ORDER PEDICELLATA. 449 
nucleolites, but they are distinguished by their incomplete 
bands of pores, that is to say, not proceeding from one pole 
to the other, and figuring a star. (Casstdulus Caribeorum, 
Lam.) 
Other irregular echini have not the mouth at the centre of 
their base, but it is towards one side, often transversely, and 
directed obliquely. The anus is towards the other side. 
They are subdivided according to the extent of their ranges 
of holes. 
Thus the ANANCHITES, Lam., GALE, Kl., have a littie 
the form of the Galerites, and their complete bands, their 
greatest difference, consists in the position of the mouth. 
They are only known in the fossil state. Such is 
Ecuinus Ovatus, L., Cuv. et Brong. 
(Envir. de Paris, 2d. edit. f. v. 7. A. B. C. D.) 
A species extended in innumerable quantities in the chalk 
formations of our environs. 
Some have four bands. (Ech. quadriradiatus, K).) 
We may make a particular subgenus of certain species, in 
which the four lateral bands are disposed by pairs, and do not 
rejoin at the same point. (Kch. bicordatus, K1.) 
At other times these irregular echini, with central mouth, 
have bands of pores which do not lead to the mouth, but 
which form on their back a sort of rose. Such are 
CLYPEASTER, Lam. ECHINANTHUS, Klein., 
Which have the anus near the margin, and whose body is 
depressed, with oval base concave underneath. They have 
sometimes the contour alittle angular. (Hch. rosaceus, and 
its varieties, K/.) 
Sometimes their back is elevated in the middle. (Hehinus 
altus.) 
VoL. XU. Gg 
