fr-eb, and PL XL VIII, Fig. 5-5a. 



Zoarium a circular expansion, five or more cm. in width and 

 one to three mm. in thickness; a wrinkled epitheca upon the 

 lower side. Surface with solid, more or less prominent, elon- 

 gated maculae or monticules, set in cross rows, their summits 

 about four mm. apart. Zooecial apertures arranged in some- 

 what concentric rows about the monticules, diminishing very 

 slightly in size as they recede from the monticules; sub-oval or 

 circular in shape, averaging 0.22 mm. but varying from 0. 1 7 

 to 0.27 in diameter, about one-half their diameter apart, about 

 eight in three mm. Apertures, so far as observed, Avithout a 

 distinct peristome, the lunarium too being generally obsolete, 

 but occasionally the apertures appear somewhat oblique on 

 account of a slight prominence of the posterior margin. In thin 

 sections the zocecial tubes are seen to contain a small number 

 of diaphragms, their walls being thin, the lunarium unrecog- 

 nizable, the vesicles comparatively small, of nearly uniform size, 

 but varying from one-third to two-thirds the size of the zooecia, 

 moderately shallow, angular, usually in only a single series be- 

 tween the zooezia, though a double row is commonly present 

 between those which open upon the slopes of the monticules. 

 All the walls have a minutely granular or intermittent appear- 

 ance. 



In some respects this species resembles F. communis and F. 

 monticulata,, two common species at Buffalo, Iowa, which are 

 described in this work as new. The absence of a complete peris- 

 tome and smaller vesicles separate F. collinfi from both, while 



