﻿GEOLOGY AXD PALEONTOLOGY OF THE CANAL ZONE. 465 



The series of figures (pi. 131, tigs. I, 2, 8), sliows the range in size, 

 shape, depth, and distance apart of the caUces. Exce])t very young 

 cahces, which may he otily 'A mm. in diameter, the range in 

 diameter of tlies(> on the specimen represented hy plate 129. figure 2. 

 is from 5.5 to 10 mm.: on the specimen represented hy i)late loO, 

 figure 8. one cahce is 12.5 mm. in diameter. Tn shape the calices 

 are suhcircular. elUptical, deformed elhptical, or. wliere crowded, 

 polygonal. The depth ranges from superficial to as much as 4.5 mm. 

 or a little more, hut on most spe<"imens the calices are rather shallow 

 The distance apart ranges from 0.75 nun. to neailv 10 nun. Plate 

 131, figure 8, shows polygonal crowded calices and distant circular 

 calices on the same specimen. Costae suhequal or slightly alter- 

 nating, correspond to all septa. Their margins, where perfectly 

 preserved, • are headed, in places interrupted, l^nless the calices 

 are A-ery crowded, synapticulae are ohvious hetween the costae. 

 The corallite walls are synapticulate and very perforate (see pi. 181, 

 fig. la). 



The septa are usually thin, in about 4 cycles, as many as 58 in 

 large calices. Primaries and secondaries suhequal. extend to the 

 columella : tertiaries rather long but usually do not reach the colum- 

 ella; quaternaries, and quinaries where present, are shorter. In 

 many calices some tertiaries fuse to the sides of the secondaries, and 

 the quaternaries may fuse to the sides of the tertiaries: but there is 

 much variation, in some systems there are no septal groups by fusion. 

 The septal arches may be rather wide, the septal edges gradually 

 curving over the calicular rim: or the arches may be narrow, the 

 septal edges falling steeply to near the -level of calicular bottom — 

 both of these conditions occur on the same specimen. Primary and 

 secondary septa appear imperforate, should there be perforations 

 they are rare: higher cycles perforate. Septal faces with carinae and 

 granulations. Margins of larger septa finely beaded : margins of 

 members of higher cycles more conspicuously dentate. Prominent, 

 rather wide, thickish, paliform lobes before the primary and second- 

 ary septa: an outer palar crown before the tertiary septa. 



Columella fairly well developed, trabecular: upper surface papillar}^ 

 in the best preserved calices. 



Synapticulae abundant within the corallite cavities. Endothecal 

 dissepiments also present. 



Asexual reproduction by intercalicular budding. 



Localities and geologic occurrence . — Antigua, in the Antigua forma- 

 tion, at stations 6854, Friar's Hill : 6856, Rifle Butts : 6881 , Willoughby 

 Bay; 6888, one-half mile north of McKinnon's Mill, collected by 

 T. W. Vaughan, a total of about 85 specimens. 



Porto Rico, in the Pepino formation, station 8191, 4 miles west of 

 Lares, Porto Rico, collected bv Robert T. Hill. 



