556 Repoet of the State Geologist. 



angular mesopores, which never present the appearance of vesicu- 

 lar tissue ; tabulae horizontal, few in the cell tubes, numerous in 

 the mesopores." 



Family Favicellidae. 

 This family includes those forms having the cell apertures in a 

 depressed vestibular area, enclosed by angular elevations, and 

 comprised of two groups, in one of which the interapertural sur- 

 face is solid, in the other occupied by angular pits. It includes 

 the genera Favioella and LicHEci^oTBTPA. 



Favioella, Hall. 

 (Pal. K Y., Yol. YI, p. xviii. 1887.) 



Type, Favicella inclusa^ Hall. 



(Plate 24, figs. 15-17.) 



Zoarium consisting of thin, lamellate .expansions, free, or 

 incrusting other objects; cells tubular, cylindrical; for nearly 

 one-half their length parallel and in contact with the epitheca ; 

 then somewhat abruptly bending, continuing almost rectangularly 

 to the former portion, and opening directly outward ; inter- 

 cellular space occupied by vesicles, usually regularly super- 

 imposed, and having the appearance of tabulate mesopores about 

 two-thirds the diameter of the cell tubes, with closely disposed 

 tabulse ; cell apertures circular, irregularly disposed ; peristomes 

 thin, equally elevated. Midway between the cell apertures are 

 comparatively strong, angular ridges, which coalesce and inclose 

 the apertures in pentagonal or hexagonal vestibular areas . The 

 surface between the angular ridges and cell apertures is occupied 

 by minute angular pits, of much less diameter than the vesicles. 

 On the surface at intervals are monticules occupied by pits or 

 vesicles at the center ; the cell apertures immediately surrounding 

 them being larger than those on other portions of the frond. 



Lichenotrypa, Ulrich. 

 (Cont. Amer. Pal., p. 23. 1886.) 

 Type, Lichenotrypa longispina^ Hall, (sp.). 



(Plate23, fig. 7.) 

 Zoarium cbnsisting of thin laminate expansions incrusting 

 other objects. In the earlier stages of growth (which may be 



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