II. A FLORA WITHIN ANIMALS. 29 



length, cylindrical, and straight or gently curved. Very frequently it presents a 

 slight geniculate bend, occupying a position generally above the upper fourth or 

 fifth of the thallus. the distal portion being straight or slightly curved, and, most 

 commonly, narrower than the lower portion, the reverse of what is observed in 

 the young of Enterobryus elegans. The contents usually consist of globules. 



The next entophyte, to which I shall direct especial attention, I have named 

 Eccrina, a genus closely allied to Enterobryus, to which, probably, most naturalists 

 would refer it, but which I was led to consider as distinct, first, in the case of Eccrina 

 moniliformis, which at the distal extremity of the thallus produces a very great 

 number of globular secondary cells. The Eccrina longa, originally described as a 

 species of Enterobryus,^ from its also producing numerous secondary cells, though 

 not globular, I afterwards preferred assigning to Eccrina. 



5. DESCRIPTION OF THE GENUS AND SPECIES OF ECCRINA. 

 ECCRINA, LEIDY. 



Thallus attached, consisting of a single very long tubular cell, filled with granules 

 and globules, producing at its free extremity a succession of numerous globular or 

 oblong cells, and growing at the other end from a relatively short, cylindroid, 

 amorphous, coriaceous pedicle, commencing with a discoidal surface of attachment. 



1. Eccrina longa, LEIDY. 



Proc. Acad. Nat. Sci., v., 35. 



(PLATE V. Figs. 1-13.) 



Thallus long, filiform, colorless, or brownish, transparent, cylindrical, usually not 

 holding a constant relation of breadth to the length, forming a simple curve or 

 single spiral turn, and then proceeding in a straight line or gently flexuose curve to 

 the free extremity. Pedicle very short, columnar, expanded at the base. Principal 

 cell very long, uniformly cylindrical. /Secondary cells in various stages of develop- 

 ment from ten to thirty in number, oblong, or short cylindrical, with obtusely 

 rounded extremities when completed. 



Whole length from 2 to 7 lines. Length of pedicle ^-ffVtf * TtW f an inch. 

 Breadth of principal cell, from ^^W * the ^ T of an inch. Length of secondary 

 cells, from the -^-^ to the ^^ of an inch. 



Habitation. Parasitic, growing in profusion from the mucous membrane of the 

 posterior part of the intestinal canal of Polydesmus virginiensis. 



1 Proc. Acad. Nat. Sci., vol. v., p. 9. 



