236 



AQUATIC MICROSCOPY FOR BEGINNERS. 



15. Brachi6nus (Fig. 168). 



There are numerous species of this genus; all of 

 which may be known by the presence of a lorica with 

 several tooth-like projections or long spines on the 

 front margin, and often likewise at the rear; by the 

 two ciliary disks and, when present, the single eye- 

 spot. The species whose empty 

 lorica is shown in Fig. 168, is very 

 attractive in its glass-like transpar- 

 ency, active movements, and beauti- 

 ful lorica. It is not uncommon, and 

 may be easily recognized by the ten 

 long teeth or spines on the front 

 border — the central one on the upper 

 side or back being largest, and bent 

 usually at a right angle — and by the 

 four posterior spines. The foot is long, narrow, 

 and has two toes. 



Eggs are occasionally to be noticed attached to the 

 posterior margin of the lorica. It is Brachionus mili- 

 taris. The surfaces of the lorica are tessellated, or 

 marked in polygonal areas, and covered by small raised 

 points, all of which add much to its beauty and its in- 

 terest. 



Fig. 168. — Brachi6nus. 



