448 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



summits, 5 mm. ; some oblong calices are as much as 7 mm. long and 

 5 mm. wide. Depth of calices, 1.5 mm. 



Septa, number in a calice 5 mm. in diameter, 50 — i. e., 4 complete 

 cycles and 2 quinaries; in a calice 6 mm. long and 4.5 mm. wide, the 

 number is 48, precisely 4 cycles. The usual number of septa is 

 4 complete cycles, with a few quinaries in large calices. Around the 

 calicular margins the septa are subequal in size, the outer ends of the 

 quaternaries being only slightly smaller than those of the members 

 of the lower cycles. The interseptal spaces average slightly wider 

 than the thickness of the septa. Within the calices the primaries 

 and secondaries are only faintly larger than the tertiaries. There is 

 the usual septal fusion of tertiaries to secondaries and quaternaries 

 to tertiaries, but the tertiaries may almost or actually reach the colu- 

 mella area while the quaternaries extend more than half way from 

 the wall to the columella. 



The upper flattened part of the septal margins is beaded ; within a 

 distance of 1 mm., 5 rounded dentations were counted; between the 

 place where the septa drop downward in the calicular fossa and the 

 columella the number of dentations on the long septa is between 8 

 and 10; the total number on the large septa is, therefore, between 13 

 and 15. Synapticulae well developed, rather coarse, as would be 

 expected from the relatively coarse septal trabeculae. 



Columella weakly developed; upper surface papillary, but in many 

 instances crossed by directive septa which meet in the corallite axis. 



Locality and occurrence of type specimen.- — Station 3694, pine woods, 

 Waukulla, Florida, T. W. Vaughan collector; Chattahoochee forma- 

 tion. 



Type.— No. 325187, U.S.N.M. 



The following is a description of a young, encrusting corallum 

 without a locality label, but almost certainly from the "silex" bed at 

 Tampa, Florida, (See pi. 116, fig. 3.) 



The calicular cavities are slightly excavated, between 0.75 and 1 

 mm. deep; separated by intervening flattish areas which are from 1.5 

 to a little more than 2 mm. across and are faintly furrowed where 

 adjacent corallites meet. The corallite wall may usually be recog- 

 nized as a raised thread-like ridge in the intercorallite furrow. Coral- 

 lite diameter from 5 to 6.5 mm. 



Septa in 4 complete cycles with 6 or a few more quinaries in the 

 larger calices. The septal dentations are serrate or rounded, about 

 13 on the long septa. 



Columella with a papillary upper surface, but some calices show 

 considerable stereoplasmic deposit around the papillae with tendency 

 toward the formation of a compact columella. 



A specimen from the " silex " bed at Ballast Point, Tampa, collected 

 by C. W. Cooke, has some calices that duplicate those of the specimen 



