TIIAXTER. RICKIA AND TREN'OMYCES. 373 



primary appeiulage; the sixth cell of the anterior series j)r()(hicing 

 neither appendage nor aiitheridiuni. Appendages subcylindrical, 

 several times as long as l)r()a<l, faintly snfl'used aho^-e the consi)ieuous 

 blackened slightly constricted base. Median series consisting of 

 five cells successively smaller from below upward, the three lower 

 rounded, the uppermost triangular, its upper face free below the 

 slightly projecting truncate or bluntly rounded free tip of the peri- 

 thecium. The latter otherwise completely enclosed, vertical or slightly 

 oblique, and lying almost wholly anterior to the median axis. Peri- 

 thecium 60 x'25/x. Body 90-100 X 78-85 m- Basal cell including 

 foot 28-35 X 15-18 m- Appendages 24-35 X 5 /x. Projecting an- 

 theridia 12 jjl. 



On a minute mite. Kamerun, No. 2441. 



A very minute form characteristic from its oljcordate almost sym- 

 metrical form and radiating antheridia and appendages. 



Rickia elliptica nov. sp. 



Hyaline, elliptical to nearly circular in outline. Basal cell very 

 short, sometimes entirely included in the angle between the inner 

 surfaces of the basal cells of the marginal rows, the foot, only, project- 

 ing beyond the general outline of the main body. Anterior marginal 

 row consisting of from five to eight cells subradially elongated, the 

 two uppermost extending downward to sharp points, all or nearly all 

 cutting off distally a small triangular appendiculate cell; the append- 

 age which terminates the distal cell appressed against the free 

 anterior face of the tip of the perithecium: posterior marginal row 

 consisting of from seven to nine cells, similar to the anterior series 

 except that the upper cells are smaller, the uppermost much smaller, 

 bearing distally the basal cell of the primary appendage which is 

 small, narrow, free, not greatly longer than the subtending cell of 

 the very small appendage; other appendages stouter, short, irregu- 

 lar with slightly suffused bases. Median series of six to eight cells, 

 one to three of the terminal ones externally free above the basal cell 

 of the primary appendage, the successive cells subisodiametric, some- 

 what irregular in outline, and not greatly differing in size. Peri- 

 thecium almost wholly inclosed, the tip free externally, slightly 

 bent outward below the apex which is subtended on its inner side 

 by an erect finger-like upgrowth, geniculate at its base; body of the 

 perithecium rather long and narrow, subsymmetrical. Spores (in 

 perithecium) 22 X 2.5 m- Perithecium 30-40 X 10-12 m, not includ- 



