16 



BULLETIN : MUSEUM. OF COMPARATIVE ZOOLOGY. 



EXPLANATION OF THE PLATE. 



ABBREVIATIONS. 



The lines adjacent to the Figures 1, 2, and 4-7 indicate the natural size of the 

 object. 



Fig. 1. DendroccElum lacteum. From life, X 4. 



Fig. 2. Planaria maculata. From life, X 6. 



Fig. 3. P. maculata. Head end, to show the occurrence of the light median streak. 



From life. 

 Fig. 4. Planaria dorotocephala, sp. nov. From life, X 7. The line at tlie left of 

 the figure indicates the natural size of the colored part of tiie figure 

 only. 

 Fig. 5. Planaria gonocephala. From life, X 5. 



Fig. 6. Mesostoma elirenbergii, showing young worms in the left uterus. From 

 a specimen in clove oil, X 14. 

 P. dorotocephala, sp. nov., to show intestinal tract. A reconstruction from 



a series of frontal sections, X 6. 

 Planaria unionicola, sp. nov. From a drawing, apparently from life, 



accompanying the specimen. 

 D lacteum. Head end, to show the adhesive organ. From an alcoholic 



specimen killed in corrosive sublimate, X 5. 

 D. lacteum. Diagram of sexual organs, X 20. 

 Fig. 11. D. lacteum. Longitudinal section to show the sexual organs, X 50. 

 Fig. 12. D. lacteum. Transverse section through penis, X 40. 



D. lacteum. Transverse section through extreme anterior end, to show 



the adhesive organ, X 80. 

 D. lacteum. Transverse section from same individual as last, somewhat 



posterior to it, X 80. 

 D. lacteum. Median longitudinal section through the anterior end and 

 adhesive organ, X 80. 



Fig. 7. 



Fig. 8. 



Fig. 9. 



Fig. 10. 

 Fig. 11. 

 Fig. 12. 

 Fig. 13. 



Fig. 14. 



Fig. 15. 



