NO. 3 CASSIDULOID ECHINOIDS — KIER 187 



very similar floscelle, and a naked band in interambulacrum 5 and 

 ambulacrum III. 



CLYPEOLAMPADIDAE Kier, new family 



Large, highly inflated, flat adoral surface, elongate; apical system 

 anterior, tetrabasal or monobasal ; petals broad, straight, open, long, 

 with pores joined by deep conjugation groove, poriferous zones in 

 same petal of equal length, ambulacral plates beyond petals single 

 pored ; periproct inf ramarginal, transverse ; peristome pentagonal, 

 anterior, transverse ; bourrelets moderately to strongly developed ; 

 phyllodes slightly widened to broad, single pored ; buccal pores pres- 

 ent ; narrow, naked granular zone in interambulacrum 5 adorally. 



Genera. — Clypcolampas, Vologesia. 



Range. — Cretaceous ( Cenomanian-Maestrichtian ) . 



Comparison with other families. — The Clypeolampadidae are dis- 

 tinguished from Echinolampadidae by their petals, which have broad 

 poriferous zones of equal length with strongly conjugated pores, 

 whereas in the Echinolampadidae the poriferous zones are narrow, 

 of unequal length in the same petal, and not strongly conjugated. 



Genus CLYPEOLAMPAS Pomel 



Clypcolampas Pomel, 1869. Rev. echinodermes, p. 25. Type species by monot3'py, 



Clypcaster leskei Goldfuss, 1829 (=zGalcritcs oivtus Lamarck, 1816). 

 Synonym : Phylloclypcus De Loriol. 



GENERIC DESCRIPTION 



Large, elongate, highly inflated, flat adorally, apical system mono- 

 basal, anterior ; petals broad, open, long, unequal, outer pore of 

 petaloid pores very elongated transversely, slitlike, joined to inner 

 pore b}^ narrow, deep conjugation groove, single pores in ambulacral 

 plates beyond petals ; periproct inf ramarginal, transverse ; peristome 

 anterior, pentagonal; bourrelets very prominent, projecting into 

 peristome ; phyllodes very broad, single pored, crowded ; buccal pores 

 present ; two types of tubercles : small scrobiculate, crenulate, perfo- 

 rate tubercles on both adapical and adoral surface except in medial 

 region of interambulacrum 5 adorally ; large nonscrobiculate, non- 

 crenulate, nonperforate tubercles on adapical surface and in medial 

 region in interambulacrum 5 adorally. 



Comparison with other genera. — Clypeolampas is most similar to 

 Vologesia, but differs in having large tubercles on its adapical surface 

 and a more developed floscelle. It looks very similar, on first impres- 



