182 



SPATANGACE^E. 



ECHINIDJE. 



SPATANGACEJE. 



Genus Spatangus. Klein. 



Generic Character. — Body cordate, depressed, having two sets of ambulacra, 

 dorsal and oral, four of the dorsal ambulacra petaloid ; no dorsal impression ; 

 sub-anal impression transverse sub-inferior. 



PURPLE HEART-URCHIN. 



Spatangus purpureas. Muller. 



Specific Character. — Broadly heart-shaped, depressed, sloping towards the anus ; 

 anal impression ovate ; sub-anal broadly reniform ; lateral ambulacra linear lan- 

 ceolate, pointed at both ends. 



Spatangus purpureas, 



Muller, Zool. Dan. Prod. 2850 ; Zool. Dan. tab. vi. 

 Leske, p. 235, t. xliii. fig. 3-5. Lamarck, Anim. 

 sans Vert. 1 Edit. III. p. 29 ; 2 Edit. III. p. 324. 

 Encyc. Meth. pi. clvii. f. 1-4. Fleming, Brit. Anim. 

 p. 480. Blainville, Man. dActin. p. 202. pi. xiv. 

 f. 1, 2, 3. Agassiz, Prod. 



