﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 479 



MADREPORARIA PERFORATA. 

 Family EUPSAMMIIDAE Milne Edwards and Haime. 



Genus BALANOPHYLLIA Searles Wood. 



1844. Balanophi/Uia Searles Wood, Ann. and Mag. Xat. Hist., vol. 13, p. 11. 

 Tyi)e-species. — BalanophyUia calyculus Searles Wood. 



BALANOPHYLLIA PITTIERI, new species. 



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



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

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

 diameter of calice, S.5 mm. (See pi. 139, figs. 1, la, \l.) 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 peUicuJar epitheca, which may 

 reach to within 3 mm. of the cahcular 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 iU-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 balanophyUiid arrangement; in the smaller co- 

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

 four com])lete 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 occun^ence. — 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. 



Coty^pes.—^oa. 325014, U.S.N.M. 



Family ACROPORIDAE Verrill. 



Genus ACROPORA Oken. 



1815. Acropora Oken (part), Lelu-1>. Xaturo:., Th. 3, Abth. 1, p. 66. 



1902. Aa-opora Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, pp. 164, 20S 



(with synonymy"). 

 1918. Acropora Vaughan, Carnegie Inst. "Wasliington Pub. 213, p. 159. 



Type-species. — MiTleporamuricata^Am\Q,cmi, s. s. == Madrepoixi cervi- 

 ■cornis Lamarck. 



