CORALS AND BRYOZOA. 179 



Trematopora (Orthopora) 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 chiiracters very closely resembles Acanthoclema 

 scutulatvm, but the branches are somewhat larger, the cell apertures more broadly 

 oval, and the angular elevations between them are granulose, a feature 

 which h.as 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 hcalilij. Hamilton group. West Hamburg, Erie county, N. Y. 



Trematopora (Orthopora) carinata, n. sp. 



PLATE LV, FIG. i ; and PLATE LVI, FIG. 3. 



Z0ARIU.M namose; bifurcations infrequent; branches .75 mm. in diameter. 

 Cells tubular, arising from the centre of the branch Cell apertures oval, 

 length .20 mm., width one-third 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. 



