MOTIONS OF ANIMALCULES. 69 



other connection with tliem than the attachment 

 at the bottom. The Cothurnia are separated by 

 some writers from the Vorticellids, but while that 

 family is permitted to contain the Stentors^ one of 

 which is often found in a gelatinous tube, the 

 Cothurnia and their allies may remain in it without 

 disadvantage. 



Towards the end of the month a great number 

 of black pear-shaped bodies, visible to the naked 

 eye. were conspicuous in some water from the 

 Kentish Town ponds. Upon examination they 

 were found to be filled with granules that were red 

 by reflected, and purple by transmitted light. 

 Each one had a spiral wreath of cilia, with a 

 mouth situated like those of the S ten tors, here- 

 after to be described, but none of them became 

 stationary, and in a few days they all disappeared. 

 In the same water were specimens of that singular 

 Rotifer, the Salpina^ about 1-150" long, and 

 furnished with a lorica^ or carapace, resembling a 

 three-sided glass box, closed below, and slightly open 

 along the back. At the top of this box were four, 

 and at the bottom three, points or horns, and the 

 creature had one eye and a forked tail. Keeping 

 him company was another little Rotifer, named after 

 its appearance, Monocerca rattus^ the 'One-tailed 

 Rat.' This little animal had green matter in its 

 stomach, which was in constant commotion. I 



