MONOGRAPII OF THE LABOULBENIACE^E. 
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the " trichogyne " nearly to the base of the inner cell, rcrilhccia, 80-90 X 21 ft. Receptacle, 
total length, 75-80 jx; length to tip of pcrithccium, llU-l^'O/i. 
On Desmopacliria convexa Aube, Kittery Point, :\laine, and Xc«r ITaven, Connecticut. 
This species differs from those previously described by the apparent absence of the fourth 
cell in the distal portion of the receptacle. It is related to the preceding species in its cell 
arrangement, but is easily separated by its greater size, i\\Q relative position and shape of the 
perithecia, etc. The ascogenic cell faces outward, a position which seems exceptional. It is 
apparently rare, and occurs in small numbers on the anterior legs of its host. 
Chitonomyces aurantiacus Thaxter. Plate XX^'1, figs. G-7. 
HEiJiATOMiCKS AUKAXTiACca: Proc Am. Acad. Arts and 8d. Vol. XXIX, j). 103. 
Pale straw-colored, the cell contents including numerous rather bright orango granules or oil 
globules. Perithecium exceeding the tip of the receptacle by from ono-fifdi to one-quarter of its 
length, small, slender, the tip usually curved outward, the lips rather prominent, its external 
basal cell marked by more or less distinct and very fine transverse ridges. Receptacle slender, 
the basal cell suffused with brown below, the sub-basal cell small and Hat, the two succeeding 
d continued 
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lower very long and narrow, sub-triangular, obliquely superposed, their lower extremities nearly 
touching the sub-basal cell. Perithecium, 50 X 14-15^. Total length to ti]) of receptacle, 8: 
90 /t ; to tip of perithecium, 100-110 ^. Greatest breadth, 22 /*. 
On Desmopachria convexa Aube, Kittery Point, Maine. 
A rare species occurring on the right elytron near the middle of its distal half. Dis- 
tinguished from C. horealls, which occurs also very rarely on the same host, and 0. Bldessarim, 
by its slender form and orange color as well as the details of its structure. It is a very delicate 
species, seldom found in good condition. The striation of the outer basal cell of the perithecium 
is very characteristic, but not always distinct. 
HYDR.T:0MYCES nov. gen. Plates XXYI and YIII. 
Receptacle consisting of a basal and terminal portion, the latter united to the perithecium 
along its inner margin and terminating in a sub-conical, terminally appendiculate free cell, the 
cell below the sub-terminal cell producing from its left face three outgrowths, which extend 
upward, and are separated as cells, ending liice the terminal cell in a sub-conical body bearing a 
single terminal appendage and almost completely concealing the face of the sub-terminal cell : 
the basal portion consisting of three superposed cells, above which three or perhaps four cells 
form the base of the perithecium. The wall-cells of the latter arranged in four longitudinal 
(eight) 
Spores fusiform, once-septate. 
In view of the invariable character of the fundamental cell structure and arrangement in 
the sixteen species composing the genus Chitonomyces, to which the single form included by the 
present genus was first referred, and the very distinct variations from this type presented by 
