GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 493 



Septa thin, formula complete, arrangement typical. Margins with 

 an average of 5 or 6 delicate teeth between the columella and the 

 wall, 8 teeth were counted on each of a few septa. There is no con- 

 spicuous palar crown. 



Columella tangle weakly developed; apparently a central tubercle 

 was present in a number of the calices. 



Locality and geologic occurrence. — Cuba, station 3446, La Cruz 

 marl, first deep cutting east of La Cruz near Santiago, collected by 

 T. W. Vaughan (type). 



Florida, station 6775, White Springs, Alum Bluff formation, col- 

 lected by T. W. Vaughan and C. W. Cooke. 



Type.— No. 325077, U.S.N.M. 



There are two undescribed species of Goniopora that are nearly 

 related to G. jacobiana. One of them is from the Chipola marl mem- 

 ber of Alum Bluff formation, Chipola River, Florida. Its calices are 

 of the same size and its septa are fragile as in G. jacobiana, but the 

 intercorallite reticulum is a more curly mesh-work in which the 

 radial skeletal elements are obscure or are less conspicuous than in 

 G. jacobiana. This difference in the reticulum seems to constitute a 

 valid specific distinction. The other closely related species is from 

 the Bowden marl, Bowden, Jamaica. As the calices of the Bowden 

 specimen average about 2.3 mm. in diameter, they are distinctly 

 smaller than in G. jacobiana. The radial elements are obvious in 

 the intercorallite reticulum, but it is somewhat flaky. The Bowden 

 specimen may belong to G. jacobiana, but with the small amount of 

 material for comparison, it must, for the present be considered 

 distinct. 



In addition to the two species mentioned, there is a somewhat 

 similar species found abundantly in the calcareous marl of Anguilla, 

 where I collected about 50 specimens of it. This species forms 

 columniform or gibbous masses, composed of successive caps. It is 

 not so massive as G. jacobiana, the columns are more slender, and 

 its calices are more excavated. 



The only observed difference between the type of G. jacobiana 

 and the specimen from White Springs, Florida, identified with that 

 species, is that the calices of the White Springs specimen may be 

 somewhat deeper. To refer specimens so similar in habit and struc- 

 tural detail to different species appears unjustifiable. 



GONIOPORA IMPERATORIS, new species. 



Plate 142, figs. 3, 3a. 



Growth form as a compressed, lobate column, 54 mm. tall, 22 mm. 

 thick, 37 mm. wide (excluding a lateral lobe which is about 13 mm. 

 long). 



