280 THAXTER. 



quite differently from different points of view, and through secondary 

 displacement and the presence of a dorsal outgrowth of its third cell, 

 the original cell-arrangement is often difficult to recognize. 



Dimeromyces lobatus nov. sp. 



Male individual consising of three cells; the basal abruptly more 

 than twice as broad distally, forming a shelf on which the broad flat 

 subbasal cell rests; the third cell narrower: appendage erect, terminal, 

 its basal cell undifferentiated, slightly narrower distally, separated 

 from the subbasal by a somewhat constricted deep reddish cup-like 

 septum, the distal portion two-celled, tapering to a blunt point. 

 Antheridium arising from the third cell of the receptacle, sometimes 

 also from the second, parallel to and in close contact with the ap- 

 pendage, the neck rather long and stout, slightly curved outward, 

 subtended by a slight prominence above the somewhat inflated but 

 narrow venter. Total length, including foot (18 ju), 65 /jl. Basal 

 cell X 8 M below and X 14-16 m distally. 



Female individual. Receptacle four-celled, otherwise similar to 

 that of the male, the basal cell of the primary terminal appendage 

 undifferentiated, the subbasal distinguished by a more conspicuous 

 constriction and dark septum. Secondary appendages arising from 

 the second and fourth cells, the latter tapering, subhyaline, distin- 

 guished above its somewhat rounded basal cell by a dark septum; the 

 former large, externally and distalh^ tinged with deep blackish brown; 

 its basal cell somewhat rounded, separated from the subbasal by a 

 constriction and broad black septum: straight, slightly divergent, 

 five-celled; the terminal cell producing three or four short, stout, 

 recurved, deep brown branchlets or lobes. Perithecium arising from 

 the third cell, the stalk well developed (the ascigerous region imma- 

 ture). Primary appendage 25-50 ^i; lower secondary, 40-50 ^t. 

 Receptacle, including foot, 40-50 /x. 



On forceps of Echinosoma Congolense Bor. No. 3104, Kamerun. 



Owing to the fact that the perithecia are immature, I have described 

 this species with reluctance. Its peculiarities are such, however, 

 that it is not likely to l)e confounded with any other, the lobed branch- 

 ing of the distal cell of its loAver secondary appendage being unique. 

 The males are mature and peculiar. About twenty specimens have 

 been examined. 



