II. REFERENCES TO THE PLATES AND FIGURES. 59 



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



Fig. 15. Distal extremity of a thallus of Enteroiryns atlcnnatas, with a short secondary cell. 



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



I. 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. 



b. 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 Enterobryus attenvatus. 



Fig. 17 represents the distal portion of a number of individuals of Enterobryus attcnuatua, 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. 



b. 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 Enterobryus cleijans. 



a. The pedicle. 



b. The primary cell. 



c. The contracted or shrunken primordial utricle. 



d. Oil-like globules. 



e. Branches of Cladopliytum. 



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

 Fig. 3. Spores? of Enterobryus elegant. 

 Figs. 417. Young thalli of Enterobryus eleyans. 

 Fig. 4. Very young condition : Length TJ Vo inch- 

 es. Point of attachment. 

 Figs. 5, 6. Further advanced : Length ? i ff inch. 



a. Young primary cell. 



b. Pedicle. 



Fig. 7. Young thallus constricted at the middle: Length 5 -|j inch; breadth -j^j inch. 

 Fig. 8. Young thallus: Length j-J-j- inch; breadth T?f V<y i ncn - 



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 T J 5 inch. 



Fig. 10. Do. curved, clavate, distended with globules : Length T i 5 inch. 



Fig. 11. Do. same form as last: Length jL inch. 



Fig. 12. Do. 7 'j inch long. 



Fig. 13. Do. straight, clavate, distended with globules : Length T | T inch. 



Fig. 14. Do. long, straight, and clavate : Length J v inch. 



Fig. 15. Do. constricted at its upper third: Length ? L inch. 



a. Pedicle. 



b. Epithelial cells of the mucous membrane. 



Fig. 16. Three young thalli growing from a portidn of mucous membrane, from a young Jului margina- 

 tus, one inch long. 



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



b. Do. clavate in form : Length 5 | 5 inch. 



c. Do. overgrown with Arthromitus : Length T i 5 inch. 



d. Cladiifliytum. 



