170 THE MICROSCOPE. 



wise, and having six scallops at the upper part, whence the pale citron- 

 coloured inhabitant protrudes itself. Two horn-like processes are ap- 

 pended to its under-side. As occasions require, it sinks firmly and 

 securely within its crystal home, through the sides of which its organi- 

 sation can be distinctly seen. Its progress is effected by means of its 

 rowing cilia. 



Brachionus Pala, or Bent Horn Animalcule, Anurce Cervicornis, is 

 possessed of double rotatory organs, and four long processes, that pro- 

 ject above the oval shell. It measures the 90th part of an inch. 



Brachionus Ovalis, or ^Egg-shaped Brachionus, is remarkable for the 

 strength of its transparent shell, which is beyond that of other shelled 

 creatures. Its projecting tail, as well as head, can at pleasure be with- 

 drawn into its powerful case. It attains to about the 250th of an inch 

 in size. 



Brachionus Tripos, or Three-spined Brachionus, has its shell in two 

 parts, united by a joining at the back; it ends in three spines, and be- 

 tween the two first projects its cleft tail. 



Brachionus Dentatus, or TootJied Brachionus. This active, bright, 

 pink-eyed little creature, the 90th part of an inch in size, is enclosed in 

 a two-valved shell, having each end indented so .as to form two pair of 

 teeth. Mr. Pritchard says : " In addition to the rotatory organs for 

 supplying it with food, I have observed it attached to a stem of con- 

 fervse, and abrading it with its teeth fixed in the bulbous oesophagus, 

 which, during the operation, oscillates quickly ; the rotatory cilia at the 

 same time move rapidly, which makes it highly probable that they per- 

 form some office connected with the organs of respiration, as their 

 motion seems altogether unnecessary while the creature is feeding in 

 this manner." 



Brachionus Urceolarie, or Mower-pot Brachionus, resides in a shell 

 one-half its own length, from which it thrusts out its tail at one end, 

 and its vibrating cilia at the other : at this latter part it has sharp in- 

 dentations at one side, and flowing scallops at the other. 



Brachionus BaJceri, or Baker's Brachionus (fig. 101, No. 4), is a 

 curious and beautifully-formed animal. At the points of a half-circle 

 are situated the rotatory organs and cilia, between which rise some 

 long spines, each side of the shell proceeding to a point in the lower 

 part, while a square seems taken out of its body, forming thus two 

 spines ; from the centre projects a long tail. The eggs are sometimes 

 attached to the spines, and in other instances to the tail. 



Notom/mata Aurita, the Eared Notommata. The anatomy of this 

 animal, of the Rotatoria family, is most lucidly explained and beauti- 



