GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 465 



The series of figures (pi. 131, figs. 1, 2, 3), shows the range in size, 

 shape, depth, and distance apart of the calices. Except A^ery young 

 calices, which may be only 3 mm. in diameter, the range in 

 diameter of these on the specimen represented by plate 129, figure 2, 

 is from 5.5 to 10 mm.; on the specimen represented by plate 130, 

 figure 3, one calice is 12.5 mm. in diameter. In shape the calices 

 are subcircular, elliptical, deformed elliptical, or, where crowded, 

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

 or a little more, but on most specimens the calices are rather shallow. 

 The distance apart ranges from 0.75 mm. to nearly 10 mm. Plate 

 131, figure 3, shows polygonal crowded calices and distant circular 

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

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

 preserved, are beaded, in places interrupted. Unless the calices 

 are very crowded, synapticulae are obvious between the costae. 

 The corallite walls are synapticulate and very perforate (see pi. 131, 

 fig. la). 



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

 large calices. Primaries and secondaries subequal, 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 papillary 

 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 35 specimens. 



Porto Rico, in the Pepino formation, station 3191, 4 miles west of 

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



