HEART-URCHINS 227 



GENUS Lovenia 



L. cordif'ormis. 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 LVIII.) 



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. 



