i 
DICHOTOMY. 103 
termed “budding.” Very little experience enables an 
observer to distinguish between a dichotomized ray and 
a bud, 
In 1831 Tiedemann ! published a brief description of a 
star-fish, Astevzas equestris Linn, with a partially dicho- 
tomized ray, and pointed out that it must be regarded as 
Or? 4, 
OD) 
LVRS 
pessnee cies 
rity 
= VANS 
Fic. 51.—A, Star-fish with a completely dichotomized ray ; 
B, a larger ray partially dichotomized. 
a malformation and not regeneration, as is so frequently 
the case with star-fish. 
Dichotomy occurs also in the appendages of the skin. 
Few parts seem more distinct than feathers and 
teeth, yet a study of the manner in which these 
« “Zeitschuift fiir Physiologie,” Bd. iv. p. 12% 
