172 



EOCENE AND LOWEE OLIGOCENE CORAL FAUNAS. 



name as applied to the Balanophyllia is not an identification of Morton's 

 '■'■ TnrhinoUa Inauris." 



The following- description is based on seven specimens in the United 

 States National Museiun, and five specimens and two sections in the 

 collection of tlie Academy of Natural Sciences of Philadelphia : 



The corallum possesses two forms; they are either cornute, curved in 

 the plane of the longer transverse axis of the calice, or are straight; 

 occasionally a .specimen may be slightly curved in the plane of the shorter 

 transverse axis. The first-described form of corallum is that figured by 

 Morton. The area of attachment is small. The following gives the meas- 

 urements of a series : 



a Specimen 1 is represented by PI. XIX, fig. 12. It and specimen 2 are in the United States 

 National Museum. Specimen 3 is represented by PI. XIX, fig. 13. It and specimens 3, 4, and 5 are in 

 the Academy of Natural Sciences of Philadelphia. 



The costse are fine, low, granulate, usually not acute; subequal 

 in size, or every fourth one slightly larger than the intervening tlu'ee. 

 The corallum wall, to be sure, is perforate. Apparently, girdling bands or 

 shreds of epitheca are sometimes present. Septa in five complete cycles, 

 with typical Balanophyllid arrangement (see PI. XIX, fig. 14); the mem- 

 bers of the fifth cycle standing next those of the first and second cycles are 

 longer than the other members of the fifth cycle. The upper margins of 

 the first and second cycles considerably elevated; those of the third less so. 

 Calice rather deep. Columella, lax, spongy, not greatly developed. 



Locality. — ((.)f spccimeiis in the United States National Museum) upper 

 part of second bed of Green Sand or lower part of third bed, Williams, 

 near Squankum, New Jersey (Meek and Hay den). The specimens from 

 the Academy of Natural Sciences of Philadelphia bear on the label only 



"N. J." 



Horizon. — Shark River beds, probably about Middle Eocene (Claibornian). 



Types. — United States National Museum; Philadelphia Academy of 

 Natural Sciences. 



