l6 SYNOPTIC KEY 



Lorica present or absent. Foot usually with two toes. 

 (Pratt, 235; W. and W., 587.) Order Notommatida 



4(3, 5) Mouth nearly in center of large ciliary crown which is 

 either circular or drawn out into lobes, points, or arms. 

 Foot never ending in two toes placed side by side. 

 Mostly attached or tube bearing rotifers, the foot 

 forming a disk for attachment. A few free-living 

 forms in which the foot ends in a single toe, sometimes 

 accompanied by a dorsal spur. (Pratt, 232; W. and 

 W., 609.) Order Floscularida 



5(3, 4) Ciliary crown surrounded by two parallel wreaths of 

 cilia with a furrow between; cilia of the outer wreath 

 always shorter than those of inner. Furrow between 

 the cilia sometimes clothed with short cilia. Foot 

 never ending in two toes side by side, sometimes lack- 

 ing. Eyes two, rarely absent. Fixed or free-swim- 

 ming; the free-swimming species often without feet 

 and frequently bearing appendages on the body. 

 (Pratt, 233; W. and W., 611.) Order Melicertida 



Phylum B R Y O Z O A 

 (After Pratt) 

 1(2) Tentacles not retractile within the hard case which 

 surrounds the body (zooecium); anus lies within the 

 circle of tentacles; one row of tentacles present; minute 

 forms both in salt and fresh water. (Pratt, 246; 

 W. and W., 951.) Class and order Entoprocta 



2(1) Tentacles retractile within the zooecium; animals 

 living in large colonies; anus outside the lophophore. 

 Class contains great majority of Bryozoa. 



Class Ectoprocta, p. 16 



Class ECTOPROCTA 



1(2) Mostly marine with a circular lophophore; mouth 

 can usually be closed by an opercular flap. (Pratt, 

 249; W. and W., 951.) Order Gymnolaemata 



