CHITONOMYCES AND RICKIA. 53 



yellowish, usually elongate, straight or sometimes variously bent. 

 Basal cell very small, sometimes almost obliterated by the intrusion 

 of the basal cell of the anterior series: anterior series consisting of two 

 elongate cells; the upper shorter and separated below by a septum 

 running obliquely inward and downward, cutting oft" distally a marginal 

 series of four to six closely associated appendiculate cells; the lower 

 slightly prominent distally, just below the septum, and sometimes 

 cutting oft" one or two appendiculate cells at this point: posterior 

 series similar, the upper cell shorter than that of the anterior, its 

 margin often entirely occupied by a marginal row of small closely 

 associated appendiculate cells, the uppermost usually lying between 

 the perithecium and the base of the primary appendage, which is small 

 and short, its basal cell slightly intruded and much smaller than the 

 somewhat rounded distal cell : median series consisting of a very small 

 cell lying beside the base of the perithecium and a greatly elongated 

 cell which extends to within a short distance of the base of the margi- 

 nal cells which are in contact below it and are of about the same uni- 

 form diameter throughout. Appendages of the usual type, cylindrical 

 or slightly tapering. Antheridia rarely developed, the antheridial 

 cells apparently becoming free in small groups. Perithecia almost 

 wholly free, long, narrower toward the base, the margins slightly 

 convex and nearly symmetrical, nearly erect or slightly divergent 

 outward, the base oblique, the tip more or less distinguished, taper- 

 ing considerably, and usually s\TnmetricalIy, to the rather narrow 

 bluntly rounded apex. Spores about 35 X 3.5 /x. Perithecia 116- 

 136 X 27 ju. Appendages 40 X 4 m- Total length to tip of peri- 

 thecium 300-400 X 34^0 m- 



On the legs and inferior surface of Zirophorus sp., No. 2802, vicinity 

 of Port of Spain, and at Arima, Trinidad, B. W. I. 



This species is a third well marked representative of the section to 

 which R. marginata and R. Lispini belong, and is very nearly allied to 

 the latter, from which it differs in its much greater size and elongate 

 habit, and differently shaped practically free perithecium. In a few 

 individuals, in which the perithecium has aborted, the appendages 

 appear to be in some instances replaced by groups of three or four short 

 free antheridia, as in R. Leptochiri and some others. Although the host 

 is not uncommon in Trinidad, the parasite appears to be decidedly 

 rare. 



