144 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Floscelle. — Bourrelets strongly developed, toothlike, extending into 

 peristome; phyllodes deeply depressed between bourrelets, broad, no 

 other details visible but probably single pored and similar to those 

 found in Faiijasia or Hardouinia. 



Occurrence. — Upper Cretaceous (Maestrichtian) at Orrit, Cata- 

 lonia, Spain, 



Location of type specimen. — Lambert Collection, Sorbonne, Paris. 



Remarks. — The holotype is not as well preserved as would appear 

 from a study of Lambert's figures of it. The adoral surface is almost 

 completely covered with matrix, with only a tip of several bourrelets 

 visible. Lambert's figure of the floscelle is largely a reconstruction, 

 and his representation of the structure of the phyllodes may not be 

 correct. The apical system had never been described, although Mor- 

 tensen (1948, p. 126) suggested that it was probably monobasal, but 

 it is visible on the holotype and is definitely tetrabasal. 



Genus HARDOUINIA Haime 



Hardouinia Haime, in D'Archiac and Haime, 1853. Descr. animaux foss. Inde, 

 p. 214. Type species by monotypy, Pygorhynchus mortonis Michelin. 



Synonyms : Clarkiclla Lambert ; Cossmannaster Lambert ; Gonioclypeus 

 Emmons. 



GENERIC DESCRIPTION 



Medium to large, elongate to circular, often highly inflated, flat 

 adorally, apical system tetrabasal ; petals very broad, closed, usually 

 of equal length, pores strongly conjugate, ambulacral plates beyond 

 petals single pored ; periproct supramarginal, longitudinal, in groove ; 

 peristome central to slightly anterior, pentagonal to circular ; bourre- 

 lets strongly developed, usually projecting into peristome, often tooth- 

 like; phyllodes moderately wide to very wide, single pored, pores in 

 one or two series in each half -ambulacrum, often arranged in arc, 

 widely separated from edge of peristome, deeply depressed between 

 bourrelets ; buccal pores present ; adorally tubercles much larger than 

 adapically, naked granular zone in middle of interambulacrum 5 and 

 ambulacrum IL 



Comparison zvith other genera. — Hardouinia appears to be de- 

 scended from Petalohrissus. The older species of Hardouinia such as 

 H. stantoni (Clark) and H. bassleri (Twitchell) are quite similar to 

 some of the species of Petalohrissus. They have very similar phyl- 

 lodes, slightly widened with two series of pores in each half-ambula- 

 crum, a supramarginal, longitudinal periproct, and a similarly shaped 

 test. However, the bourrelets in these older species of Hardouinia 



