11.- - A FLORA WITHIN ANIMALS. 19 



cular .sacculi, are relllti^•el3' of considerable length, measuring from the 400th to 

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

 others measure the llo4th of an inch in lenoth. 



At the termination of the saccular structure posteriorly, tlie 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 tliin, yellowish, corneous annulus. 



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

 cular than the proventriculus, and pcrfoi'uis nearly the complete circuit of the 

 abdomen in its course to the anus. 



§ 3. Description of the Genus and Species of Enterobrtus. 



E.^'TEKOSIKYUS, Leidy. 



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

 granules and globules, producing at its free exti'emity one, usually two, rarely 

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

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

 attachment. 



1. Eulcrol>rj'8!s elegaBss, Leidy. 



Proc. Acad. Nat. Sc'i., Phila., iv., 225. 



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



Tlinlhis olive brown, brownish, j-cllowish, 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 llexuo.'^e 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. P/incqxd 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 sliorter than the last, cylindroid, clavate, 

 curved, obtusely rounded at the extremity. 



Whole length, 2 to 3 lines. Length of pedicle t^^^-^j to ^^q of an inch; breadth 

 sAo to the j-^^-g of an inch. Breadth of principal cell, the ^ J- of an inch. 

 Length of penultimate cell, y^^ to the -gV of an inch; breadth, j-^-^ to ^1-^ inch. 

 Length of terminal cell, j^q to jij inch; breadth, -joVo to g^-^ inch. 



Habitation. Parasitic, sirowino; from the basement-membrane of the mucous 

 membrane of the small and large intestine o'i Julns murt/inatus, Say; and from any 

 part of the exterior of Ascaris in/ecta, Streptostoiniim affile, and Thelastcnnum atlenua- 

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



