1850.J 35 



April 30th. 

 Dr. Morton, President, in the Chair. 



The committee to which was referred Dr. Leidy's paper on some 

 new Entophyta, reported in favor of publication in the Proceedings. 



Descriptions of neiu Eiitophyta grotuing within animals. 

 By Joseph Leidy, M. D. 



EccRiNA." (Gen. Nov.) Characters same as EnterobryuSjf except that it 

 divides into numerous cells at the free extremity. 



Eccriiia, longa. Filaments long and delicate, hyaline, or faintly brownish, at 

 first forming a simple curve, or a single spiral turn, and then passing in a straight 

 line to the free extremity. Peduncle very short. Frond cell usually filled with 

 globules, and a few granules, except at free end where it is usually filled with 

 granules to the exclusion of the globules. End cells as high as thirty in number, 

 at first consisting of elongated divisions of the frond cell contents, but becoming 

 distinct elliptical cells, from two to three times longer than the breadth ; content* 

 usually granular, occasionally with a few globules. End cells finally separating 

 from the parent. Length from three to seven lines, breadth l-2000th to the 

 1-5 17th in., not usually corresponding to the length. End cells l-517th to the 

 l-357th in. in length. 



Habitat. Grows in very great profusion from the mucous membrane of the 

 posterior part of the intestine of Polydesmus virginiensis. 



(Dr. L. exhibited to the Academy a preserved fragment of mucous membrane, 

 with filaments of this species six lines in length growing from it.) 



Eccrina moniliforma. Filaments hyaline or yellowish, forming a double or 

 treble spiral. Peduncle short. Frond cell filled with globules and granules, 

 except towards its free extremity, where it is filled with granular matter divided 

 into distinct and separate masses, usually a little shorter than broad, and contain- 

 ing each a globular nucleolated nucleus. Divisions progressively passing towards 

 the end into globular cells with granular contents. Divisions and globular cells 

 from 20 to 50 in number. 



Length from 1 to li lines, breadth average l-1500th in. Divisions of frond 

 cell contents and globular cells from l-1875th l-1500th in. Nucleus of cells 

 1-3750 in. 



Habitat. Gxovis in moderate quantity from the mucous membrane of the 

 intestine of 50 per cent, of Polydesmus granulatus. 



Arthromiius 7iitidus. Filaments very long, hyaline, grows usually in twos or 

 fours, pointed at the origin, rounded at the termination. Articuli very distinct, 

 length equal to the breadth of the filament. Sporuli formed within the articuli, 

 solitary, usually oblique, oval, amorphous. 



Length 1 line by l-5000th in. broad. Spores 1-7. 111th in. long, by l-12.500th 

 in. broad. 



Habitat. Grows in considerable quantity with a profusion of young of Entero- 



Exxptvo segrego. t^roc. Acad. Oct. 9, 1849. 



