328 



MOLLUSCOIDEA— BRYOZOA 



PHYLUM V 



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

 epitheca. Zocecia as in Ceramoporella, Ijut with thicker walls. Ordovician and 

 Silurian. 



Crejnpora Ulr. (Figs. 461, d ; 464). Mesopores almost entirely restricted to the 



Fid. 403. 



Coeloclema tren- 

 tonensis U 1 r. 

 Trenton ; Minne- 

 sota. Two frag- 

 ments, 2/3, and 

 one 6/1. 



i&IS^ 



Fig. 464. ■ 



Crepipora 2^era'>npla Ulricli. Lower Trenton ; Minnesota. A, Vertical 

 section. B, Transverse section, 7/j. c, Same, i4/j, showing lunaria. D, Sur- 

 face of C. simulans Ulrich, S/j (after Ulrich). 



maculae, which are distributed over the surface as minutely porous elevations or 

 depressions. Apertures very slightly oblique, angular or sub-pyriform. Lunarium 

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

 bodies known in one species. Ordovician and Silmian. 



Anolotichia Ulr. (Figs. 461, 6, c ; 465). Zoaria large, ramose or digitate. Lunarium 



Fi(i. 460. 



Anoloticliia impnlita Ulr. Black River Shales ; Minnesota. A, Surface, 

 •i/j. B, Vertical section, 6/1. t', Tangential section, 12/j, showing tubes 

 of lunarium. /*, Tangential section of A. ponderosa Ulr., from the 

 Richmond formation at Wilmington, 111., showing numerous lunarial 

 tubes (after Ulrich). 



slightly elevated at the surface, traversed internally l)y 

 two to six minute, vertical, closely tabulated tubes. 

 Mural communication pores present. Ordovician and 

 Silurian. 



Ceramoplbijlla Ulr. (Fig. '466), 



FKi. 466. 

 Cemmophylla frondosa Ulr 



. Black 

 .4, Zoa- 



Kiver Shales ; Minnesota. 



rium, 2/.j. 



(', Two zoojcia of a tangential sec- 

 j ■■, ri 11 tion, 12/]. i), Right half of a verti- 



Lilke Ueramoporella g^i section, 12/1 (after Ulrich). 



but zoarium is bifoliate. Ordovician. 



Favositella Ether, and Foord {Bythotryfci Ulr.) (Fig. 467). Mesopores numerous, 

 open at the surface, forming interiorly a very loose vesicular tissue. Walls j)ierced 

 by communication pores. Ordovician and Silurian. 



Ghiloporella Vh: Ordovician. 



Scenello'pora Ulr. Zoaria simple, pedunculate ; under surface with an eiiitheca, 

 the uj)per slightly concave and celluliferous. Zocecia with slightly oblique, sub- 

 circular apertures, radially arranged on the summits of low I'idges. Ordovician. 



