196 



ZOOLOGY 



Abnormalities are frequently found among starfishes, 



partly on account of their 

 capacity for regeneration, 

 even from the disk and a 

 single arm. Thus one may 

 find a starfish with three or 

 four rays, or with a small 

 ray interpellated in be- 

 tween normal-sized ones. 

 Not all abnormalities seem 

 to be the result of mutila- 

 tion, however; for example, 

 sometimes two arms seem 



FIG. 180. Abnormal starfish (Asterias), 



apparently produced by fusion of two to be tused (b Ig. 18U). 

 rays. One-half nat. size. Photo, by 

 W. H. C. P. 



Other Starfishes. Aste- 



FIG. 181. Cribrella sanguinolenta. Nat. size. From Leunis. 



