CHITONOMYCES AND RICKIA. 27 



of three, very rarely of four, usually subequal flattened cells, all of 

 which are in contact with the inner margin of the peritheciuni to its 

 tip; the uppermost extending above the corresponding cell of the 

 posterior series. Perithecium rather short and stout, its anterior 

 margin almost wholly free, the tip not distinguished, its apex bluntly 

 rounded. Spores about 18 X 2.5 /jl. Perithecia 35 X 12 /x the mar- 

 ginal cells X 3 fjL. Appendages 10-12 X 3.4 ^l. Basal cell 10-12 X 

 4.5-5 M- Total length to tip of perithecium 55-65 X 16-25 /x- 



On Hypoaspis sp., No. 2797, Grand Etang, Grenada, B. W. I. 



This very minute species is perhaps most nearly related to R. 

 Celaenopsis. As in this species, its sessile antheridium arises at the 

 base of the perithecium and is not distinguished by any blackened base, 

 a characteristic also found in R. minuta. The host is a very minute 

 mite which was found parasitic on a termite, and which ]\Ir. Banks, 

 who has kindly examined it for me, regards as a new species. 



Rickia Euxesti nov. sp. 



Hyaline, short and usually stout. Receptacle triseriate, the basal 

 cell forming a short stalk, usually bent slightly, and distally intruded 

 between the subsimilar basal cells of the two marginal series: the 

 anterior series consisting of five, rarely six or four, superposed cells, 

 broader than long, their transverse axes often subradiately arranged, 

 the upper slightly larger, the uppermost lying below the base of the 

 perithecium which is slightly tipped to one side; all the cells, except the 

 one or two lowest, cutting off one, often two relatively large cells distally 

 and externally, a majority of wliich usually bear typical antheridia, 

 while a few may be appendiculate: median series consisting of four, 

 rarely five or three cells, the two, rarely three, lower usually larger, 

 subequal, lying below the base of the perithecium; the two, rarely 

 three, upper successively smaller and flatter, hdng in contact with its 

 inner margin: posterior series consisting of seven to rarely nine or five 

 cells, the upper thi-ee or four successively much smaller, the rest 

 subequal, the uppermost bearing the basal cell of the primary append- 

 ages, the rest, except the lowest, cutting off one, or less often two, 

 relatively large superposed cells which bear either appendages or an- 

 theridia: all the cells of the receptacle proper lying below the peri- 

 thecium of about the same size, the latter subtended by a distinct 

 stalk-cell. Antheridia relatively large and numerous, the basal ring 

 broad, the neck strongly curved outward. Appendages scanty. 



