2l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



interporiferous zones only slightly wider than poriferous, not taper- 

 ing distally; poriferous zones wide, tapering distally, with greatest 

 width between one-third and one-half distance from apical system 

 to end of petal ; pores conjugate, outer pore more elongated trans- 

 versely than inner; petals I and V slightly longer than other petals. 



Adoral interambulacra. — Plates large, alternating; single plate at 

 peristome. 



Periproct. — Supramarginal, transverse, groove extending from 

 opening to posterior margin, adapical surface overhanging opening. 



Peristome. — Anterior, pentagonal, higher than wide. 



Floscelle. — Bourrelets strongly developed (pi. 41, fig. 5), each 

 bourrelet highly inflated, triangular; phyllodes broad (text fig. 177), 

 single pored, pores arranged in two series in each half-ambulacrum : 

 seven to nine in each outer series, three to four in each inner. Buccal 

 pores present; sphaeridia in two rows in median of each phyllode. 



Tuherculation. — Tubercles on adoral surface much larger than on 

 adapical; deeply scrobiculate, with large high boss located anteriorly 

 in each scrobicule; mamelon very small, perforated. Deep, irregu- 

 larly shaped pits in adoral interambulacra, many in naked median 

 area in interambulacrum 5, a few in ambulacrum III. 



Occurrence. — Middle Eocene, Santee limestone of North and South 

 Carolina. 



Location of type specimen. — Unknown. Cooke (1959, p. 64) sug- 

 gests that it might be in the Charleston Museum, Charleston, S. C. 



Remarks. — I agree with Lambert and Thiery (1921, p. 365), Mor- 

 tensen (1948, p. 252), and Cooke (1959, p. 63) in considering 

 Ravenclia a synonym of Eurhodia. The type species of both genera 

 have the same elongate, low shape, with supramarginal transverse 

 periproct, high peristome, and strikingly similar floscelle. They differ 

 only in that E. morrisi is more inflated, has wider petals, and has 

 smaller and fewer pits on the adoral surface. 



Genus STUDERIA Duncan 



Stiideria Duncan, 1891. Journ. Linn. Soc. (Zoo!.), vol. 23, p. 185. Type species 



by monotypy, Catopygiis elcgans Laube. 

 Synonyms: Hypselolampas Clark; Phaleropygus De Loriol; Tristomanthus 



Bittner. 



GENERIC DESCRIPTION 



Small to medium, elongate, smoothly rounded anterior margin, 

 pointed or slightly truncated posterior, adorally depressed around 

 peristome, moderately inflated; apical system anterior, monobasal. 



I 



