Plate I. 



Fio". 1. — KoiüahvsMa tenuis Fol. Dorsal view of the trunk. 



Fio-, 2, — Ditto. Ventral view of the trimli, with the tail removed. 



Fig. 3. — Ditto. Left side view of the trunk. 



Fis. 4. — Ditto. Posterior view of the tail. 



Fig. 5. — FritiUaria haplostoma Fol. Eight side view of the trunk. 



Fig. 6. — Ditto. Left side view of the anterior portion of the trunk, to 

 show the lip, the oikoplast epithelium, the endostjle and the 

 spiracle. 



Fig. 7. — Ditto. Left side view of the alimentary canal. 



Fig. 8. — Ditto. Dorsal view of the anterior portion of the trunk, to show 

 the lip, the ciliated fassa and the ciliated ring. 



Fig. 9. — FritiUaria pellucida Busch. Left side view of the trunk. 



Fig. 10. — Ditto. Front view of the mouth, to show the lips and its ap- 

 pendages. 



Fig. 11. — Ditto. Dorsal view of the trunk. 



Fig. 12. — Ditto. Ventral view of the alimentary canal and genital glands. 



Fig. 13. — Ditto. Tail with two pairs of large glandular cells ; front view. 



Fig. 14. — FritiUaria haplostoma Fol. Tail from back side. 



