136 VEGETABLE PAKASITES. 



tirely of free sporidia, and some fibres with the appearance of 

 rows of globules. 



Hannover says that previous to the establishment of the 

 disease or the destruction of the eye in this case, there must 

 have been the introduction of a spore of the plant through some 

 pervious point in the cornea. 



On account of the similarity of this plant to the ferment-alga 

 or fungus, I have introduced it here. Hannover and others 

 believe that these observations are important in relation to the 

 explanation of the very diverse and puzzling forms of scleromata. 



X. Oscillaria Intestini. 



Sub-order Tiloblasteae. " Alga trichomatica. Trichomata ex 

 cellularum seriebus composita, aut in substantia communi inclusa, 

 aut in substantia communi, gelinea, matricali, amorpha et continua 

 nidulantia" 



Family Oscillariea ; " Trichomata motu proprio spirali pra- 

 dita. Propagatio ex cellulis vegetativis ; cellule spermatic pro- 

 price nulla." 



Genus Oscillaria. Trichomata articulata socialiter crescen- 

 tia, muco communi, matricali, mollissimo vel subliquido, continuo et 

 amorpho, vel in tubulos utrinque apertos, vaginiformes, liberos con- 

 tract o, inclusa. 



Species Oscillaria Intestini. 



This parasite is composed of a number of elongated filaments, 

 with partition walls which cross each other in all directions. 

 Each of the cells is considerably elongated and contains a quan- 

 tity of green matter. According to Farre the spores of this 

 alga must have been taken into the intestinal canal by drinking 

 water. He found it enveloped in membranous reddish masses, 

 brought away during an attack of colic in a dyspeptic woman. 



Literature. Arthur Farre, On the minute structure of certain 

 substances expelled from the human intestine, having the ordi- 

 nary appearance of shreds of lymph, but consisting entirely of 

 filaments of a confervoid type, probably belonging to the genus 

 Oscillatoria, ' Trans. Microscopical Society/ vol. i, p. 92, pi. xi b 

 Robin, 1. c., pp. 404, 405. 



I have not seen the plate of Farre's Conferva, but the species 

 described under the genus Leptomitus are only superficially 



