262 F. W. GAMBLE, B.SC. 



Fig. 4. — Cylindrostoma inerme (Hallez). Length 1 mm. The drawing is made 

 from a specimen slightly compressed. Zeiss obj. C, oc. 4, cam. luc. X 55. 



Fig. 5. — Macrorhynchus Naegelii, Koll. Length 2 - 2 mm. This is a colour 

 variety similar to what Claparede observed at St. Yaaste (see p. 206) x 30. 



Fig. 6. — Promesostoma lenticulatum (O. Sch.). Natural length "5 mm. The 

 carmine-coloured gut is visible.- x 103. 



Fig. 7. — Enlero stoma austriacum, Grrff. Natural length '75 mm. The 

 yellow colour is due to groups of pigment-granules, the black spot to the 

 contents of the intestine. X 40. 



Fig 8. — Provortex rubrobacillus, n. sp. Natural length '6 mm. The brown 

 spots are due to the contents of the gut-cells, x 70. 



Fig. 9. — Fovia affinis (Oe.) (probably Uteriporus vulgaris, Bergental). Natural 

 length 45 mm. The figure is carefully drawn from a freely-moving specimen. 

 The slight lobes of the anterior margin are seen when the animal is viewed 

 from below and in front ; this view also shows a slight median projection — 

 similar, in fact, to what occurs in Convoluta jparadoxa. x 8. 



Fig. 10. — Promesostoma marmoratum (Schultze). Natural length 1*5 mm. 

 X 20. 



PLATE XI. 



Fig. 11. — Plagiostoma dioicum, Metschff. Natural length '6 mm. Com- 

 pression-preparation, x 200. 



Fig. 12. — Provortex rubrobacillus, n. sp. Natural length - 6 mm. Compression- 

 preparation, x 150. 



Fig. 13. — Promesostoma lenticulatum (O. Sch.) Compression-preparation, 

 x 150. Concerning the organs marked R. S. and B. C. see p. 199. 



Fig. 14. — Promesostoma agile (Lev.). Natural length '5 mm. Compression- 

 preparation, x 220. 



Fig. 15. — Vesicula granulorum and its chitinous investment taken from 

 Macrorhynchus Naegelii, Koll. The thickened margin is produced into two 

 curved " spurs." As a rule only one is present, x 220. 



Fig. 16. — Copulatory organ of Promesostoma marmoratum (Schultze) (partly 

 after v. Graff), x 200. 



Fig. 17. — Copulatory organ of Promesostoma lenticulatum. x 600. 



Fig. 18. — Automolos (?) ophiocephalus (0. Sch.). The living animal fully 

 extended, x 40. 



PLATE XII. 



Fig. 19. — Hinder portion of Cylindrostoma elongatum, Lev., to show the 

 relations of the genital apparatus, x 500. 



Fig. 20.— Plagiost oma sulphureum, Grff . Natural length 2 mm. Compression- 

 preparation, x 70. 



Fig. 21. — Automolos horridos, n. sp. Natural length T5 mm. Compression- 

 preparation, x 100. 



