II. , REFERENCES TO THE PLATES AND FIGURES. 59 



Fig. 14. Do. elavate in form, distended with large polyhedral globules. 



Fig. 15. Distal extremity of a thallus of Enterohryus attenuatus, with a short secondary cell. 

 a. Portion of the primary cell, filled with protoplasma, granules, and a few globules. 

 h. Secondary cell, burst at its upper extremity, and allowing globules of the protoplasma and granules 

 to escape. 

 Fig. 16. Distal extremity of an individual with a longer secondary cell. 

 a. Portion of the primary cell, with granules and a few globules. 

 h. Secondary cell filled with protoplasma, containing a few scattering granules. 

 Figs. 15 and 16 are representations of the only two instances of secondary cells which I ever observed 

 in Enterohryus attenuatus. 



Fig. 17 represents the distal portion of a number of individuals of Enterohryus attenuatus, exhibiting 

 the variations of the interior structure. 



a. Distended with globules, varying in size in different individuals, but very uniform in the same indi- 

 vidual. 

 h. Filled with granules and globules irregular in size. 



c. Outline of a portion of the primary cell. 



d. Thickening of the cell-wall around the margin of the free extremity. 



PLATE IV. 



Fig. 1. A dead thallus of Enterohryus elegans. 



a. The pedicle. 



b. The primary cell. 



c. The contracted or shrunken primordial utricle. 



d. Oil-like globules. 



e. Branches of Cladophytum. 



Fig. 2. Distal extremity of a thallus, with the contents shrunken from the application of acetic acid. 



Fig. 3. Spores? of Enterohryus elegans. 



Figs. 4-17. Young thalli of Enterohryus elegans. 



Fig. 4. Very young condition: Length jJg-g inch. 



a. Point of attachment. 

 Figs. 5, 6. Further advanced : Length ji^ inch. 



a. Young primary cell. 



h. Pedicle. 

 Fig. 7. Young thallus constricted at the middle: Length jlj inch; breadth ^^ij^ inch. 

 Fig. 8. Young thallus: Length -g^-g inch; breadth -joW i"^"^- 



a. Pedicle. 

 Fig. 9. Do. constricted at the lower portion of the primary cell, which is filled with protoplasma, granules, 

 and a few globules : Length -^^^ inch. 



Fig. 10. Do. curved, elavate, distended with globules : Length -ji^ inch. 



Fig. 11. Do. same form as last : Length ^L inch. 



Fig. 12. Do. Jj inch long. 



Fig. 13. Do. straight, elavate, distended with globules: Length yi^- inch. 



Fig. 14. Do. long, straight, and elavate: Length Jj- inch. 



Fig. 15. Do. constricted at its upper third: Length J^ inch. 



a. Pedicle. 



h. Epithelial cells of the mucous membrane. 

 Fig. 16. Three young thalli growing from a portion of mucous membrane, from a young Julus margina- 

 tus, one inch long. 



a. Primary cell, filled with globules : Length ^^ inch. 



h. Do. elavate in form : Length ^i^ inch. 



c. Do. overgrown with Arthromitus : Length j^-g inch. 



d. Cladophytum. 



