Protozoa and Rotifera at Havana, III. 339 



82. C. granulatum Kell. 



Many large colonies of this species were found in May upon 

 an Asellus taken from the west side of the river at E. 



ZOOTHAMNIUM BoRY. 



Similar to Vorticella and forming branching contractile 

 colonies ; but in this genus the contractile central thread 

 is continuous throughout, dividing with each branching of the 

 stem, whereby the act of contraction involves the entire 

 colony. 



83. Z. arbuscula Ehrbg. 



This interesting and beautiful form was met with twice in 

 the towings ; in June from Quiver Lake, and in August from 

 the river at E. A number were found on the latter occasion. 

 The colonies are usually large and symmetrical, and when 

 once seen will be remembered. 



Epistylis Ehrbg. 



Animals forming colonies, borne on a rigid, noncontractile 

 tree-like pedicel ; individuals bell-shaped, more or less elon- 

 gate to cylindrical ; adoral zone encircling a slightly raised 

 disc within the peristome margin, its oral end descending at 

 one side, through an excavated vestibule, to the mouth open- 

 ing; anterior end not so flexible as in Vorticella. 



Several species were found, but only two could be definitely 

 determined. 



84. E. plica tilis Ehrbg. 



Found at various times, especially in May, at a number of 

 different places, twice in river towings, but usually attached 

 to various insect larvae, and on the shells of water-snails, 

 such as Physa and Vivipara. Tokophrya quadripartita was 

 sometimes found associated with it. 



85. E. flavicans Ehrbg. 



This species was noted as abundant on plants on two occa- 

 sions in summer, and was found to be quite generally dis- 

 tributed, though not very abundant, in towings taken in the 

 winter time. 



