BRYOZOA. 477 



FlSTULIPORA MONTICULATA UMch. 

 PL XLVTL fig. 3 3b. PI. XL VIII. fig. 2, 2a. 



Zoarium consisting of more or less compressed hollow branches 

 one to three cm. in width and two and one-half to five mm. in 

 thickness; actual thickness of zoarium less than two mm. Sur- 

 face generally with broad rounded monticules of moderate ele- 

 vation, four or five mm. apart and arranged in diagonal rows. 

 Monticules composed chiefly of vesicles and hence have a sub- 

 solid appearance on the surface. Apertures with thick rounded 

 peristomes, more elevated on one side; somewhat irregular in 

 shape, commonly oval, 0.2 to 0.3 mm. in their greatest dia- 

 meter, about half their diameter apart. Zooecial walls only 

 moderately thin sometimes ring-like, the lunarium distinct, but 

 with the ends scarcely projecting into the zocecial cavity. Ves- 

 icles sub-angular, about two-thirds as large as the zooecia, sel- 

 dom in more than a single row between the zooecia, shallow, 

 often arranged in quite regular vertical series. Diaphragms 

 developed occasionally in the zocecial tubes. Vertical sections 

 indicate that upon the floor of each vesicle there was a cal- 

 careous deposit. 



Typical examples like that represented by fig. 3, are readily 

 distinguished from other species of the genus. When without 

 monticules the species bears some resemblance to F. utricula 

 Rominger, but the absence of spines, which are a characteristic 

 feature of the surface of Rominger s species is sufficient to show 

 their distinctness. 



Position and locality; Hamilton group, Buffalo, Iowa. 



FlSTlLIPCRA ASTRICA UMch. 

 PI. XLVH, fig. 5 5b. PI. XLVm, fig. 3. 



Zoarium consisting of large, hollow, compressed branches, or 

 laminar expansions, several cm. wide, one and one-half to three 

 mm. thick. Surface marked with large, showy, depressed, star- 

 shaped macula 1 , at somewhat variable distances apart, averag- 

 ing six mm. measuring from center to center, forming rows of 

 greater or less regularity. Apertures sub-triangular or, more 

 commonly, pyriform, bidenticulate. with the lunarium pronii- 



