86 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.83 



within the coraUum near the edges of the calice. Dissepiments 

 absent. 



Genotype. — Paracycloseris elizabethae, new species, from the Upper 

 Cretaceous of Jamaica. 



Remarks. — The septal arrangement of this form is distinctive and 

 much the same as that of many species of Fung la {Cyclose7is-iorin) . 

 The septal structure is no less distinctive — the septa of the lower 

 cycles are very similar to the laminar septa of the Agariciids except 

 for the large teeth, which are of a type more often found in the 

 Fungiids. The relationship with the Anabaciidae is shown in the 

 structure of the septa of the higher cycles — the trabeculate-fenes- 

 trate or latticework arrangement of the trabeculae characteristic of 

 Anahacia and Microsolena. The genus is not, however, closely re- 

 lated to any of the simple genera of this family, except Gyclolites, 

 from which it is distinguished by the presence of a well-developed 

 columella and less perforate, uniting septa. Anahacia lacks an epi- 

 theca and a columella, as does also Trochoplegma. Trocharaea has 

 a parietal columella but no epitheca. 



This form may be intermediate between the Mesozoic Cj^clolitids 

 and the modern Fungiids, possessing as it does many of the char- 

 acters of both Gyclolites and Cyoloseris. 



PARACYCLOSERIS ELIZABETHAE, new species 



Plate 3, Figukes 5-10 ; Plate 5, Figures 1, 2 



Description. — Corallum simple, free, circular in outline, flat or 

 convex on the base, convex or concavo-convex above, with a shallow 

 elliptical fossette in the more mature specimens. The lower sur- 

 face is covered by a stout, concentrically wrinkled epitheca, to the 

 central point of which, in the smaller specimen, is attached a foram- 

 inifer. The septa are numerous, upwardly arched, uniting, mainly 

 imperforate with the upper margin dentate, laterally spinulose or 

 granulate. There are six complete cycles and part of the seventh. 

 Those of the first two cycles are equal, much thicker than the rest, 

 extending to the columella, their upper edges set with coarse, lacerate, 

 multitrabeculate teeth, which increase in size toward the center. 

 The septa of the third cycle, while prominent, are much smaller 

 than those of the first two, their upper edges being set with smaller 

 teeth, but they extend to the columella. The arrangement of the 

 remaining cycles is distinctive. The septa of the fourth cycle, in- 

 stead of being inwardly fused to those of the third^ are fused to 

 the septa of the -fifth cycle, which are nearest the primaries and 

 secondaries, and the remaining septa of the fifth cycle join those 

 of the fourth near the latter's junction with the first set of septa 



