82 NATURAL HISTORY 



132. CycLiDiUM glaucoma. The azure Cydidium is of 

 a flat oval form, as shewn at figure 58. In its usual con- 

 dition it is pellucid, but when fed with colouring matter, 

 dark spots may be seen, as in the drawing. In swim- 

 ming, it sometimes rotates, and exhibits its narrow side 

 view; and if the water be filled with opaque particles, a 

 current may be perceived towards the front of it, indi- 

 cating the presence of cilia, which, however, can only 

 be seen when the animalcule is expiring. (See figures 

 59 and 60.) These creatures propagate by division, 

 during the progress of which they alter their form. 

 (See figure 61.) They require a magnifying power, from 

 400 to 800 times to view them distinctly. Length, 

 l-1400th to MSOOth of an inch. 



133. Cyclidium scintillans (Glaucoma scintillans, new 

 genus, E.) The glittering pearl Animalcule, shewn at 

 figures 192 and 193, plate 4, has probably been con- 

 founded with the preceding. The body is soft ; the mouth 

 is situated on the under side near the centre, and fur- 

 nished with a strong bristle : when this oscillates, and is 

 viewed from above, it presents the appearance of a pul- 

 satory organ, like the heart. They propagate by trans- 

 verse division, and probably also by ovae, as very small 

 specimens are seen among them. Found in stagnant 

 water. Size l-570th of an inch. 



134. Cyclidium margaritaceum, E. {new species.) — 

 This, like the Ci/clidium glaucoma, is furnished with a 

 cluster of cilias on the under part of the anterior ex 

 tremity. Size, 1- 1200th to 1- 1500th of an inch. 



