GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 479 



MADREPORARIA PERFORATA. 

 Family EUPSAMMIIDAE Milne Edwards and Haime. 



Genus BALANOPHYLLIA Searles Wood. 



1844. Balanophyllia Searles Wood, Ann. and Mag. Nat. Hist., vol. 13, p. 11. 

 Type-species. — Balanophyllia caly cuius Searles Wood. 



BALANOPHYLLIA PITTIERI, new species. 



Plate 139, figs. 1, la, 16, 2, 2a. 



Corallum compressed-comute in form. The smaller of the two 

 cotypes is 32 mm. long; greater diameter of calice, 4 mm.; lesser 

 diameter of calice, 8.5 mm. (See pi. 139, figs. 1, la, lb.) The larger 

 cotype has both the lower and upper ends broken. It is 41 mm. long; 

 greater diameter of lower end, 9.5 mm.; lesser diameter, about 7 mm.; 

 greater diameter of upper end, 20.5 mm.; lesser diameter, 13 mm. 

 (See pi. 139, figs. 2, 2a.) 



Wall perforate between the costae, less perforate along the costae; 

 ^becomes secondarily thickened; the interseptal loculi near the base are 

 almost solidly filled. There is some pellicular epitheca, which may 

 reach to within 3 mm. of the calicular edge. Costae relatively wide, 

 with narrow interspaces, subequal, every fourth may be somewhat 

 the more prominent where there are four cycles of septa; in general 

 the costae corresponding to the primary and secondary septa are the 

 more conspicuous. In profile they are flat or faintly carinate; about 

 three ill-defined rows of granulations along them, or there are irregu- 

 larly scattered granulations; where the costae are slightly carinate 

 the median row is the more prominent. 



Septa with typical balanophylliid arrangement; in the smaller co- 

 type four complete cycles and a few quinaries; in the larger cotype, 

 four complete cycles and many quinaries, a total of about 78 septa. 

 Paliform lobes appear well developed before the secondaries. 



Columella well developed, elongate, vesicular, protuberant in the 

 bottom of the calice. 



Locality and geologic occurrence. — Costa Rica, "Colline en demoli- 

 tion," Limon, No. 618, H. Pittier collection. Station 6249, Hospital 

 Point, Bocas del Toro, collected by D. F. MacDonald. The horizon 

 is about that of the Bowden marl. 



Cotypes.— Nos. 325014, U.S.N.M. 



Family ACROPORIDAE Verrill. 



Genus ACROPORA Oken. 



1815'. Acropora Oken (part), Lehrb. Naturg., Th. 3, Abth. 1, p. 66. 



1902. Acropora Verrill, Conn. Acad. Arts and Sci. Trans., vol: 11, pp. 164, 208 



(with synonymy). 

 1918. Acropora Vaughan, Carnegie Inst. Washington Pub. 213, p. 159. 



Type-species. — Millepora murica ta Linnaeus, s. s. = Madrepora cervi- 

 cornis Lamarck. 



