GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 489 



intercalicular reticulum, but it usually does not well up and form 

 peaks, ridges, and crests between the calices. 



Septa of the normal gonioporid number and arrangement, outer 

 parts thick and subequal, all relatively narrow in their upper parts, 

 and either fall steeply or slope to the level of the large columella 

 tangle, which is joined by the primaries and secondaries and the ter- 

 tiaries fuse to the secondaries near it. Usually 3 or 4 teeth on the 

 margins. Paliform lobes not greatly developed. 



Columella tangle large, about 1.5 mm. in diameter, more than one- 

 third the diameter of the calice ; its upper surface forms the flattish 

 or gently concave bottom of the calices. 



Localities and geologic Tiorizon. — Canal Zone, stations 6015 and 6016, 

 quarries in the Emperador limestone, Empire, T. W. Vaughan and 

 D. F. MacDonald, collectors. 



Type.— Figured specimen No. 325058, U.S.N.M. 



Paraty pes— No. 325057, U.S.N.M. 



GONIOPORA PANAMENSIS, new species. 



Plate 142, figs. 2, 2a, 26. 



Corallum forms thick plates, which may be more than 17 cm. wide 

 and as much as 5 cm. thick in the center, thin on the edges. Growth 

 form similar to that of Goniopora liilli. 



Calices large, but irregular in size and distribution, because of the 

 large development of intercorallite reticulum, which in some areas 

 wells upward and forms nipple-shaped peaks in the angles between 

 the entirely circumscribed calices or forms ridges with calices on each 

 side. The diameter of the calices ranges from 2.5 to 3.5 mm.; the 

 intervening walls or ridges range up to 2.5 mm. thick, their length 

 ranges up to 13 mm., where as many as three calices occur in a single 

 valley, their height ranges up to 2 mm. Costae can be traced across 

 the intercorallite walls and the ridges between calicinal series. 



Septa rather thick, about 24, arrangement indefinite, but according 

 to the gonioporid plan; they slope to the bottom of the calice or their 

 outer part is narrow and falls steeply to the level or the columella 

 tangle, to which the primaries and secondaries extend. Three or 

 four dentations on the margin of each large septum. Paliform knots 

 present, but lobes are not conspicuous. 



Columella tangle well developed, but not so large as in G. liilli. 



Localities and geologic Tiorizon. — Canal Zone, stations 6015 and 6016, 

 quarries in the Emperador limestone, Empire, collected by T. W. 

 Vaughan and D. F. MacDonald. 



Anguilla, station 6894, Crocus Bay, collected by T. W. Vaughan. 



Type.— Figured specimen, No. 325053, U.S.N.M. 



Paraty pes.— No. 325054, U.S.N.M. 



