NIAGARA GROITP. 



153 



544. 6. TREMATOPORA SOLIDA (n. 5^.)- 



Pl. XL A. Fig. 6 (J, 6, e. 



Stems bifurcating or irregularly ramose ; coralla solid, tubular cells closely arranged ; aper- 

 tures oval or subangular from compression, margined by an even calicle. 



This species in its surface aspect has the character of a membranaceous coral of the Flustra 

 tribe, spread over a solid substance. It is only by very careful examination that tubular cells 

 can be traced to the centre of the stems, so completely solid are all the specimens examined. 

 The character of the intercellular spaces, if any exist, has not been ascertained. 



Fig. 6 a. A fragment of a solid stem, spreading and slightly flattened above. 



Fig. 6 6. A fragment of a bifurcating stem. 



Fig. 6 c. An enlargement of the surface, showing form and arrangement of the cells. 



Position and locality. In the Niagara shale at Lockport : extremely rare. 



{Collection of Col. Jewett.) 



545. 7. TREMATOPORA STRIATA («.*p.). 



Pl. XL A. Fig. 1 a - d, and 8 a, b. 



Compare Ceriopora granulosa, Goldfuss, Petrefacta, pag. 217, tab. Ixiv, fig. 13. 



— — Lonsdale : Mdrchison, Sil. System, pag. 680, pl. 15, fig. 29. 



Coral expanded at the base, strongly striated ; branches slender, cylindrical, scarcely ta- 

 pering ; openings of the cells oblong oval, distant from each other about the width of the 

 aperture ; space between the aperture with a continuous groove. 



This coral is a very slender species, occuring usually in small fragments. It is readily dis- 

 tinguished from all the preceding species by its oblong elliptical apertures, which are not 

 elosely arranged. The spaces between the openings appear sometimes striated in a longitudinal 

 direction, and, in more perfect specimens, sometimes slightly crenulated in the transverse 

 direction. 



This species has considerable resemblance to Ceriopnra granulosa cited above, and may 

 perhaps prove to be identical with it. 



Fig. 7 a. The base or attached portion of an individual of this species, having two diverging 



branches. 

 Fig. 7 b. The same enlarged, showing the form of the apertures of the cells and the strongly 



striated base. 

 Fig. 7 c. A small fragment of the same species. 

 Fig. 7 d. The surface of 7 c enlarged. 



A transverse section of the stem of this species shows nothing peculiar ; the cellg 

 extend to the centre, and the intermediate spaces appear to be solid. 



In the specimen fig. 7 a, b, the apertures of the cells below the branches open 

 downward or towards the base of the specimen, as shown in some degree upon the 

 [ Pal.eontology — Vol. II.] 20 



