1 9 i4l THAXTER— FUNGUS-PA RA SITES 249 



from 



seldom 



somewhat 



Its 



insertion is an opaque black crustlike structure, from which large 



in a dense tuft. Only a portion of this 



filaments 



figu 



Chantransiopsis Xantholini, nov. sp. — Plate XVIII, figs. 14-16 



Filaments somewhat densely tufted, sometimes rather copi- 

 ously branched; erect, slightly flexed, arising from a small and 

 well defined opaque black foot. Spores relatively small, ovoid to 

 oblong, 10-18X5-6//. Filaments 70-175X5-7 m- 



On the inferior surface of the thorax of Xantholinus obsidiunus, Fresh 

 Pond, Cambridge. 



This species is smaller in all respects than the two preceding 

 forms. The outline of the successive cells tends to become slightly 

 convex, and the spores are rather short and stout. The species 

 has been collected but twice, in October 1900, and again in 1902 

 in the same locality; but although it has been repeatedly sought 

 for elsewhere, it has not again been met with, and may be regarded 

 as very rare. 



A small tuft of a different species has also been observed on 

 a species of Xantholinus from the Philippine Islands, but the 

 specimen is not sufficient for description. 



Amphoromorpha, nov. gen. 



Entomophilous; consisting of two superposed cells surrounded 

 by a firm common envelope, which becomes perforate at the apex 

 for the escape of numerous naked amoeboid ( ?) spores into which 

 the upper cell becomes completely divided; the base attached to 

 the host by a well developed blackened foot. 



The position of this genus is quite uncertain. It is known only 

 in its fully mature condition, the characteristics of which seem to 

 correspond more closely to those of some of the Mycochytridineae 

 than of any other organisms. The spores, into which the upper of 

 the two cells appears to divide in toto, seem to possess no walls, 



