ORDER V EUECHINOIDEA—SPATANGOIDA 241 
Cretaceous. Studeria, Duncan. Tertiary and Recent. Phyllobrissus, Cotteau. 
Jura and Cretaceous. 
Clypeus, Klein. Test large, low, nearly flat actinally. dmb wide, petaloid, 
not closing dorsally, narrow at the ambitus and actinally. Pairs of pores in 
B C 

Fig. 388. 
Pygurus Royerianus, Cott. Kimmeridgian; Tonnjesberg, near Hanover. A, B, Dorsal and ventral views of 
test, 3/; natural size. C, Apical system, enlarged. J), Ambulacral plate, magnified. 
the petaloid parts with the inner pore small and circular, the outer transversely 
elongate, and in a long groove. Periproct high up, usually in a groove along 
the median line of the posterior Jdmb. Upper Jura. 
Pygurus, Ag. (Fig. 388). Test large, angular, rounded, or cordiform in 
marginal contour; depressed or rather tall and sub-conical dorsally. Amb 
Fic. 389. 
Echinolampas Kleini, Goldf. Oligocene ; Doberg, near Biinde. 1/). 

flush dorsally, unequal, long ; the petaloid parts contracting but not closing 
marginally, and expanding again actinally, where the Amb are grooved.  Peri- 
proct infra-marginal, pyriform or ovoid, in a special area or rostrum close to 
the posterior edge of the test. Upper Jura and Cretaceous. 
Echinolampas, Gray (Fig. 389). Test variable in size and shape, more or 
less ovoid or circular at the tumid marginal outline; tall and conical or 
VOLS Tt R 
