l88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



sion, to Echinolampas but differs in having much wider poriferous 

 zones of equal length, with deeply conjugated pores. 



Remarks. — There has been some controvers}^ over whether or not 

 the apical system in Clypeolampas was tetrabasal or monobasal. 

 Cotteau (1887, pi. 20, fig. 7) showed a tetrabasal system in his 

 C. lesteli. However, the apical system in the type species of the 

 genus, C. ovatus, is definitely monobasal as shown in my plate 35', 

 figure 2. I did not see Cotteau's specimen of his C. lesteli, but suspect 

 that is probably monobasal also, although it is possible that this 

 character may be variable in this genus. 



Range and distribution. — Upper Cretaceous (Campanian to Mae- 

 strichtian) of Europe and India. 



DESCRIPTION OF TYPE SPECIES 



CLYPEOLAMPAS OVATUS (Lamarck) 



Plate 35, figures 1-4 ; text figure 160 



Galeriles ovatus Lamarck, 1816. Animaux sans vertebres, vol. 3, p. 22. 

 Clypeaster Icskei Goldfuss, 1829. Petrefacta Germaniae, p. 132, pi. 42, fig. i. 



Material. — Two specimens studied in the ficole National Superieure 

 des Mines, three in the Museum National d'Histoire Naturelle, Paris, 

 one borrowed from General Collignon, and one in the U. S. National 

 Museum. 



Shape. — Very large, elongate, slightly pointed posterior margin, 

 highly inflated adapically with greatest height at apical system ; 

 adorally flat with sharp margin. 



Apical system. — Anterior, large, monobasal (pi. 35, fig. 2) with 

 inflated madreporite. 



Ambulacra. — Petals broad, open, flush, extending to margin, pos- 

 terior petals longer than others ; at extremities interpori f erous zones 

 twice width of poriferous zones; outer pore of petaloid pore pair 

 greatly elongated transversely, slitlike, joined to inner pore by deep 

 narrow conjugation pore. 



Periproct. — Inframarginal, large, transverse, flush with test. 



Peristome. — Anterior, large, pentagonal, transverse. 



Floscelle. — Bourrelets very prominent, jutting out over peristome ; 

 phyllodes (text fig. 160) large, broad, single pored with many pores, 

 approximately 15 in each outer series of half area, 20 in each inner 

 area, not arranged in series ; total of 70 pores in each phyllode ; buccal 

 pores present. 



Tuberculation. — Two types of tubercles : small scrobiculate, crenu- 



