528 F. W. GAMBLE. 



PLATE XL. 



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

 Compression-preparation, x 200. 



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

 Compression-preparation. x 150. 



Fig. 13. — Promesostoma lenticulatum (0. Sch.). Compression-pre- 

 paration. X 150. Concerning the organs marked R. s. and B. C. see p. 454. 



Fig. 14. — Promesostoma agile (Lev.). Natural length "5 mm. Com- 

 pression-preparation. X 220. 



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

 from Macro rhynchus Naegelii, K611. The thickened margin is produced 

 into tvro 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 XLI. 



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

 the relations of the genital apparatus, x 500. 



Fig. 20. — Plagiostoma sulphureum, Grff. Natural length 2 mm. 

 Compression-preparation. X 70. 



Fig. 21. — Automolos horridus, n. sp. Natural length 1"5 mm. Com- 

 pression-preparation. X 100. 



