SERTULAllIA CUSCUTA OF ELLIS. 491 
On several parts of the stem of this Sertularia I observed 
a Vorticella, which I had not met with before, and which 
is not figured in the invaluable work of Muller on In- 
fusory Animals. It is more nearly related to V. citrina of 
that author than to any other ; but its composite nature, 
and dark internal medullary matter, form sufficiently 
marked characters. It continued always fixed ; otherwise, 
had it been a free animal, with caudal claspers, I should 
have traced its affinity to the V. senta of that author, and 
to the genus Furcularia of Lamark. It may be termed i 
Vorticella coalita. The annexed figure (Plate XV. fig. %} 
will convey an idea of its characters. 
Manse of Flisk, > 
February 15. 182S. I 
