ORDER IV EUECHINOIDEA—CLY PEASTROIDA 237 
ternal structure investing the dmb with a double wall, but not forming con- 
centric partitions near the edge. Tertiary and Recent. 
fei 
So 
~ 

Fic. 382. 
Clypeaster grandiflorus, Bronn. Miocene ; Boutonnet, near Montpellier. 1/2 natural size (after Desor). 
Plesianthus, Dunean ; Anomalanthus, Bell. Recent. 
Laganum, Klein. Belongs properly to a separate family or sub-family. 
Tertiary and Recent. 
Family 3. Scutellidae. Agassiz. 
Test very flat, with entire or incised margin ; lunules or slits in the areas or 
not. Ambulacral furrows bifurcating and branching. Peristome flush ; jaws flat, 
teeth superior. Radiating partitions between the floors internally. Tertiary and 
Recent. 
Scutella, Lam. (Fig. 383). Test circular or sub-circular in outline, some- 
times undulating or notched, broadest behind. Petaloid parts of the Amb 
unequal, well-developed, nearly closed. Peristome small, central, sub-circular. 
Periproct very small, infra-marginal. Apical system central, more or less 
pentagonal. Tertiary. 
Sub-genus.—Lehinarachnius, Leske (Dendraster, Ag.) Apical system eccentric in front 
or behind. Periproct actinal, marginal or supra-marginal. Recent. 
Echinodiscus, Breyn. (Amphiope, Lobophora, Ag.) Like Scutella, but trun- 
cated posteriorly, and with two round or elongate lunules or slits there, 
one in each of the median lines of the postero-lateral dmb. Tertiary and 
Recent. . 
Encope, Ag. Test with a broad notch or a lunule in the median line of 
each Amb, and a lunule in the posterior Ldmb. Miocene and Recent. 
Mellita, Klein. Test very flat, with five or six usually closed lunules, 
