140 MADREPORARIA. 



The above are the only known Pontes from these regions which approach the coenen- 

 chymatous forms so common in the Indo-Pacific area, see Vol. V., Table III. And with 

 regard to these it is a matter of doubt whether, except in the case of P. West Indies x. IS, 

 the thick walled calicles are quite normal ; compare for example the observations on 

 P. Bahamas 1. 



B. Forms with three rings of trabeculse. The wall ring is always a zigzag, more or less 

 pronounced. 



P. Cape Verde Islands 1 (PI. I. fig. 2). The wall and septal granules sometimes 



toiiching, and sometimes distinct. This condition may indicate irregular 



perforations in the septa. 

 P. Cape Verde Islands 3 (PI. I. fig. 4). The wall and septal trabeculse quite 



distinct — exact conditions, however, disguised by the irregularity of the skeleton. 

 P. CuroQoa 2. See text, p. 31. 

 P. Barbados % (PI. I. fig. 8), with the wall and septal granules distinct, the latter 



tend to be united into a ring. 

 P. Barbados 3 (PL I., fig. 9). The wall and septal granules distinct where the 



elements are thin, but the two become confused when the elements are thick 



and run together. 

 P. Antigua 1 (1*1. II. fig. 4). The wall and septal granules very close together. 

 P. Antigua 2 (PI. II. fig. 5), with the wall trabeculss raised so as to make a thin 



castellated ring round the calicle. The intracalicular. skeleton somewhat 



confused. 

 P. Antigua 3 (PI. II. fig. 6). The wall and septal granules frequently united into 



small petaloid flakes. The zigzag wall-thread frequently very thin. 

 P. Barbuda 1 (PI. II. fig. 8). The septal granules distinct, wherever skeleton is not 



all melted together (? by post-mortem aqueous corrosion). 

 P. Anguilla 1 (PI. III. fig. 2). The wall and septal trabeculae fairly distinct, but 



the calicle is very small, and the skeletal elements are thick and coarse ; the 



details are only discoverable with a lens. 

 P. St. Thomas 3 (PI. III. fig. 4). The skeleton is open, with finely echinulate 



elements. The trabeculae are only just indicated by slight thickenings in the 



tracery. It appears as if the septal granules and the wall granules were 



distinct, though the details are confused by irregular echinulation. 

 P. St. Thomas 4- (PI- III. fig. R). The three rings complete and distinct in larger 



calicles, but irregular and confused in the smaller. 

 P. Florida % (PI. III. fig. 8). The three circles distinct, the septal trabeculae and 



the wall trabeculae distinct, elements often smooth and sharply defined. 

 P. Florida 5 (PL III. fig. 9). The three circles distinct, but elements coarse, thick, 



and irregular. 

 P. Bermicda 1 (PL IV. fig. 7). The skeleton here open, there with the walls and 



the septal granules tending to run into horizontal flakes. 

 P. Bermuda 2 (PL IV. fig. 8). The points where the trabeculae come to the surface 



confused by echinulation, so that the smooth surface of wall and septal edges 



which look like narrow flakes have saw-like edges. From the sizes of the 



calicles and the length of the septa, we may conclude that the three cii-cles are 



complete and distinct. 



