376 PROCEEDINGS OF THE AMERICAN ACADEMY. 



to four subequal obliquely separated cells, the lowest cutting off an 

 appendiculate cell distally and externally, the upper an antheridium 

 of the Peyritschiella-type, which subtends the base of the perithecium 

 from which its hyaline sharply pointed stout extremity projects 

 obliquely upward: posterior marginal series consisting of usually 

 seven obliquely separated cells, usually the first, third and fifth, only, 

 separating a rather large appendiculate cell; the uppermost cell 

 triangular, its upper margin continuous with that of the distal cell of 

 the median series, subtending the basal and large subtending cell of 

 the primary appendage, the two latter subequal, the basal somewhat 

 broader : median series consisting of normally six successively smaller, 

 vertically slightly elongated cells. Perithecium erect, slightly curved 

 outward distally, ihe tip free, the apex symmetrical, truncate, slightly 

 papillate. Appendages relatively long and stout, yellowish, sub- 

 cylindrical, the basal ring black and conspicuous; 15-25 X 3.5 fx, the 

 primary one 30^5 ijl, its basal and subtending cells 10 X 4 ju. Peri- 

 thecium 25 X 9 /x. Basal cell including foot 20 X 7 /jl. Total length 

 to tip of perithecium 55-65 X 18-22 ju. 



On an undetermined gamasid mite. Trinidad, No. 2308. 



This species is well distinguished by its large discrete yellowish 

 appendages, somewhat elongate form, and large single antheridium. 

 In one of the nine specimens examined a second antheridium is devel- 

 oped just below the first. 



Rickia spathulata nov. sp. 



General form spathulate except for the projecting tip of the peri- 

 thecium. Basal cell rather stout, its upper half or less inserted in 

 the sharp angle between the lower cells of the marginal series. An- 

 terior series consisting of six to eight cells, the lowest irregularly 

 triangular, externally slightly concave, and without appendage, the 

 rest usually but not always appendiculate, radially elongated, and 

 slightly oblique upward; the subterminal cell bearing also an an- 

 theridium, the basal cell of which penetrates three fourths of its length; 

 the terminal cell sometimes separating a second antheridium, its 

 inner margin in contact with the lower two thirds of the perithecium, 

 narrow, its extremity broader and convex: posterior series consisting 

 of ten to thirteen cells, usually eleven, the lowest externally convex 

 like the rest, the other members of the series each usually cutting off 

 an appendiculate cell about half their length and lying between them ; 

 the upper ones successively narrower and more elongated radially; 



