7 (6) Rhammites absent 



7 (6) Rhammites present (see Figs. 17, 18) 



10 



8 (7) Wreath of large cells present around the mouth (Fig. 14) 



. Genus Myopea. 



Figure 14. — Myopea crassula: a-dorsal view; b-sec(ion through mouth and pharynx; c-male and female accessory organs. 



(7) No wreath around the mouth although glandular epithelium of the pharynx may vary in thickness 



9 (8) Seminal bursa present (Fig. 15) (see also Fig. 13) 



. Genus Oligofilomorpha. 



Figure 15. — Oligofilomorpha karlingi. 



9(5) Seminal bursa absent (Fig. 16) 



. Genus Solenofdomorpha. 



Figure 16. — Solenofilomorpha longissima. 

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