HEART-URCHINS 227 
Genus Lovenia 
L. cordiformis. About one inch by one and a half inches thick; 
reddish in color; resembles a little porcupine. Found on the southern 
California coast. (Plate LVIII.) 
Genus Schizaster 
S. fragilis. One and a half by two inches in size, and one inch thick; 
color brownish. Lives in deep water off the eastern coast. 
Genus Metalia 
M. pectoralis. A very large heart-urchin, found on the southern 
coast of Florida and in:the West Indies in shallow water. It is, per- 
haps, the largest species found, being six to eight inches long and pro- 
portionately wide and thick. The shell is thin, more or less elliptical, 
and densely clothed with long reddish-gray spines. (Plate LVI.) 
Genus Brissopsis 
B. lyrifera. A beautiful deep-water species, found off the coasts 
of Florida and the Gulf of Mexico. It has a red body with pale- 
yellowish spines. In size it is about two by two and a half inches, and 
is thickest on the posterior end. It is thickly clothed with long curved 
spines, some of which form two long tufts in the back. 
