MONOGRAni OP THE T. \ROUI.r>ENlACE.i:. 375 
superposed cells. Tlic postci-ior row U-rniinatos opj)osltc the base of this appoTidngo in n MIoIm J 
prominence beyond uhicli the short more or less pointed apex i? often strongly bcnrto or towards 
the base of the pcritho-ial appendage. Antheridial appendage short and 8<o.d, nsually I.-^ than 
one third as long as the perithon-um, snb-conical, with numerous bianclus prrfdneed from it« 
inner side, slender, raiher rigid, witli more or less divergent hrandilcls. "Reepj)taclc consisting 
of three superposed cells, followed by two cells; the i>nstcrIor larger and Adlowed by the basal 
cells of the appendage ; the anterior much smaller, followed by a poeond roll about equalling it 
in size, beyond whieh follows the base of the peritheelnuj : the b;i^al roll wholly or partly h\a- 
linc or translucent above the large jet black foot ; (he remaining cells deeply blackened oxce'].t 
along their anterior edges, the blackening involving tbr ba- of the antheridial aj,pendagc. 
Spores, 110-120 x 4/i. Pcrithccia, 280-300 x C5-70 /., longest, n?>0 ^, its appenda^o 180-200/.. 
Total length to tip of pcrithcclnm, 400-.v2:.;i. Antheridial appendage (exclusive of lis 
branches) about one tliin 
On Tropisierniis ylah 
Kittcry Point, Maine. 
This speeies, though ].erhaps the commonest member of the genus, seems never vcrv abun- 
dant. It is subject to a good deal of variation in size, but is otherwise very constant in its 
characters and easily distinguished from the rarer C. confa^ius. It ts found on the lower surface 
of the abdomen and thorax of its host, especially along the margin of the former on the left side, 
and is conspicuous from its large size. 
It may be mentioned that this species, and probably the succeeding, is subject to the external 
parisitism of a Chytridiaceous parasite of singular structure resembling the Obeljdium oi Xowa- 
kowski in some respects, but apparently belonging to an undescribed genus. The development 
of this plant has not, however, been as yet fully made out. 
leeium. 
t'j 
Mns« 
Cekatomyces C0NFrsu3 Thaxtcr. Plate XXIV, figs. 11, 12. 
Proc. Am. Arn<!. Arts and Sci. Vol. XX \', p. 480. 
General habit and color as in 0. mlralilk. Perithecium hardly inflated, its inner margin 
curving evenly to the prominent blunt aj.ex which stands out free from the base of the pcritheejal 
appendage. The pcrithccial appendage shorter and usually stouter than in C. mirahilis, without 
the bulbous inflation at its base. Axis of antheridial appendage long and slender, distally 
attenuated, with comparatively few short branches. Receptacle as in C. mirahilis. Spores, 
75-90 X 3.7 /i. Perithecia, 285-335x65;*. Axis of antheridial ap].endagc 235 /* (longest;. 
Receptacle, 165 x 75 /i. 
On Tropisternm glaler lib. and T. nimbatus Say, Milford, Connecticut, and Kitt<;ry Point, 
Maine. 
an 
any posterior prominences below the apex of the perithecium, as well as by the differences 
presented by its peritheeial and antheridial appendages. Its spores also seem constantly smaller, 
and although the two species arc so strikingly similar, it is unlikely that they are mere varirties 
of a single form. It occurs, like the preceding species, along the inferior margin of its host's 
body, but almost always on the opposite (right) side. 
