6 



GUIDE TO THE CORAL GALLERY. 



High Wall " flowers of tan." The cysts rupture and liberate AnioRba-like 

 E^ «id of spores (flagellulas), which fuse together to form a plasmodium. 

 Gallery. Didymium, one of the Mycetozoa, is figured in Plate II. in the 



Case. 



Heliozoa or Sun Animalcules. 



The Sun Animalcules are more or less spherical in form and pro- 

 vided with fine ray-like pseudopods. They mostly inhabit fresh water. 

 Actinophrys sol, the Common Sun Animalcule (Fig. 2), lives 



Fig. 4.1 



Miliolina tenera, one of the Imperforate Foraminifera. Young 

 living animal with expanded pseudopods. A nucleus is seen 

 in the innermost chamber. Magnified. (After Max Schultze.) 



aihongst weeds in ponds. " It commonly appears as a globular, 

 hyaline, foamy, or vesicular body, bristling with delicate rays, and 

 suspended almost stationary in the water " (Leidy). The total 

 diameter is about i,\ of an inch. The body generally contains, in 

 addition to the central nucleus and the contractile vacuole, numerous 

 vacuoles and food-balls : the contractile vacuole is usually seen 

 emerging from a point on the surface, bursting, and reappearing at 

 the same spot (Model 3). Actinophrys swims by means of its 

 flexible pseudopods, and when one of these touches some organism, 

 the latter is drawn towards the body and engulfed. Well might 



' From " Encyclopsedia Britannica." \ 



