TH.\XTER. — RICKIA AND TREXO.MYCES. 369 



the posterior series, which ends in a minute sufTused roundish hardly 

 distinguishable cell; the inner lip-cell forming a finger-like straight 

 free process. Spores about 25 X 3 /x (in perithecium). Perithecia 30- 

 35 X 8-10.5 M- Basal cell 14-18 X 5-G.5 m- Basal and subtending 

 cell of primary appendage 16-17X7//. Appendages 9X4.5- 

 7 X 6m. Total" length 48-56 X 14-16 /x. 



On a minute mite belonging to a new genus, near Iphiopsis. 

 Trinidad, No. 2440. 



Although there are fourteen specimens of this peculiar species in 

 various stages of development, none of them show any indication of 

 the presence of an antheridium. 



Rickia Discopomae nov. sp. 



Hyaline, becoming slightly soiled with dirty brownish throughout. 

 Basal cell large, twice as long as broad. Main body of the receptacle 

 of about the same diameter throughout, broadening slightly below 

 the perithecium, usually rather strongly curved. Cells of the three 

 cell-series small, subec[ual, squarish or subisodiametric, arranged in 

 tiers of three cells each with some regularity; the middle series extend- 

 ing half way along the tip of the perithecium, its two or three terminal 

 cells free beyond the base of the primary appendage, which terminates 

 the posterior marginal row. Cells of the median row fifty to sixty 

 in number, sometimes less; those of the anterior marginal row thirty 

 to fifty; of the posterior marginal row fifty to sixty, the cells of both 

 marginal rows cutting off appendiculate cells irregularly, except 

 those of the posterior row opposite the perithecium which produce 

 them uninterruptedly ; the appendages and antheridia thus irregularly 

 and rather sparingly distributed along the margins. Appendages 

 short and usually inflated. Perithecium rather short and stout, 

 the tip often somewhat bent outward, the apex blunt. Spores 30 X 

 5 fx. Perithecium 48-52 X 18-25 m- Total length 250-350 X 18- 

 32 fi, measured below the perithecium. Appendages 7-10 X 3-4 fx. 



On superior surface of Discopoma sp. Peradenyia, Ceylon, No. 2111. 



The antheridia of this species are not certainly recognized, but 

 appear to be of the type seen in " Distichomyces." The appendages 

 appear to branch occasionally, becoming furcate, a condition possibly 

 resulting from the proliferation of old antheridia. 



