NEW CILIATE INFUSOIUAN. 



477 



stantly vibrated backwards and forwards ; that the movements 

 of the animalcule consisted of rapid and continuous revolutions 



Calyptotricha pleuronemoides, nob., in different stages of development. 

 A. First stage. B. The same, further developed. C. End view of lorica, 



D. The perfect animal, like the others adherent to the leaf of Myriophyllum. 



E. Diagrammatic sketch of a momentary view obtained of the ventral surface 

 in the act of protrusion ; the velum is drawn backwards. 



Drawn from nature and all highlj' magnified. 



on its longitudinal axis ; also that it was enclosed in an oval, im- 

 perforate, hyaline cyst or lorica. This first observation was made 

 on March 16th. 



On March 23rd I discovered that the lorica had increased in 

 size, and that one end was elongated into a teat-like form ; the 

 contained animalcule had also increased in size, and a slight 

 depression was visible on the ventral side at the entrance to the 

 velum. At this stage, by an accident, the slide on which the 

 animal was living became dried up, and I was unable to follow 

 its further development. 



On March 28th I found several other specimeus, one of which 

 had developed a most remarkable lorica, open at both ends, and 

 of a symmetrical form. The enclosed animalcule was of a larger 

 size than those previously examined. The body was somewhat 



