No. 478] 



OHIO NAIDID.E 



703 



Prostomium either roiiiuled, j)()iiitf(l. oi- dcx doped into ca short 

 tentacular process. Dorsal bundle l)eginuinu' on the 2d scirtnent, 

 composed of capilliform, or needle-like, and l)iuji( inate svUv. \'en- 

 tral bundle composed of biuncinate sette. 



Fresh water. Middle Europe, East India. North America, and 

 South America; six species. 



B\ Number of sogmonts composing an iiidividu.'il u>ually i.") to 30 

 (32 to 40, N. lideym). Biuncinate scr:r in dors;,! l.undlc 

 C^ Prostomium rounded or pointed, sp.^ir. -mall. n.,t rx.vcding 

 5 mm. in length. 



Naidium osborni n. -i-. 



Prostomium moderaielv loim', sonicu lia! pointed. Eye.s ab.sent- 

 Digestive diirrreniiatcd into pharuix M-ments 1 to -3), 



esopha,o-us M-uirni-. I lo 7 . and M<.niarii stli M-unu'Ut). Dorsal 

 bundleOf M-la- Ix-iimin^ on thr Jd ^vi:\\\ru\ . .■oniposed of 1 \ox\^ 



