NO. 3 CASSIDULOID ECHINOIDS — KIER I49 



ing distally ; interporiferous zones three to four times width poriferous 

 zones ; pores conjugate, connected by deep groove, outer pore sHtlike, 

 inner pore sHghtly elongated transversely. 



Adoral interambulacra. — Single plate at peristome, preceded by two 

 series of alternating plates (text fig. 124), second plate in this series 

 greatly enlarged. 



Periproct. — Supramarginal, slightly elongated longitudinally, groove 

 originating at periproct continuing to posterior margin of test. 



Peristome. — Central to slightly anterior, circular opening. 



FlosceUe.—Bomre\Q.is (pi. 21, fig. 4) very strongly developed, 

 toothlike ; phyllodcs broad, single pored, with pores arranged in arc, 

 ambulacrum deeply depressed near peristome; phyllode of ambula- 

 crum III shorter than others ; approximately 18 pores in phyllode III, 

 22 in phyllodes II and IV, 16 in phyllodes V and I (chart 7, fig. e). 



Tnherculation. — Adorally tubercles much larger than adapically; 

 naked granular zone in interambulacrum 5. 



Occurrence.— Upper Cretaceous (Middle Maestrichtian) of south- 

 eastern United States. 



Location of type specimen. — Verneuil Collection, which according 

 to Sherborn (1940, p. 137) is in the ficole des Mines, Paris. 



Synonyms of HARDOUINIA 



Gonioclypcus Emmons, 1858. North Carolina Gcol. Surv. Rep., Agriculture of 

 the eastern countries, p. 309. Type species by monotypy, Gonioclypeus sii- 

 bangulalus Emmons 1838:^^11 ardouinia mortonis (Michelin). 



Figs. 119-127. — 119, Hardouinia hassleri (Twitchell) : Apical system of 

 USNM 108382, from the Santonian, Tombigbee sand member of the Eutaw 

 formation at Catoma Creek, Montgomery County, Ala., X 21. 120, Hardouinia 

 pofosinisis Lambert: Apical system of USNM 131281, from the Campanian at 

 St. Luis Potosi, Mexico, X 6. 121, Hardouinia mortonis (Miclielin) : Apical 

 system of USNM 131257, from lower Maestrichtian, 2.1 miles south of Pontotoc 

 Courthouse. Miss., X 6. 122, Hardouinia porrechis (Clark) : Apical system of 

 USNM 21890, from lower Maestrichtian (Ripley formation) at blufif on right 

 bank of Chattahoochee River near old Alexander Landing, NW^ sec. 9, T. 9 N., 

 R. 29 E., Barbour County, Ala., X 6. 123, Hardouinia kcUitmi (Stephenson): 

 Apical system of USNM 73421, paratype, from the lower Middle Maestrichtian 

 from the upper part of the Peedee formation, Rock Point Quarries, i mile 

 northeast of Rocky Point station. Pender County, N. C, X 6- 124, Hardouinia 

 mortonis (Michelin) : Adoral plate arrangement of USNM 131282, from the 

 lower Maestrichtian. Ripley formation, from bluffs of Chattahoochee River 

 10 miles south of Eufaula, Ala., X t. 125, 126, Archiacia palniafa Gauthier: 

 125, Apical system of holotype in Museum National d'Histoire Naturelle, Paris, 

 from the Cretaceous (Cenomanian) at Djebel Taferma, Tunisia: 126, Phyllode 

 of ambulacrum IV of specimen in Lambert Collection, Sorbonne, Paris, from the 

 Cretaceous (Cenomanian), Djebel Oum-Ali, Tunisia, X i.v 127, Archiacia 

 saadcnsis Peron and Gauthier: Phyllode of ambulacrum 11 of specimen in 

 Lambert Collection, Sorbonne, Paris, from the Cretaceous (Cenomanian) at 

 Bou Saade, Tunisia, X 8. 



