328 



MOLLUSCOIDEA— BRYOZOA 



PHYLÜM V 



Goeloclema Ulr. (Fig. 463). Hollow branclies, lined internally with a striated 

 epitheca. Zoojcia as in Geramoporella, biit witli thicker walls. Ordovician and 

 Silurian. 



Grejpi'pora Ulr. (Figs. 461, d; 464). Mesopores almost entirely restricted to tlie 



FiC!. 463. 



Goeloclema tren- 

 tonensis Ulr, 

 Trentou ; Minne- 

 sota. Two frag- 

 ments, ^/s, and 

 one 6/j. 



Fig. 464. 







Crepipora perampla Ulrich. Lower Trenton ; Minnesota. A, Vertical 

 section. B, Transverse section, 7/j. c, Same, i'i/x, showing lunaria. D, Sur- 

 face of C..-simulans Ulrich, 9/i (after Ulrich). 



maculae, wliich are distributed over the surface as niinutely poroiis elevations or 

 depressions. Apertiires very slightly oblique, angiilar or sub-pyriform. Liinarium 

 well-defined in perfect specimens, best shown in tangential sections. Ovicell-like 

 bodies known in one species. Ordovician and Silurian. * 



Anolotichia Ulr. (Figs. 461, &, c; 465). Zoaria large, ramose or digitale. Lunarium 



AnoloticMaimpolita Ulr. Black River Shales ; Minnesota. A, Surface, 

 6/i. B, Vertical section, 6/j. c, Tangential section, 12/^^ showing tiibes 

 of lunarium. IJ, Tangential section of A. jmiderom Ulr., from the 

 Richmond formation at Wilmington, Hl., showing numerous lunarial 

 tubes (after Ulrich). 



sligbtly elevated at tlie surface, traversed internally l:)y 

 two to six minute, vertical, closely tabulated tubes. 

 Mural communication j)ores present. Ordovician and 

 Silurian. 



Ceramophylla Ulr. (Fig. 466). Like Ceranioporella 

 but zoarium is bifoliate, Ordovician. 



Favositella Ether. and Foord {Bythotrypa Ulr.) (Fig. 

 open at the surface, forming interiorly a very loose vesicular tissue. 

 by communication pores. Ordovician and Silurian. 



Ghiloporella Ulr. Ordovician. 



Scenellopora Ulr. Zoaria simple, pedunculate ; under surface witli an epitheca 

 the Upper slightly concave and celluliferous. Zocccia with slightly ol)lique, sub- 

 circular apertures, radially arranged on the summits of low ridges. Ordovician. 



Fig. 466. 



Ceramophylla frondosa Ulr. Black 

 River Shales; Minnesota. A, Zoa- 

 rium, 2/3. B^ Surface of same, ß/j. 

 6', Two zowcia of a tangential sec- 

 tion, 12/1. D, Right half of a verti- 

 cal section, 12/j (after Ulrich). 



467). 



Mesopores numerous, 

 Walls pierced 



