654 Transactions of the Society. 



In some individuals the segmentation can be distinctly seen, but 

 in others it appears merely as a slight corrugation. The lowest 

 segment is much larger and broader than the others. 



By means of carmine, I was able to impart a brilliant hue, not 

 only to the tube, but to the pedicle, and I then saw for the first 

 time small Infusoria attached to the surface of the lorica and 

 pedicle. 



The free extremity of the animal, when it is extended, is of an 

 oval form, hardly as long or as broad as the aperture of the lorica. 

 At one end is placed an operculum, so that when the body is 

 contracted it closes the narrow part of the neck of the lorica (see 

 Fig. 2). In the centre there is a round protuberance, which 

 appears to be of the same substance as the lorica. 



This extremity much resembles that described by Mr. F. W. 

 Hutton.* Its flat surface is placed transversely to the mouth of 

 the lorica, and it is furnished with two strong cilia, or setae, which 

 are forked at about half their length. Besides these there are a 

 number of much finer cilia arranged round the margin, and in the 

 centre is a wreath of very minute cilia in constant motion. 



The forked appendages and long marginal cilia move with a 

 spasmodic jerk, and are very irregular in their action ; they do not 

 cause a vortex in the water like the central cilia. 



In the anterior part of the animal are two contractile vesicles. 

 No eye-spots were apparent. 



The body, when extended, is spindle-shaped ; containing 

 granules of various shades from a pale yellow to a dark green, 

 amongst which are a number of vacuoles. Towards the posterior 

 extremity the body is of a dark sepia tint, but contains a light- 

 coloured and rather large spot. 



When the animal is extended it is much smaller than the lorica, 

 but when contracted it fills the lower portion of it, as shown in 

 Fig. 2. At the lower extremity of the tube the horny substance 

 doubles on itself and forms a band running round the margin of the 

 body ; from which project two processes growing parallel with 

 the pedicle. They show no signs of structure. 



The footstalk is 1| times the length of the lorica in the adult. 

 It is composed of a much more horny substance, as I find it always 

 bent abruptly, forming an angle. The proximal end of the stalk 

 is shghtly expanded, and throws out a number of prolongations 

 of various lengths, some going half round the Confervae. I did 

 not observe the animal at any time contract its stalk, or in fact 

 exhibit any movement in this part. 



The animals appear to possess a great amount of sensitiveness 

 to external influences. Sometimes by darkening the stage or by 

 the slighte.-t movement they will instantly contract, and will not 

 * Tliis Journal, i. (1878) p. 49. 



