GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 425 



the upper part of the cahce of the type are broken. Wall strong, 

 moderately thick; with coarsely dentate costae just below the 

 calicular edge, lower down covered by thick, finely wrinkled epitheca. 



The number of septa could not be counted with certainty, there 

 are about 200, or approximately 6 cycles. The primaries, secondaries, 

 and tertiaries extend to the columella and are very thick, 1 mm. 

 usual and 2 mm. occasional. The quaternaries are shorter and thin- 

 ner; and the members of the fifth and sixth cycles shorter and thinner 

 than the quaternaries according to cycle. The very thick principal 

 septa with shorter and thinner intermediate septa constitute one of 

 the most striking characteristics of the species. The septal margins 

 are broken but their character can be inferred from the plan of the 

 broken cross section. There are alternate swollen and thinner areas, 

 showing that the septa are composed of compound trabeculae, and had 

 coarsely dentate margins. The bases of some of the teeth were prob- 

 abl}^ as much as 3 mm. in width, but a more usual width was probably 

 between 2 and 2.5 mm. 



The columella is relatively small, it appears to be entirely composed 

 of the fused inner ends of the septa. 



Locality and geologic occurrence. — Nicaragua, Brito formation 

 (upper Eocene), on or near the Pacific coast; collected by C. W. 

 Hayes, for whom the species is named. 



Type.—^o. 325009, U.S.N.M. 



Two other species of SyzygopJiyllia are known from middle America, 

 Syzygopliijllia gregorii (Vaughan) and S. dentata (Duncan). S. gre- 

 gorii was first described from the Bowden marl of Bowden, Jamaica, 

 but also occurs in beds of equivalent age in Santo Domingo. S. 

 dentata, which was described from the Nivaje shale of Santo Domingo, 

 occurs stratigraphically above -S^. gregorii, but in deposits paleonto- 

 logically closely related to the Bowden marl. Of the two species 

 8. liayesi is more like S. gregorii, but its principal septa are thicker 

 and its columella is less developed. Probably the most nearl;^ related 

 species is one collected in the Eocene St. Bartholomew limestone 

 by Prof. P. T. Cleve, but the specimen that I have seen of this is 

 not good enough for positive identification. 



MADREPORARIA FUNGIDA. 

 Family AGARICIIDAE Verrill. 



Genus TROCHOSERIS Milne Edwards and Haime. 



1849. Trochosens MxhUTE, Edwards and Haime, Comptes Rend., vol. 29, p. 72. 

 1905. Trochoseris Vaughan, U. S. Nat. Mus. Proc, vol. 28, p. 384. 



Type-species. — AnthopliyUuTn distortum Michelin. 

 The columella in the type-species is very small, false, and more or 

 less papillary. 



