264 THAXTER. 



by a slightly oblique thin blackish septum. Antheridium somewhat 

 longer than the receptacle and appendage combined, the neck very 

 long and slender, slightly curved. Antheridium 57 X 7.6 /jl. Ap- 

 pendage 19 X 5.5 yu at base. Receptacle without foot, 28 )u. Total 

 length to tip of antheridium 84 ^u. 



Female iudividuat irregularly furcate in habit. Axis consisting of 

 twenty cells, more or less, oblic^uely superposed, the basal much 

 longer and hyaline, or translucent below its distal end, and the cells 

 above it deep red-brown, more or less opaque, becoming dirty yellow- 

 ish translucent brown distally; the series tapering slightly above the 

 middle and ending in a blunt cell without any recognizable primary 

 appendage; the cells bearing rather short, stiff, two- to three-celled 

 secondary appendages, the lower more or less deeply tinged with 

 reddish brown, those above subhy aline; the lowest heterogeneous, 

 deeply suffused, blunt, curved, nearly uniform, of about six hardly 

 distinguishal)le cells; subtended by the single perithecium which 

 arises from the opaque region of the subbasal cell, its short stalk- 

 portion abruptly curved turning the perithecium sidewise and away 

 from the curvature of the axis: the stalk-region not distinguished, 

 the ascigerous region strongly convex distally and externally, the 

 inner margin straight, or slightly concave; the tip abruptly distin- 

 guished by indentations, more abrupt on the inner side, its margins 

 slightly convex; the apex oblique distally and externally rounded 

 and prominent. Perithecia 118-140 X 22-27 //. Basal (hetero- 

 genous) appendage 50-66 X 5-5.7 /x; the rest about 35 X 6 /i. 

 Total length to tip of axis 140-190 m- 



On the inferior surface of the tip of the abdomen of Eleiisis (Isomalus) 

 sp. No. 2359, Kamerun, ^Yest Africa. 



Owing to the fact that the axis of the female in this peculiar species 

 is so turned that it is A'iewed for the most part edgewise, it is very 

 difiicult to obtain a clear idea of its exact structure. It is perhaps 

 more nearly allied to D. Thaxteri, but in the adults, only two of which 

 ha^•e been examined, there is no indication of the presence of a primary 

 appendage and the heterogeneous appendage that is present just above 

 the insertion of the perithecium, seems to have no counterpart in 

 other species. It is possible that the axis is the result of a secondary 

 proliferation, but there are no young individuals from which this might 

 be determined. In general habit it is not unlike a somewhat anoma- 

 lous form of Rhcichomyces. The male has only been seen viewed 

 edgewise, and owing to the partial opacity of the receptacle the 

 characters of the latter cannot be made out with certaintv. The verv 



