224 



ROTIFERA 



CHAP. 



Fain. 8. Microcodonidae : Microcodon E., Microcodides Bergendal. 



Fam. 9. Khinopidae : Rhinops H. 



Fam. 10. Hydatinidae : Hydatina E. (Fig. 106), Notops H., Hudsonella Zacl 



Gyrtonia Rouss. 

 Fam. 11. Synchaetidae : Synchaeta E. 

 Fam. 1 2. Notommatidae : Notommata E., Pleurotrocha E., Copeus G., Proales 



G., Furcularia G., Eosphora G., Triophthahnus E., Diglena E. 



(Fig. 113), Distemma E., Triphylus E., Taphrocampa G., 



Albertia Duj., Balatro Clap. 

 Fam. 13. Drilophagidae : Drilophagus Vejdovsky. 

 Fam. 14. Triarthridae : Triarthra'E., Polyarthra'K., Pteroessa G., Pedetes 



To this group belongs the eyeless Hydatina, a classical object 



Fig. 117. Pedalion 

 mirum, female. 

 (After Hudson.) A, 

 Ventral view ; B, 

 side view, a, Median 

 antenna ; a, antero- 

 lateral limb ; on, 

 anus ; ci, cinguluni ; 

 dl, dorso -median 

 limb ; e, eye ; /, cili- 

 ated pedal processes ; 

 I, lip ; vi, mouth ; pi, 

 postero-lateral limb ; 

 tr, trochus ; vl, ven- 

 tro-median limb. 



of study, common in greenish pools, whose male was the first 

 male Eotifer to be figured by Ehrenberg (1838), though he did 

 not recognise its nature, and gave it the name of Enteroploea 

 hydatina. Rhinops has the back of the corona curiously pro- 

 longed forwards into a sort of proboscis bearing two eyes. Some 

 species of Notommata and Proales are distinctly annulated ; in 

 Taphrocampa the segmentation is so marked as to give the appear- 

 ance of mesenteric septa extending inwards from the body- wall to 

 the intestine. Microcodon has a wreath which is very peculiar 

 in its extreme simplicity, with the mouth nearly central, and the 

 eye lying just dorsal to the mouth. The Triarthridae, which 

 resemble the Scirtopoda in having strong leaping spines fringed 

 by fine bristles, should perhaps be placed in the next sub- Order. 

 Sub-Order B. Loricata. Ploima with a firm elastic cuticle 



