RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. lyi 



after the examination of certain details, which he hoped soon to 

 have the opportunity of making. 



If our two parasitic mites are identical with those of European 

 mussels, it not only makes it appear probable that they are of com- 

 mon origin, but renders it the more probable that this is likewise 

 the case with their hosts, even if these are not regarded as of the 

 same species. 



Professor Leidy also exhibited a collection of body-lice, Pedicuhis 

 vestimcnti, from Jews of Odessa, Russia, presented by Dr. A. G. 

 Stratton. They range in size from 1.25 to 3.875 mm. in length, and 

 appear in no respect to differ from those found on natives of our own 

 country. 



[November. 1883. No. 513. See Bibliography.] 

 MANAYUNKIA SPECIOSA. 



At the time of the discovery of the pretty polyzoan, UrnatcUa 

 gnicillis, of which a description is now in course of publication in 

 the Journal of the Academy, I found an equally interesting little 

 annelide, of which I gave a brief notice in 1858, published in the 

 Proceedings for that year, page 90, under the name of Mmiayunkia 

 speciosa. The two were found in company together, attached to some 

 stones, in the Schuylkill River, at Fairmount, Philadelphia. They 

 seem fitting associates, for while UrnatcUa is nearly related with the 

 marine Pcdicellina, Ma7iayinikia is closely related with the marine 

 annelide Fabricia. Manayiinkia has proved to be less frequent than 

 UrnatcUa, nor have I found it elsewhere than in the locality named. 

 Recently several specimens were submitted to my examination by 

 our fellow-member, Mr. Edward Potts, who found them attached to 

 a fragment of pine bark in Egg Harbor River, New Jersey. Inde- 

 pendent of the interest of finding the worm in a new locality, the 

 .specimens have enabled me to complete an investigation of the animal 

 so far as to prepare the following description, though I have to re- 

 gret that the material has been insufficient to allow me to clear up 

 several important points. I have had the opportunity of comparing 

 Manayunkia with a species of Fabricia living on our coast, and have 

 found the two to be so nearly alike that I am prepared to hear it 

 (luestioned whether the former should be regarded as generically 

 distinct from the latter. 



ManayiDikia forms a tube of mud, which it occupies. The tube 

 is composed of the finest particles, aglutinated by a mucoid secretion 

 of the worm. It is cylindrical, straight or bent, mostly even or 



