214 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Ambulacra. — Petals well developed, closing distally, wide inter- 

 poriferous zones almost twice width of poriferous zones, both pores 

 of pore pair elongate transversely, outer pore more elongated than 

 inner, pores conjugate ; posterior poriferous zones of petals V and I 

 much narrower than other poriferous zones. 



Periproct. — Supramarginal, large, transverse, slightly overhung, in 

 slight groove. 



Peristome. — Much higher than wide, pentagonal, not depressed, 

 anterior. 



Floscelle. — Bourrelets strongly developed with inflated tips and 

 vertical sides ; phyllodes (text fig. 176) broad, single pored, with 10 

 to 12 pores in each outer series of half-area, 5 to 7 in each iuHer; 

 buccal pores present. 



Tiiherculation. — Tubercles considerably larger adorally than adap- 

 ically; deeply scrobiculate with large, high boss located anteriorly in 

 each scrobicule ; mamelon very small, perforated ; naked median area 

 in interambulacrum 5 and ambulacrum III adorally ; few small, round 

 pits in both areas. 



Occurrence. — Paleocene-Ranikot Series, Petiani, India. 



Location of type specimen. — Geological Survey of India, Calcutta 

 (personal communication from V. R. Khedker). 



Remarks. — This species has hitherto been credited to d'Archiac, 

 1850, p. 248. It is a nomen nudum in this reference and must date 

 from Haime, 1953. 



Synonym of EURHODIA 



Ravenelia McCrady, 1859. Proc. Elliott Soc. Nat. Hist. Charleston, S. C, 

 vol. I, p. 283. Type species by subsequent designation, Lambert and Thiery, 

 1921, p. 365, Pygorhynchus rtigosa Ravenel, 1848. 



DESCRIPTION OF TYPE SPECIES 



EURHODIA RUGOSA (Ravenel) 



Plate 41, figures 1-5 ; text figure 177 



Pygorhynchus rugosus Ravenel, 1848. Echinidae, Recent and fossil, of South 

 Carolina, p. 4, figs. 7, 8. 



Shape. — Medium size, largest specimen 47 mm. long, very elongate, 

 anterior margin rounded, posterior truncated, sides parallel, adap- 

 ically low, gently inflated, adorally flattened to slightly depressed. 



Apical system. — Anterior, monobasal. 



Ambulacra. — Petals broad, with slight tendency to close distally, 



