II. A FLORA WITHIN ANIiMALS. 19 



cular sacculi, are relatively of considerable length, measuring from the 400th to 

 the 125th of an inch in length, by the 3000th of an inch thick, while the 

 others measure the 1154th of an inch in length. 



At the termination of the saccular structure posteriorly, the lining membrane of 

 the ventriculus is provided with a single transverse row of six broad, V-shaped 

 corneous plates (Fig. 10, d), followed, after a short interval at the junction of the 

 organ with the fecal intestine, by a thin, yellowish, corneous annulus. 



The fecal intestine (Fig. 8, c) is cylindrical, narrower, and more strongly mus- 

 cular than the proventriculus, and performs nearly the complete circuit of the 

 abdomen in its course to the anus. 



3. DESCRIPTION OF THE GENUS AND SPECIES OF ENTEROBRYUS. 

 ENTEROBRYIJS, LEIDY. 



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

 granules and globules, producing at its free extremity one, usually two, rarely 

 three, shorter tubular cells, and growing at the other end from a relatively short, 

 cylindroid, amorphous, coriaceous pedicle, commencing with a discoidal surface of 

 attachment. 



1. Enterobryus elegans, LEIDY. 



Proc. Acad. Nat, Sci., Phila., iv., 225. 



(PLATE I. Fig. 1 ; II. ; III. Figs. 1-14; IV. Figs. 1-25, 28.) 



Thallus olive brown, brownish, yellowdsh, or colorless, transparent, cylindrical, 

 usually somewhat clavate at the free end; at first forming a single spiral turn, and 

 then proceeding in a straight or gently flexuose curved line to the free extremity. 

 Pedicle variable in length to that of the thallus, cylindroid, more or less transversely 

 contorted, finely striated longitudinally, uniformly brownish in color, commencing 

 in a broad discoidal expansion. Principal cell very long, cylindrical, slightly dilated 

 at the commencement, and usually more so, or somewhat clavate at the free end. 

 Penultimate cell cylindrical. Terminal cell shorter than the last, cylindroid, clavate, 

 curved, obtusely rounded at the extremity. 



Whole length, 2 to 3 lines. Length of pedicle ^iVo to T -J T of an inch ; breadth 

 szW t the ys^g- of an inch. Breadth of principal cell, the 7 7 of an inch. 

 Length of penultimate cell, yJ 7 to the -fa of an inch; breadth, y^V-j- to ^| 7 inch. 

 Length of terminal cell, T T to T 7 inch ; breadth, j-fa-Q to ^ T inch. 



Habitation. Parasitic, growing from the basement-membrane of the mucous 

 membrane of the small and large intestine of Julus marginatus, Say ; and from any 

 part of the exterior of Ascaris infecta, Streptostomum agile, and Thelastomum attenua- 

 tum : entozoa infesting the cavities of the viscera, just mentioned. 



