1892.] 



MICllOSCOPICAL JOURNAL. 



53 



tenuity which branch and anastomoze with tolerable frequency, but are 

 not stiffened by an axial fibre, as in other Heliozoa. Assimilation ot 

 food particles taken up by the pseudopodia as a rule takes place in the 

 interior of the animal ; but when, as sometimes happens, the food par- 

 ticles are too large to pass through the holes in the shell, digestion is 

 carried on outside the body, and is performed by the pseudopodia, 

 which are rendered broader by an afiiux of protoplasm to them from 

 the main mass, and invest the foreign body with a thin coating. 



-' Clathrulina multiplies by several methods. The simplest of these 

 is the simple fission, in which tiie protoplasmic body divides into two 

 parts, which for sometime after complete separation remain in the 

 shell and continue to emit pseudopodia, but sooner or later withdraw 

 their pseudopodia, form tiiemselves into a ball, force their way through 



Explanation of Plate. 



Fig. I. — Clathrulina Elegans, x 350. 



Fig. 2 — Enlargement (600 dia.) 10 show grooving 



of the outer surface of the latticed shell. 

 I' IG. 3 — .'Xn individual in which the products of 



the simple fissiou of the protoplasmic body have 



become encysted. 

 Fig. 4. — A product of fission with pseudopodia 



withdrawn, globular, preparatory to encyst- 



ment (x 320). 



ith minute siliceous 



Fig. 5. — A cyst covered 

 spinelets (x 600). 



Fig. 6. — A zoospore with 2 flagella, nucleus (»/) 

 and 2 contractile vesicles (<:). 



Fig. 7.— a flagelulla which has lost its shap; and 

 become an amoebula 



Fig. 8 — A young specimen which has a stalk (.?) 

 but no shell yet, food vacuoles [v v) and con- 

 tractile vesicle (c). 



