206 
PALEONTOLOGY OF NEW YORK. 
each other about 6 mm., the bases nearly in contact; there is an elongate, 
non-celluliferous space at the center occupied by bullae, the cells immediately 
adjacent being slightly larger than the others and much more oblique. 
This species in general appearance approaches very nearly to L. stellata , but 
may be distinguished by the less prominent monticules, the absence of a pro¬ 
nounced central depression, the operculated cell apertures, and the striato- 
bullate inter-apertural surface: in its conspicuous opercula it resembles Fistu- 
lipora serrulata, but may easily be distinguished by its larger and more oblique 
cell apertures, the larger apertures on the monticules and the absence of meso- 
pores: nearly the same features distinguish it from F. umbilicata , F. variopora 
and F. confertipora. 
Formation and localities. Hamilton group, York, Livingston county, and four 
miles south of Le Itoy, Genesee county, N. Y. 
Lichenalia pustulosa, n. sp. 
NOT FIGURED. 
Zoarium consisting of free or incrusting explanate fronds, or of masses formed 
by the superimposition of successive layers of growth; thickness of fronds 
observed' from 2 to 5 mm. Under surface consisting of an epitheca with 
strong, concentric wrinkles and undulations, and fine radiating markings, 
caused by the recumbent portion of the cells. Cells tubular, rectangular or 
slightly oblique to the surface, walls strong, smooth; septa very thin, in some 
of the cells moderately frequent, in others obsolete. Intercellular tissue 
vesiculose, the vesicles near the base are very irregularly disposed, more 
regularly disposed above, having the appearance of septa, transversely 
dividing the intercellular space, or of walled septate tubuli; septa very 
closely disposed, from sixty to ninety in the space of 5 mm. Cell apertures 
circular, diameter about .25 mm., irregularly disposed, sometimes in contact, 
and seldom distant more than one-half the diameter of an aperture. The 
apertures are generally operculated, the opercula consisting of convex or sub- 
conical plates extending entirely across the apertures; sometimes they are 
convex, with a comparatively prominent node at the center. Peristomes 
