Page 420 - Introduction to Paleobiology and The Fossil Record

DEUTEROSTOMES: ECHINODERMS AND HEMICHORDATES 407

(a) (b) (c)

(d) (e) (f)

(i)

(g) (h)

(l)

(j) (k)
Figure 15.15 Aboral, oral and lateral views of some echinoid genera: (a–c) Cidaris (Recent; regular),
(d–f) Conulus (Cretaceous; irregular), (g–i) Laganum (Recent; sand dollar) and (j–l) Spatangus (Recent;
heart urchin). All approximately natural size. (From Smith & Murray 1985.)