NO. 3 CASSIDULOID ECHINOIDS — KIER 99 



Occurrence.— lJ]ppev Cretaceous (Senonian) of Germany and 

 Poland. 



Location of type specimen. — Not known by this author. 



Family ECHINOLAMPADIDAE Gray, 1851 



Medium to large, elongate to circular, usually highly inflated ; apical 

 system tetrabasal or monobasal ; periproct marginal to inf ramarginal, 

 transverse or longitudinal ; peristome transverse ; petals long, usually 

 broad, open, usually with poriferous zones of unequal length in the 

 same petal, in earlier genera outer pore slitlike, single pores in 

 ambulacral plates beyond petals; bourrelets well developed; phyl- 

 lodes widened, single pored, with few or many pores; buccal pores 

 present ; tubercles adorally only slightly larger ; narrow, naked, granu- 

 lar zone in interambulacrum 5. 



Genera. — Parapygus, Arnaudaster, Echinolampas, Plesiolampas, 

 Conolampas. 



Range. — Cretaceous (Cenomanian) to Recent. 



Comparison zvith other families. — The Echinolampadidae differ 

 from the Faujasidae in having less developed bourrelets and more 

 open petals, with poriferous zones in the same petal of unequal 

 length. They differ from the Pliolampadidae in having narrower 

 poriferous zones of unequal length, and in having a naked granular 

 zone in interambulacrum 5, 



Genus PARAPYGUS Pomel 



Parapygus Pomel, 1883. Class, meth., p. 61. Type species by subsequent desig- 

 nation, Lambert, 1898, p. 162, Botriopygiis cotteauanus d'Orbigny. 

 Synonyms : Pseiidocatopygiis Cotteau and Gauthier ; Rostropygus Szorenyi. 



GENERIC DESCRIPTION 



Medium to large, elongate somewhat inflated, with well-rounded 

 margin, slightly depressed adoral surface; apical system tetrabasal 

 anterior, with four genital pores, posterior genital plates separated 

 by genital 2 ; petals well developed, open or with slight tendency 

 to close distally, pores conjugate ; single pores in ambulacral plates 

 beyond petals ; periproct marginal, longitudinal ; peristome anterior, 

 regular, pentagonal, wider than high; bourrelets well developed, ex- 

 tending convexly into peristome; phyllodes single pored, broadened, 

 two or rarely three rows of pores in each half -ambulacrum, approxi- 

 mately 10 in each outer series, 3 or 4 in each inner, i to 3 in each 

 median series; buccal pores present. 



