14 PROCEEDINGS OP THE AMERICAN ACADEMY. 



protected by a shield or shell-like, usually very unequally bilobed cellular 

 upgrowth, rounded or bluntly pointed above, the symmetrically curved 

 successive cells which compose it enormously elongated transversely, 

 their lumen scarcely wider than the intervening walls and forming a 

 series of concentrically arranged arcs, the concavities directed downward. 

 Perithecia one to six, commonly five in well-developed specimens, slightly 

 divergent from the median line, long, pointed, tapering from the slightly, 

 more or less asymmetrically inflated base ; the distal portion not clearly 

 differentiated, tapering more or less, curved, the slender upper portion 

 bent abruptly inward toward the tip ; the pointed apex bent inward, 

 subtended externally by a terminal, slightly incurved, rather slender, 

 bluntly pointed unicellular process, the cells of the cell row which it 

 terminates distinctly larger than the other wall-cells ; basal cells some- 

 what prominent. Spores 16xl.5/x. Perithecia 145-220 X 30-36 ti, 

 the process 14 fi. Secondary receptacle, including protective shield, in 

 well-developed individuals 125 X 75 it; in small specimens 35 X 50 it ; 

 when vertically developed without shield 35-110 X 18 it. 



On Periplaneta Americana Sauss. (type form), Cambridge (Mr. Bul- 

 lard) : Bermuda ; Mus. Conip. Zool. On Periplaneta Australasiae 

 Sauss.,. Bermuda. On Periplaneta spp., Mexico, West Indies, Panama, 

 Brazil, Africa, South Seas, China. All Mus. Comp. Zool. On Stylopycja 

 orientalis Scudd., Boston, Mus. Comp. Zool. 



Herpomyces arietinus nov. sp. 



Male individual consisting of four superposed ceWs, the basal one 

 relatively long, the distal ones bearing two to three antheridia. Length 

 about 29 it. Antheridia about 20 it. 



Female individual hyaline. Primary receptacle surmounted by two 

 sterile cells, the upper terminated by an erect distally mucronate append- 

 age ; the subbasal cell giving rise to two branches (or to a branch which 

 becomes immediately furcate ?) each branchlet producing a secondary 

 receptacle. Secondary receptacles two, symmetrically paired, each con- 

 sisting of a horizontal series of about twelve or more vertically elongated, 

 subfusiform, more or less curved cells, corresponding to and external to 

 the fertile cell which bears the primary perithecium, the external margin 

 free, other fertile cells (of which there appears to be but one in the type) 

 completely hidden behind it. Ascigerous portion of the perithecium 

 relatively long, hardly inflated, tapering slightly above, where it passes 

 into the distal portion ; which is about half as long, tapers very slightly, 

 and is terminated by an incurved, tongue-like, slender, subcylindrica] 



