i 2 ae a 2 
270 Cincinnati Society of Natural History. 
Longitudinal sections (Pl. XIV., fig. 5a) show that the tubes follow 
a gently curved course from the axial region of the branch to the 
surface. They are intersected by numerous diaphragms throughout 
their length; the intervals between them gradually diminish from a 
little more than a tube diameter in the axial region, to less than one 
third of a tube diameter in the peripheral region. The interstitial 
tubes are developed quite near the surface, and are crossed by crowded 
horizontal diaphragms, at, approximately, the same level in all the 
tubes of this set. 
This species is clearly distinct, and easily distinguished from C. 
florida and its varieties. The zoarium of C. limitaris being usually of 
more robust growth, and comparatively smooth, the “ maculx” being 
oftener depressed than elevated. The true cells have somewhat thinner 
walls, are larger, and more completelv isolated by the interstitial cells, 
which again are much smaller, and consequently more numerous than 
those of C. florida. Longitudinal sections of the two species are dis- 
tinguished at a glance, by noting the difference in the tabulation of the 
tubes in the axial region, diaphragms being entirely absent in that por- 
tion of the tubes of U. florida, and very remote even in the peripheral 
region, while they are numerous throughout in the true tubes of C. 
limitaris. 
Formation and locality: Cincinnati group. Fragments of eee species 
are not uncommon in the upper portion of the series, at an elevation 
corresponding to a height of from 600 to 700 feet above low water mark 
at Cincinnati, O. These strata are at least 200 feet higher than any 
certainly known to contain C. florida. My best specimens I collected 
near Blanchester, Ohio. . 
CoNSTELLARIA FISCHERI, D. sp. (P. XIV., figs. 6-6e. ) 
Zoarium somewhat irregularly frondescent or palmate, varying in 
thickness from *16 to .25 of an inch, with a height of about two inches. 
Scattered over the entire surface are small, tore or less regularly ar- 
ranged, stellate ‘“‘macule,’” that sometimes are elevated into small ~ 
conical monticules, but more commonly remain on a level with the 
general.plane of the surface. In the transverse series the specimens 
examined show a variation in the number that may be counted in the 
e space of .5 of an inch, of from eight to thirteen, while in the longitud- . 
f inal series from six to ten occur in the same space. On the specimen | 
{ figured the macule are more widely separated than they ure on any, } 
1 other seen. Cells sub-equal, from thirteen to fourteen in the space of 
