340 ECHINODERMATA. 
with an oval base concave underneath. The contour is sometimes 
slightly angular(1). i 
Sometimes the middle of the back is elevated(2). 
There are some also in which the contour is not angular(3). 
And others in which it is almost orbicular—Lacanum, K1.(4) In 
Fisutaria, Lam.—Ecurnocyamus, Leske, 
We observe the rosette of Clypeaster, an almost globular body, 
with the mouth and anus appropriated beneath. The Fibulariz are 
generally very small(5). In 
Spatancus, Lam. KI. 
On the contrary, we find the lateral mouth of the Ananchites, and 
incomplete bands of pores forming a rosette on the back. There 
are usually but four of thems; the one that extends towards the 
mouth is obliterated. 
Some—-Brissoipes, K].—have an oval shell without furrows(6). 
Others have a furrow, more or less strongly marked, in the di- 
rection of the obliterated band(7). When they are oval they con- 
stitute the Brissus, Kl.; but sometimes this furrow is deep and the 
shell is widened, assuming the figure of a heart(8). 
me ne Oe a ee ee eee 
(1) Ech. rosaceus, and its varieties, Encye., 143, 1—6; 144, 7, 8; 147, 3, 4, taken 
from Klein, &c. 
(2) Ech. altus, Scill., Corp. Mar., IX, 1, 2. 
(3) Eeh. oviformis, Seb., III, x, 23; Encyc. 144, 1, 2;—Zch. reticulatus, Seb., 
XV, 23, 24, 35—38; Encyc., 141, 5, 6;—Ech. pyriformis, Kl., LI, 56; Encyc. 159, 
It 127 ‘ 
(4) Echinus orbiculatus, Bourg., Petrif., LUI, 352;—Ech. laganum, Seb., XV, 
25, 26;—Ech. subrotundus? Scill., Corp. Mar., VIII, 1, 3;—ch. orbicularis, Gualt., 
Test., CX, B;—Ech. corollatus, Walch., Mon. Diluv, I, E, ii, 8. 
(5) Ech. nucleus, Kl., XLVIIL, 2, a, e; Encyc., 153, 24—28;—Ech. lathyrus, 
Kl., XLVIII, 1, a, e; Encyc., 154, 6, 10;—ch. craniolaris, Pall., Spicil. Zool., 
IX, 1, 24; Encyc., 154, 1—5, &e. 
(6) Ech. teres, Seb., Ill, xiv, 3, 4, 5, 6, X, 22, ab. 19; Encyc., 158, 7—11, 159, 
1, 2, 3, &c.;—Ech. brissoides, Kl., XX VII, B; Encyc., 259, 4;—Ech. amygdala, K1., 
XXIV, h, i; Encyc., 159, 8, 10. 
(7) Ech. spatangus, Seb., III, xiv, 3, 4, 5, 6, X, 22, ab. 19; Encyc., 158, 7—11, 
159, 1, 2, 3, &e.;—Leh. radiatus, Kl., XXV; Encyc., 156, 9, 10;—Spat. suborbicu- 
laris, Cuy., and Brongn., Envir. de Par., 2d edition, v, 5;—Spat. ornatus, tb., 6. 
(8) Ech. purpureus, Mill., Zool. Dan., VI;—Ech. flavescens, Id., XCI, to which 
