36 [April, 



bryus elegaiis from the mucous membrane of the posterior portion of the rectum 

 of Julus marginatus. 



Kemarks. Since I established the genus Arthromitns* I have observed the 

 formation of its sporuli. These originate in the amorphous matter of the 

 articuli, apparently by a very gradual aggregation and condensation of the 

 contents. They are always single, and usually lie oblique, and frequently 

 alternate vi'ith each other in this position in the different articuli. When 

 they first appear they are larger than when fully formed, are frequently 

 bent, or clavate in form, and very indistmct, but as they ripen they become more 

 regular, oval, distinct, and quite refractile of light. Usually they are observed 

 at the extremity of the filaments only, but frequently they are found existing in 

 the whole length of the latter. 



A species of Arthromitus, and also of Cladophytum is found in the intestine 

 of Polydesmus virginiensis. 



The Higrocrocis intestinalis found by Valentin in the Blatta orientalis, I could 

 not find in our domestic cockroach, although I found numerous simple, phytoid, 

 inarticulate filaments, growing from an oxyuris infesting this animal. 



The committee on Dr. Leidy's paper, describing some new American 

 Annelida abranchia, reported in favor of publication in the Journal. 



The following amendment to Art. 1, Chapter 6th, of the By-Laws, 

 proposed by Mr. Moss, was adopted : 



"There shall be sixteen standing committees," (instead of fifteen.) 



The object in the amendment being to make the Committees on 

 Geology and Mineralogy distinct. 



*Proc. Acad. Oct. 9th, 1S49. 



