II. A FLORA WITHIN ANIMALS. 21 



found, of the character of villoid appendages. It then occurred to me that if it 

 were a plant, it would probably be also found upon fragments of the ligneous food 

 of the animal within the intestine, which, however, was not the case. On the 

 other hand, I frequently detected it growing from the exterior surface of three 

 species of nematoid entozoa infesting the alimentary canal of Julus marginattis with 

 as much constancy as the plant itself. Among several hundred specimens of these 

 worms, consisting of Ascaris in/ecia, Streptostomum agile, and Thelastomum attenu- 

 aium, which I had obtained from numerous individuals of Julus marginatus, and 

 preserved in alcohol, I found twenty which had from one to a dozen filaments 

 of E)iterohryus attached to their exterior surface. Since then, I have observed 

 that on an average about one in twenty of the entozoa will be found to have the 

 plant growing upon it. In one instance, I found a large individual of Ascaris wfecta, 

 with twenty-three filaments of Enterohryus growing from its surface, which ap- 

 peared to cause no inconvenience to the animal, as it moved and wriggled about 

 with all the ordinary activity of the species (PL VI. Fig. 1). 



The plant rarely reaches its full growth upon the entozoa, although its attach- 

 ment is as firm as upon its ordinary seat, the mucous membrane of the cavity 

 infested by the worms. 



The principal and constant locality of the Enterohryus, and that in which it is 

 most frequently met with in full development, in Julus marginatus, is at the com- 

 mencement of the ventriculus (PL VII. Fig. 21, g). Lower down it is not so abund- 

 ant; nor is it in this position usually of large size. In the large intestine iji), 

 especially at the lower extremity, it frequently exists in the greatest profusion, 

 but always in a very immature condition. 



From the constancy of the presence of Enterohryus elegans within Julus margin- 

 atus, having examined over one hundred of the latter without finding it absent 

 even in a single instance, I was led to suspect its existence within other species of 

 Julus, and accordingly sought for it in Julus pusilhis, a species very much smaller 

 than Julus marginatus. Within this I detected the second and smallest species, the 

 Enterohryus spiralis. 



I found no entozoa within a dozen individuals of Julus pusillus, nor did the 

 Enterohryus always exist in it ; in several there were only two or three filaments ; 

 in two others it grew profusely ; and in two it was not at all present. 



From the occurrence of two species of Enterohryus in the two species of Julus 

 examined, I suspected entophyta would be found very commonly among the 

 Myriapoda. I therefore examined species of Cermatia, Gryptops, Scolopendra, 

 OeopJdlus, &c., but in none of these carnivorous genera did I discover a trace of a 

 parasitic plant. In two species, however, of another genus of herbivorous Myria- 

 poda, Polydesmus granulatus, and Polydesmus virginensis, I found two new and dis- 

 tinct species of entophyta, which I have referred to a different genus from Mitero- 

 hryus, under the name of Eccrina, of which a description will follow hereafter. 



Pursuing my researches after entophyta among insects next, I found none among 

 the Hemiptera, nor the carnivorous Coleoptera, but in our most common, largest 

 4 



