ON THE CLASSIFICATION OF THE ROTIFERA. 81 



Fam. 7. Synchcetada (PI. C. fig. 6). 



Corona a transverse spheroidal segment, sometimes much flattened, with styligerous 

 prominences ; ciliary wreath a single interrupted marginal curve, encircling the corona ; 

 trophi forcipate l ; foot minute, furcate, or absent. 



Fam. 8. Triarthradce. 



Corona transverse ; ciliary wreath single, marginal, fringing the buccal orifice ; 

 trophi malleo-ramate l ; foot absent. 



Fam. 9. Hydatinada (PI. C, fig. 5). 



Corona truncate, with styligerous or ciliated prominences ; ciliary wreath two parallel 

 curves, the one marginal fringing the corona and buccal orifice, the other lying within the 

 first, the styligerous prominences being between the two ; trophi malleate J \foot furcate. 



Fam. 10. NotommatadcB. 



Corona obliquely transverse ; ciliary wreath one of interrupted curves and clusters, 

 usually with a marginal wreath surrounding the buccal orifice ; trophi forcipate l ; foot 

 furcate. 



Sub-order. Loricata. 



Corona and ciliary wreath various in shape, but never Bhizotic, and Bdelloidic only 

 in the Pterodinada : trophi of different types, but never Bdelloidic, and Khizotic only 

 in the Pterodinadce. 



Division I. 



Foot jointed, stylate or furcate ; not transversely wrinkled, nor wholly retractile. 



Fam. 11. Rattulid. 



Lorica entire, cylindrical, without angles ; trophi asymmetrical. 



Fam. 12. Dinocharida. 



Lorica entire, vase-shaped, sometimes facetted ; head distinct, with a chitinous 

 covering ; trophi symmetrical. 



Fam. 13. SalpinadcB. 



Lorica compressed, cleft down the back, the two halves united by a membrane, so as 

 to form a dorsal furrow. 



Fam. 14. Euchlanidce (PL C. fig. 10). 



Lorica depressed, of two dissimilar plates, one dorsal and one ventral, united by a 

 membrane so as to form a lateral furrow. 



Fam. 15. LepadelladcB. 



Lorica depressed, broad, closed beneath ; head distinct, surmounted by a retractile, 

 arched, chitinous plate. 



Fam. 1G. ColuridcB. 



Lorica compressed, open beneath ; head distinct, surmounted by a retractile, arched, 

 chitinous plate. 



1 For description of these technical terms, see pp. 28, 29. 



