Piates I— II. 



Fig. 1. Female Spiroptera. Natural size. 



— 2. Male Spiroptera. Natural size. 



— 3. Part of the in nersurface of a stomach. The epithelium of the fundus containing two 



spiroptera, no pathological changes. 

 -- 4. Spiroptera imbedded in the epithelium of the fundus of the stomach. 



— 6. Transverse section of a gullet containing spiroptera. 



— 6. Spiroptera in the epithelium of the fundus of the stomach. 



— 8. Ripe eggs of the Spiroptera. x ^*"/i- 



— 9. Larva of a Spiroptera in its capsule, imbedded in the muscles of a cockroach. 



— 10. Tuberous tumour in the stomach of a rat, infectod with Spiroptera. 



— 11. Enorraous papillomatous tumour in the stomach of a wild rat from sugar-refinery. Na- 



tural size. 



— 12. Transverse section of the same stomach. x Vi- 



— 13. Carcinomatous tumour in the fundus of the stomach. Black and white rat fed on cock- 



roaches (P. americana). Natural size. 



— 14. Carcinomatous tumour in the ventral wall of the fundus of a black and white rat, fed on 



cockroaches (P. orientalis). High power. 



— 15. Carcinomatous tumour in the ventral wall of the fundns of a black and white rat, fed on 



cockroaches (P. americana). High power. 



— 16. Metastases in a retroperitoneal lymphatic gland of a black and white rat, fed on cock- 



roaches (P.ame-ricana) X ^-'/i- 



(The flgures 2 — 16 have been published before in „Zeitschrift fiir Krebsforschung" 1913, the 

 figures 11, 13, 15 og 16 in „Berliner klinische Wochenschrift" 1913.) 



