It- A FLORA WITHIN ANIMALS. 37 



Julus marginatus. It is also not unfrequently found parasitic upon Eecrina Imiga, 

 growing in the same manner as upon Enterobryus elegans. 



Within the ventriculus of Passalus cornuhis, it grows from any part of the 

 surface, not so abundantly as in Julus marginatus; but, nevertheless, profusely 

 from the hair-like appendages of the cavity, or from the mucous membrane forming 

 the doublings separating the sacculi of the stomach. 



I never observed it parasitic upon Enterobryus attenuatus. 



§ 9. Description of the Genus and Species of Cladophytum. 



CliADOPHYTCM, Leidy. 



Thallus attached by means of one or more granules ; filamentous, simple, with 

 minute lateral ramuli, or branched, inarticulate, amorphous in structure. 



1. Cladophytum comatum, Leidy. 



Proc. Acad. Nat. Sci., Phila., iv., 227. 



• Cladophytum ramosissimum, Leidy: Ibid., iv., 250. 



(Plate II. Fig. 1 h; PI. IV. Figs. 27 d, 28 f; PI. V. Figs. 3/, 14 e; PI. VI. Fig 7/; PI. VIII. Figs. 1 d, 



2 e, 6, 7, 8.) 



Thallus very delicate, linear, colorless, simple, with very minute ramuli, or very 

 much branched, with minute ramuli upon the terminal branches. Pedicle of 

 attachment one or more, amber-colored, spherical, amorphous granules. Length 

 from the -^^-^ to the t^^ of an inch. 



Habitation. — Parasitic, in the same positions with Arthromitus. 



§ 10. History, Structure, etc. of Cladophytum. 



In the preceding description, I have included what I formerly considered to be 

 two distinct species of Cladophytum, as I have since observed a variety of inter- 

 mediate forms which indicate them to be the same. 



Cladophytum is the most minute of the entophyta which I have distinctly 

 observed. It is very heteromorphous in its character, and there may probably be 

 several species ; but the power of the microscope in its present condition is not 

 sufficient to characterize them. 



It always appears colorless, branching, and entirely amorphous in structure. 



Frequently, it is found consisting of simple filaments, with minute simple ramuli 

 from the y^-g- to the j--o o" of an inch in length, by the ■g^Q-^o'o" ^^ ^^^ ■§^to^U¥ of an 

 inch in diameter, growing in more or less dense bunches or tufts (PI. VIII. 6) . The 

 ramuli do not measure more than the -g-oV-o *o ^^^ toV o" of an inch in length. It 

 is also commonly observed, more or less branching, from the ^\-^ to the ^V of an 

 inch in length (PL V. 3, /; 14, e) . The branches are about the i -g-^-g-o of an inch in 

 6 



