﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 501 



Paratypes. —'^os. 3250676, U.S.N.M. 



Apparently the specimens from Yumurl gorge lived in deeper or 

 quieter water than those from Baracoa, for the differences are of the 

 kind incident to such differences in ecologic conditions. The speci- 

 mens of StylopJwra granvlata from the Yumuri gorge are decidedly 

 more attenuate than those from Baracoa; and the specimens referred 

 to Madracis mirabilis are very, slender and fragile. 



PORITES DOUVILLEI, new species. 



Plate 149, figs. 2, 2a; plate 151, figs. 1, la. 



Corallum composed of compressed, more or less coalescent branches. 

 Plate 151, figure 1, represents a part of a corallum 60 mm. long, 

 15 mm. in maximum thickness, and 40 mm. wide; the specimen, 

 represented by figure 2 of plate 149, is 35.5 mm. long and 11 mm., 

 in maximum thickness. 



Calices shallow, polygonal, 1.25 to 2 mm. in diameter, 1.5 mm. 

 probably about an average; separated by usuall}^ continuous, straight, 

 membraniform walls, along the top of which are a few mural denticles 

 corresponding to the outer ends of the septa; where the septa are 

 distally forked there may be a denticle for each fork. 



Septa forming four lateral pairs, tvro on each side of the plane of 

 symmetry, a solitary directive, and a ventral triplet with the inner 

 ends of its members free from each other. A ring of tliickish septal 

 granules is detaclied from the wall, standing about half way between 

 it and the palar ring; the outer ends of a number of septa fork 

 between the septal granule and the wall. Pali vrell-developed, 

 formula complete or suppressed on one or more members of the 

 triplets, suggestions of trident formation in some calices. S3niapti- 

 culae in two rings, the outer corresponds in position with the septal 

 granules and is usually incomplete, the inner is the palar synapticular 

 ring and normally is complete. 



Columella tangle consists of a central tubercle joined by radii to 

 the pali. 



Locality and geologic occurrence. — Canal Zone, station 6016, quarry 

 in the Emperador limestone. Empire, collected by T. W. Vaughan 

 and D. F. MacDonald. 



Coty pes. —C&t. No. 325106 (2 specimens), U.S.N.M. 



PORITES TOULAI, new species. 



Plate 150, figs. 1, la, 2, 3, 4. 



Corallum composed of elongate, rather slender, subterete, or only 

 slightly compressed branches. The following measurements of 

 broken branches indicate the shape and size. 



