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DESCRIPTIONS OF THE PLATES. 



DESCRIPTION OF PLATE V. 



DimorpJtomyces muticus Thaxter. 



Fig. 1. An old female individual in which four new perithecia are developing. One of the two 

 primary perithecia is shown projecting to the left, and within it two fully developed male individuals. 

 Posterior view. D 4. 



Fig. 2. Male and female individuals in situ on edge of portion of abdominal ring of host. The 

 male at the left ; both viewed posteriorly and illustrating the juxtaposition of the sexes at the point 

 of infection. The ascus group shown in left perithecium. D 4. 



Fig. 3. Mature female individual with but two perithecia seen in optical section with ascus 

 groups. Anterior view. U 4. 



Fig. 4. Young female individual seen sidewise, its posterior face with the sterile terminal cells 

 of the receptacle at the right. Of the two young perithecia the larger bears a terminal branched 

 trichogyne, to which several antherozoids are affixed. D 12. 



Fig. 5. Male and female individual developed from the same spore pair at the point of infection. 

 The female at the right has two young perithecia with terminal trichogynes on which are several 

 antherozoids. Posterior views. D 12. 



Fig. 6. Young female individual seen sideways. • D 12. 



Fig. 7. Tip of perithecium. D 12. 



Figs. 8 and 9. Two mature male individuals showing discharge of antherozoids. D 12. 

 Fig. 10. Spore. D 12. 



Dimorphomyces denticulatus Thaxter. 

 Fig. 11. Mature female individual. View in part anterior. D 4. 



Fig. 12. Mature female individual seen posteriorly, a third young perithecium' projecting at the 

 right. D 4. 



Fig. 13. Tip of perithecium. D 12. 



Figs. 14 and 15. Two male individuals with antherozoids. D 12. 

 Fig. 16. Spore. D 12. 



Amorphomyces Falagrice Thaxter. 



Fig. 17. Male and female individual developed from the same spore pair at the point of 

 infection. The perithecium of the female shown in optical section with the nucleated asci arising 

 from the long ascogenic cell at the left. The ascus mass is viewed obliquely sidewise. The spore 

 mass in the terminal portion of the perithecium consists of spore pairs freed through the absorption 

 of the ascus walls. D 4. 



Fig. 18. Female individual viewed anteriorly. The asci are shown arising alternately in a 

 double row from the ascogenic cell, which lies behind. D 4. 



Fig. 19. Mature female individual viewed sidewise. Many of the spore pairs in the terminal 

 portion have begun to germinate, their blackened haustoria directed upward. D 4. 



Fig. 20. Male and female individuals developed from the same spore pair. The female at the 

 left terminated by a branching trichogyne, the carpogonium and trichophoric cell both distinctly 

 nucleolated. The male at the right shows antherozoids before discharge. D 12. 



