24 THAXTER, 



the tip of the perithecium; the second united wholly, the third for 

 half its length to the posterior margin of the perithecium ; the lowest, 

 which is broader below, separating by its whole width the lower cell 

 of the anterior series from the basal cell of the receptacle: the posterior 

 series, a majority of the cells of which cut off single appendiculate cells 

 distally and externally, becomes imited above the middle of its third 

 cell to the cells of the median series; which are long and flattened, 

 without appendages, the two lower united to the upper half of the 

 inner margin of the perithecium nearly to its apex; the posterior and 

 median series together forming a long, slender, tapering, free, flagel- 

 lum-like prolongation; which is determinate, owing to intercalary 

 division below the two-celled base of the primary appendage, by which 

 it is terminated; the cells of the two series irregularly paired. Peri- 

 thecia erect, long and narrow, the tip somewhat distinguished, slightly 

 bent distally, the apex terminating in a slightly curved projection. 

 Spores about 20 X 2 fx. Perithecia about 36 X 6 /^. Opaque portion 

 of basal cell 26 X 3.5 m- Total length to tip of perithecium about 

 50 n; to tip of flagellum (variable) 160-190 fx. Greatest width 15 /x. 

 Appendages 15-25 X S jj,. 



On antennae of a large species of Passalusf; Dominica, B. W. I., 

 No. 2170, M. C. Z. 



This peculiar and aberrant species is at once distinguished by the 

 blackened extension of the basal cell which closely resembles in general 

 appearance the similar modifications of the basal cells which occur in 

 many of the stilicolous species of Corethromyces. It is most nearly 

 related to the African R. filifera, in which the median series of cells, 

 which in the present species form the inner half of the flagellum, is 

 replaced by two cells lying opposite the apex of the perithecium; the 

 free portion of the flagellum being therefore uniseriate. A reexamina- 

 tion of abundant material of the African form shows, also, that the 

 flagellum, as in the present species, is terminated by the primary 

 appendage and its two basal cells. 



Rickia parvula nov. sp. 



Hyaline. Basal cell short, irregularly triangular; its base, only, 

 free; obliquely and asymmetrically adjusted to the two cells above it. 

 Receptacle triseriate, the anterior series consisting of four superposed 

 cells, the two lower greatly flattened and obliquely associated, the 

 lower cutting oft' a relatively large appendiculate cell distally and 



