1 6 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



the same surface at the commencement of the large intestine, from 

 any part of the exterior surface of entozoa infesting those cavities, 

 and also from any part of the surface of Enterobrus elegans. 



Arthromitus^^ a second new genus of entophyta, allied to the 

 Mycodermata. — Filaments always simple, cylindric, articulated, 

 without ramuli, attached by means of a nuclear body, and with no 

 evidence of interior structure. 



Arthromitus cristatiis. — Filaments delicate, straight or inflected, 

 growing in tufts usually of moderate density, from minute, attached, 

 yellowish rounded or oval nuclear bodies. Articuli short, cylindric, 

 uniform, measuring i-qogoth inch in length by i-r 5,000th in breadth, 

 with no traces of interior structure. 



Length i -375th to i-46th of an inch, breadth i- 15,000th inch. 



Habitat. — Same as Cladophytum comatiim, but rarely growing in 

 such dense tufts. 



The three genera of entophyta of which I have now spoken are 

 all so constantly found in Juhcs marginatus that I look upon it as a 

 natural condition, and should I hereafter meet with an individual 

 without them, I will consider it a rare exception, because in one 

 hundred and sixteen individuals which I have examined during the 

 past thirteen months, in all seasons, and at all ages and sizes of from 

 one up to three inches of the animal, I have invariably found them. 

 It cannot be supposed that these are developed and grow after death, 

 because I found them always immediately upon killing the animal. 

 Whilst the legs of fragments of the animals were yet moving upon 

 my table, or one-half of the body even walking, I have frequently 

 been examining the plants growing upon part of the intestinal canal 

 of the same individual. And upon the entozoa these entophyta will 

 be frequently found growing, whilst the former are actively moving 

 about. I found among others an ascaris three lines long, which had 

 no less than twenty-three individuals of Enterobrus, averaging a line 

 in length, besides a quantity of the other two genera, growing upon 

 it, and yet it moved about in so lively a manner that it did not ap- 

 pear the least incommoded by its load of vegetation. This specimen 

 I have preserved in a glass cell in Goadbj^'s solution, and exhibit it 

 to the Academy. 



The animals were uniformly enjoying good health, /. c, all the 

 organic and animal functions were natural ; they ate, grew, reached 

 their definite size, reproduced, and in fact presented all those actions 

 characteristic of the normal state of existence of the animal. 



Arthromitus : — A?6?oy et /mto?. 



