"herr ae a 
American Paleozoic Bryozoa. 265 
under the new name of Constellaria florida. This species had long 
-been current under the name of Stellipora or Constellaria anthe- 
loidea, from which, however, I hold it differs not only specifically but 
generically. My former definition of Stellipora and Constellaria above 
referred to, being deficient in several important particulars, I offer the 
following more complete descriptions. 
STELLIPORA, Hall. ‘ 
Zoaria incrusting, forming thin expansions over foreign bodies. 
Cells of two kinds, true zowecia with subcircular apertures, and some- 
what smaller polygonal interstitial cells. At rather irregular intervals 
the surface exhibits stellate monticules, each of which consists ofa 
more or less depressed central area, from which a variable number of 
equally depressed, narrow, and often bifurcated rays radiate in all 
directions. These rays separate the outer portion of the monticule 
into an equal number of elevated, irregularly wedge-shaped sloping 
ridges, to which the true zocecia are entirely restricted. All the de- 
pressed portions of the monticules, and the inter-monticular spaces are 
solely occupied by interstitial cells, the apertures of which, so far as 
observed, are always closed by an interstitial membrane. In sections 
the true cells are marked by their rounded form, larger size, thicker 
walls, and few horizontal diaphragms. ‘The interstial tubes, with only 
a few exceptions, are always developed from the epithecal membrane, 
from which they proceed, more or less directly, toward the surface. 
They are distinguished from the true zocecia by being polygonal, thin- 
walled, of unequal size, and crossed by more numerous diaphragms. 
Type, S. antheloidea, Hall, from the Trenton limestone of New York. 
CoNSTELLARIA, Dana. 
(Zoophytes, p. 537, 1848.) 
Zoaria growing from a slightly expanded base, into erect fronds, 
or more or less flattened, sometimes anastomosing, branches. Cells of 
two kinds, true zocecia with subcircular apertures, surrounded by a 
slight peristome; and angular thin-walled interstitial cells. At sub- 
recular intervals the surface exhibits apparently solid stellate 
“macule,” that may be more or less elevated above the general plane 
of the surface, or depressed below it. Between the slender and often 
bifurcating rays of the maculum, an equal number of small groups of 
true cells occur, which may be placed on a plane with the surrounding 
surface, or, aS is more commonly the case, be more or less prominently 
