50 THAXTER. 



smaller or subequal; each, or the two upper, only, cutting off distally 

 and externally one, rarely two, superposed small cells which bear 

 either short appendages, which are subtended by a blackened septum ; 

 ■or subulate sessile antheridia, not distinguished either by a constric- 

 tion or a blackened septum at the base; the upper cell and its antheri- 

 dia in oblique contact with the base of the perithecium : median series 

 consisting of eight or more, often nine, cells ; the lowest larger, lying 

 below the base of the perithecium, the rest united to its inner margin; 

 the distal one often somewhat larger, the rest rather small, becoming 

 subequal and rounded: posterior series nearly straight or but slightly 

 convex externally, consisting of eight or more, often nine, superposed 

 cells, some or all of which may cut off distally and externally small 

 appendiculate cells bearing subcylindrical usually appressed append- 

 ages; the lowest cell somewhat longer than the corresponding cell of 

 the anterior series, and subtriangular in form; the rest subequal or 

 slightly smaller distally, the series ending in the two-celled base of 

 the primary appendage which may be obliquely or almost horizontally 

 placed, and is thus variably divergent; its upper cell very small, its 

 lower nearly uniform with the other cells of the series, its base opposite 

 the distal cell of the median series. Perithecium erect, tapering from a 

 rather broad base, the outer margin free, slightly concave, the tip 

 slightly distinguished; the apex, only, free on the inner side, slightly 

 bent inward, distally broad, slightly sulcate. Spores about 25 X 

 2.5 fx. Perithecia 45-60 X 18-20 m- Appendages 9-11 X 3 /i- 

 Basal cell 35 X 9 m- Total length to tip of perithecium 90-125 X 

 26-36 M- 



On Parasitus sp.. No. 2796, Mexico, M. C. Z. (Mann). 



Although very different in general appearance, this species is most 

 nearly allied to R. minuta; which is, however, very readily distin- 

 guished by the crest-like curvature of its posterior cell-series and its 

 bladder-like appendages, as well as by other points of difference. 



Rickia Gryllotalpae nov. sp. 



Hyaline, rather elongate, strongly or slightly sinuous, tapering 

 gradually below to the foot. Receptacle triseriate, the basal cell 

 relatively long, slightly intruded distally, slightly and abruptly swollen 

 above the foot: anterior series consisting of ten to eleven subequal 

 cells, somewhat longer than broad, which cut off one or more, often 

 two, almost vertically superposed cells bearing appendages; while the 



