DESCKIPTIONS OF SPECIES. 125 



of a branch is subquadraugular, the angles rounded. The greater diameter 

 of a branch is at right angles to the plane containing the calicos. Costse 

 not prominent and confined to a small area just below the outer edges of 

 the calices. Coenenchymal surface almost devoid of ornamentation ; a few 

 irregular, flexuous striae. Distance between calices usually about 5 mm. 

 Calices of two kinds, (1) not prominent, and (2) very prominent, the 

 max'gin of the most elevated standing 3.5 mm. above coenenchyma. Those 

 calices produced by the alternate l^udding are usually not prominent, while 

 those produced by budding from these are frequentlj^ very elongate. The 

 calices are nearly circular, and range in diameter from 1.3 to 2 mm.; very 

 deep — one has a depth of 3 mm. 



Septa in six systems, three cycles ; those of the first and some members of 

 the second cycle have slightly exsert margins. The sides of the septa are 

 gi'anulate, and their margins show minute dentations. Columella distinct, 

 deep down in the calices, spongy, and rather poorly developed. 

 Localities. — Natchitochcs, Louisiana; San Augustine, Texas. 



Geologic occurrence. LoWOr ClaibomC. 



Types. — United States National Museum. 



This is another species that closely resembles a sjiecies from the Lower 

 Oligocene of Jekaterinoslaw. The species with which it has apparent affini- 

 ties is described by Sokolow as Diplohelia sp.^ About the only dift'erence 

 found between the foi-ms, after an examination of Dr. Sokolow's types, was 

 that the calices of the Russian species are closer together than in the species 

 from Natchitoches, Louisiana, a difference so slight that the two may per- 

 haps be placed in the same species. 



Geuus CCELOHELIA gen. nov. 



Budding dichotomous, alternate, occasionally double. Corallum evi- 

 dently dendroid. Coenenchyma compact. Calices rather prominent, dis- 

 posed in two opposite rows. Costse exist only just below the margins of 

 the calices and are insignificant. The remainder of the outer surface of 

 the corallum shows no ornamentation; if it possesses imj, there are only 

 minute granulations. The septa are scarcely exsert at all ; in three cycles 

 of six systems; thicker at the wall. The margins show minute transverse 



'Die unteroligociine Faun.a der Glaiikoiiitsande bei der Eisenbaliuhriicke von Jekaterinoslaw: 

 M^m. du Comitc Geologique (Russia), 18!tl, pp. 99-100, fig. 12 (iu text), pi. ii, figs, la-lf. 



