ECIIINOID GENUS ECHINOCOIÎYS

GENUS ECIITNOCORYS IN THE SENONIAN OF BELGIUM 47
and most probable ancestor E. ciplyensis. The form is associated with both
ciplyensis and belgicus in the Craie de Ciply and it therefore could have derived
its characters from either of I hose species.
OCCURRENCE : Characleristic of the Craie phosphatic of Ciply and found at
Ciply.
FIG. 25 a-c. — Echinocorys ciplyensis var. ariuiiidi. (a) contour (b) longitudinal profile
(c) transverse profile of a specimen from the Craie phosphatic of Ciply at, Ciply, figured
specimen Musée d'Histoire Naturelle, Brussels (Musée No. 22). Same individual figured
in Lamberfa « Note sur les échinides de la Craie de Ciply » (Bull. Soc. Belge de Gêol, N°ll).
Evolution and stratigraphie distribution.
The writer must, from force of, necessity, minimize here any detailed zoning
or very .lose stratigraphie determinations. This must be done for the simple
reason that the present existing collections of this genus have nol been collected,
nor labeled, with such detailed work in view. And unfortunately the localities,
once so abundantly fossiliferous, have been so worked that the possibility for
making good representative collections for more careful stratigraphie determinations
are very small. But however, one can with certainty, make more general