NIAGARA FALLS AND VICINITY 1 65 



Found rarely in the lower Rochester shale^ associated with I c h - 

 thyocrinus and other rare fossils. Niagara sections. Also in 

 the same shale at Lockport (Hall). 



Genus lioclema Ulrich 



[Ety.: XsTo?, smooth; xX^p.a, twig] 



(1882. Cin. soc. nat. hist. Joiir. 5 :i4i, 154) 



Zoarium ramose, lamellar, subglobose or incrusting; surface 

 frequently exhibiting distinct monticules or maculae; zooecia with 

 subcircular or irregularly petaloid apertures, separated by abundant 

 angular mesopores, which in some species are open at the surface, in 

 others closed; diaphragms few in the zooecia^ abundant, sometimes 

 crowded in the mesopores; acanthopores numerous and strong in 

 the typical species^ small and inconspicuous in others. 



Lioclema florida (Hall) (Fig. -^^^-^-^ 



62). Callopora florida ^^I-v/.,^^^*' » ^'^'7f^ 



Hall (1852. Pal. N. Y. 2:146, ^J^'^y^^d\ ' . ■" ^'^ 



pi. 40, fig. 2a-f) '^- '" - ^ ■ ' 



Distinguishing characters. Ex- 

 planate or incrusting habit; tubu- r:--V-.'^^^-A, i'^-; 



lar cells; floriform apertures the / ' / ^ \l 

 margins of which appear as if '^_^-f^ji/A3rV^ iJ^; 



formed of seg^ments of six or ^. „„,. , 



^ Fig. 62 Lioclema florida with side and summit 



seven smaller curves; each ^^gi^ -''-'' ^^'^^'sea,ana two c^iy^es muci. eniargea 



of aperture furnished with spine (acanthopore) ; mesopores angular 

 in perfect specimens. 



Found in the Bryozoa beds of the Rochester shales at Niagara, 



rare. Also at Lockport (Hall). 



Lioclema aspera (Hall) (Fig. 63). 

 ^'^''" Callopora aspera Hall (1852. 



1^ Pal. N. Y. 2:147, pi. 40, fig. 4a-i) 



" "' Distinguishing characters. Stems 



solid or hollow cylinders, often also 

 incrusting other bodies in broad, 

 explanate or foliate expansions; 



Fig. 63 Lioclema aspera with enlargements of , , i • i i • • r 



surface clavatc or thickened extremities 01 



stems; circular or slightly oval apertures; finely reticulated inter- 

 spaces; margins of apertures surrounded by minute points (acantho- 



^- ^ i c' 



c 



