GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 341 



Specimen No. 1. — Small branch, 16 mm. long, diameter of lower 

 end 4 mm.; upper end flattened, bifurcating, greater diameter 5.5 

 mm., lesser 3 mm. 



Diameter of calices very slightly less than 1 mm., separated by 

 about the same width of coenenchyma. The margin is usually a very 

 slightly elevated rim without an elevated lip around which are 12 to 

 18 small costae. In a few instances the costae continue from one 

 calice to the next, but usually the intercalicular coenenchymal sur 

 face is merely granulate. There are from two to six indefinite zones 

 or wavy lines of granulations between two calices. The granula- 

 tions are subcorneal, round-pointed. Limits of zooids sometimes 

 faintly indicated by a slightly raised granulated line. Calices mod- 

 erately deep. Six principal septa, the second cycle represented by 

 small short septa, variable number of rudimentary members of the 

 third. The upper margins are slightly exsert. 



Columella does not reach to level of calicular margin, sharp- 

 pointed. 



Specimen No. 2. — A small somewhat compressed, broken branch, 

 16 mm. long; greater diameter of lower end, 6.5 mm., lesser, 5 mm.; 

 greater diameter of upper end, 6 mm., of lesser, 4 mm. Diameter of 

 calices very slightly more than 1 mm. Width of intervening coenen- 

 chyma averages about' the same as the diameter of the calices. 

 Calicular rim a little elevated, and slightly swollen around the base. 



Costae longer than in No. 1. Granulations about the same in both 

 specimens. Elevated line between zooids usually distinct. 



There is in this collection a third specimen which is probably only 

 a variation of the same species. It is a fragment of a branch 14 mm. 

 long. The diameter of the calices is about 0.75 mm. ; the calicular 

 rims are not elevated but usually tend to be depressed. The coenen- 

 chymal surface is very densely and minutely granulate. The limits of 

 adjoining zooids are indicated either by a very faint raised or by an 

 impressed line. 



Localities and geologic occurrence. — Besides occurring in the Bowderi 

 marl of Jamaica, Stylophora granulata is also found in Cuba at sta- 

 tions 3476, Baracoa, and 3461, gorge of Yumuri River, Matanzas y 

 collected by T. W. Vaughan. 



Santo Domingo, station 7781, Rio Cana, zone H, collected by Miss 

 C. J. Maury. 



STYLOPHORA CANALIS. new species. 



Plate 76, figs. 2, 2a. 



Corallum of type, a small, nodular mass, 42 mm. long, 23 mm. tall, 

 and from 10 to 14 mm. thick (see pi. 76, fig. 2, for view, natural size, 

 of the upper surface). 



