n. A FLORA WITHIN ANIMALS. 37 



Julus marginatus. It is also not unfrequently found parasitic upon Eccrina lomja, 

 growing in the same manner as upon Enterohrijus elerjans. 



Within the ventriculus of Passalus cornutus, 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 Enterobnjus attermatus. 



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



CliADOPHYTCITI, Leidy. 



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

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



1. Cladophytuui coiuatuiii, Leidy. 



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



Cladophyfum ranwsissimum, Leidy: Ibid., iv., 250. 



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



2 e, 6, 7, 8.) 



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

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

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

 from the ^|^ to the ^^ of an inch. 



Habitation. — Parasitic, in the same positions with Arth-omitus. 



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



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

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

 mediate forms which indicate them to be the same. 



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

 observed. It is very hcteromorphous 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^^ to the j J ^ of an inch in length, by the 30^00 t^ the g-^^u o" of ^^ 

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

 ramuli do not measure more than the -j 0*0 0^ ^^ ^^^ to'tto ^^ ^^ mah. in length. It 

 is also commonly observed, more or less branching, from the ^^^ to the ^'^ of an 

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

 6 



