80 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



Genus CENTRASTREA d'Orbigny, 1849 



CENTRASTREA HILLI, new species 



Plate 2, Figures 11, 12 



DescH'ption. — Corallum thin, encrusting, 1 to 2 mm thick. The 

 type specimen is 37 mm long and 21 mm wide. The corallites are 

 small, short, and united by septo-costae, which are very short, thick, 

 and rounded, and confluent between calices. The exotheca may fill 

 the costal interspaces and give the appearance of a thick corallite 

 wail when the specimen is worn. The calices are shallow, with an 

 average diameter of 0.75 mm and a distance of 0.7 to 1 mm between 

 centers. The septa are 12 in number, thick, laminar, and arranged 

 in two cycles, the first of which reaches the center and joins the 

 columella. They are much thickened near the calicular margins, and 

 are united by a few synapticulae and well-developed endotheca. The 

 columella is styliform, not prominent in the calices, and free w^ithin 

 the corallites. 



ry/ye.— U.S.N.M. no. 74492. 



Occurrence. — From a locality near Catadupa, Jamaica (Trech- 

 mann collection). 



Remarks. — The single specimen upon which the foregoing descrip- 

 tion is based is a much-worn fragment, and the determination of 

 the structure is very difficult. 



This species is distinguished from other Upper Cretaceous species 

 of the genus by the very small, close-set calices, and it seems to be 

 nearer to the Neocomian species C. microphyJlia d'Orbigny figured 

 by de Fromentel (1887, pi. 185, fig. 2). In that species, however^ 

 the septa number 16, octamerally arranged. 



VAUGHANOSERIS, new genus 



Generic diagnosis. — Corallum simple, free, low, and depressed- 

 conical in shape, with a shallow circular or ellif)tical calice having a 

 deep, elongate central columellar fossette. Septa laminar, imper- 

 forate, not uniting, lightly dentate on their upper margins, and lat- 

 erally granulate. Wall indistinct, formed by synapticulae and endo- 

 theca, perforate. Septo-costae thin, beaded on their edges, united by 

 exotheca and some synapticulae, covered by a very thin, easily eroded 

 epitheca. Columella spongy, essential. Endotheca present. Syn- 

 apticulae present, mostly near the wall. 



Genotype. — V aughanoseris cafadupensis, new species, from the 

 Upper Cretaceous near Catadupa, Jamaica. 



Remarks. — Specimens of this genus, which groups with the Agari- 

 ciidae, look very much like young specimens of Antlllop/njJlJa, but 

 the perforate w^all and presence of S5aiapticulae are indicative of its 



