364 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



internal structure, is of the opinion that they are only parts of the basal 

 reticulation of specimens of Syringopora Madurri, Billings. 



Mr. Schuchert also identifies two creeping attached corals that he 

 collected at Bartlett's Mills, with the Aulopora procuinbens of Davis, 

 which is figured on Plate 73 of " Kentucky Fossils Corals." But that 

 species has never been described, and there is nothing to show what its 

 internal structure is like. 



MONILOPORA ANTIQUA. (N. Sp.) 



Plate 48, figs. 1, 2, 3 and 3a. 



Corallum compound, at first attached to and either wholly or partially 

 encircling foreign bodies, but apparently free and ramose ultimately. Most 

 of the specimens that the writer has seen are parasitic on portions of the 

 columns of crinoids, in some cases (as in fig. 1) completely enveloping 

 them, except at the ends, and throwing out corallites in every direction; 

 in others (as in fig. 2) only p irtially attached and spreading out into a 

 thin, nearly flat, sub-circular lateral expansion, with all the corallites 

 springing from its upper surface, and the lower surface consisting of a 

 concentrically wrinkled epitheca. In this state of preservation the 

 corallites are numerous, tubular, or somewhat conical and widening 

 slightly outward, rather short, simple, bifurcate, trifurcate, or twice 

 bifurcate, very unequal in size, the larger ones averaging about four 

 millimetres in diameter at their summits. In two or three fragments, how- 

 ever, the most perfect of which is represented Ijy figure 3, the branches 

 are entirely free, and zigzag, with alternating corallites. In all the 

 specimens the calyces are deep, the septa are almost obsolete and repre- 

 sented only by a faint minute longitudinal grooving of the inner surface 

 of tlie calyx, and the upper or outer edges of the calyces are thin and 

 finely denticulated by the minute longitudinal channelling of the exterior 

 of the summits of the corallites. 



Except upon the basal epitheca of laterally expanded specimens, the 

 whole of the surface is minutely granulo-striate and marked by irregu- 

 larly disposed and very minute granules, tubercles, or low, interrupted 

 longitudinal ridges, with equally minute grooves or channels between 

 them. 



A longitudinal section of a portion of a free branch, which is bifurcate 

 above, shows that the branch is hollow throughout its length, and quite 

 devoid of tabuhe or of funnel-shaped diaphragms. The wall is rather 

 thin, but no thin microscopic sections of any portion of it have yet been 

 made, to show whether its structure is minutely cancellated or not. 



This well-marked species appears to be not uncommon at Thedford, 

 where specimens were collected by Mr. Johnson Pettit in 1868, by the 



