CORALS AND BRYOZOA. 
179 
Trematopora (Ortiiopora) reticulata, n. sp. 
PLATE LV, FIG. 8; AND PLATE LVI, FIG. 5. 
Zoarium ramose ; bifurcations infrequent; branches 1 mm. in diameter. Cells 
tubular, arising from the center of the branch. Cell apertures oval, length 
.20 mm., width one-half the length, disposed in longitudinal, parallel rows, 
alternating and forming oblique transverse rows, the latter arrangement 
being the most conspicuous. Surface between the ranges of apertures 
elevated, angular, the elevations enclosing the cell apertures in rhomboidal, 
vestibular areas, and having a row of minute granules along the crests and 
prominent spinules at the angles. 
This species in its surface characters very closely resembles Acanthoclema 
scutulatum, but the branches are somewhat larger, the cell apertures more broadly 
oval, and the angular elevations between them are granulose, a feature 
which has not been observed in that species; internally their characters 
are very different: from T. (0.) subquadrata it is distinguished by the closer and 
more regular disposition of the cell apertures and the more prominent nodes at 
the angles of the elevations, the vestibular areas are never polygonal: from 
T. ( 0.) rhombifera it is distinguished by the more broadly oval cell apertures and 
the prominent nodes at the angles of the elevations. 
Formation and locality. Hamilton group, West Hamburg, Erie county, N. Y. 
Trematopora (Ortiiopora) carinata, n. sp. 
PLATE LV, FIG. 2 ; and PLATE LVI, FIG. 3. 
Zoarium ramose; bifurcations infrequent; branches .75 mm. in diameter. 
Cells tubular, arising from the centre of the branch Cell apertures oval, 
length .20 mm., width onerthird the length, disposed in longitudinal, parallel 
rows, alternating and forming obliquely transverse rows, the longitudinal 
arrangement being the most conspicuous. Peristomes obsolete. Longitudinal 
ranges of apertures separated by prominent, rounded ridges, which are 
wider than the apertures. There is a small conical node, and occasionally 
two, in the transverse space between adjacent apertures. 
