DESMIÜS FLORA OF MÏCHIGAN 
257 
C. excavatum var. duplo-major Lund. Calhoun County. 
C. galeritum Nordst. Presque Isle County. 
C. gaijanum var. eboracense G. S. West. Chippewa and Roscominon 
Counties. 
C. geometricum var. suedciim Borge. Calhoun County. 
C. laeve var. octangularis (Willie) West and West. Calhoun Coun¬ 
ty. 
C. margaritaium var. minor (Boldt) West and West. Barry, 
Calhoun, Delta, Enimet, Marquette. Menominee, Oakland and 
WashtenaAv Counties. 
C. margaritaium var. ridibundum Taylor. Eniniet County. 
C. mediogemmutum West and West. A single specimen froin 
Oakland County resembles Ihis species but has only a single 
transverse row of Ihree granules on each semicell. This speci- 
inen may repre,scnt a reduced form of the typical which has 
three transverse rows of granules (Iwo in upper, three in middie, 
two in lower) in addition to a single granule in each basal angle. 
C. minimum West and West. Calhoun County. 
C. moerlianum var. brasiliense Borge fa. A single specimen froin 
Calhoun County resembled this variety although the subapical 
ornamentation was not clearly granular, but merely slight 
protubérances from the wall. 
C. moniliforme fa. punctata Lagerh. Einmet County. 
C. moniliforme fa. panduriformis Heimerl. Barry County. 
C. moniliforme fa. elongata West and West. Barry, Eminet and 
Schoolcraft Counties. 
C. moniliforme var. subpyriforme West and West. Delta County. 
C. monomazum var. polymazum Nordst. Barry, Cheboygan and 
Schoolcraft Counties. 
C. netzerianiim Schmidle fa. A single specimen from Oakland 
County is assigned here questionably because the semicell is 
distinctly more rectangular renifonn than the typical and be¬ 
cause the semicell is ornamented with deep subcircular-elliptic 
dépréssions so that the semicell margin appears to be granulate 
although it is the cell wall projections between the adjacent 
dépréssions which appear to be granules. The typical is orna- 
mented with several transversely oblique sériés of granules. 
C. norvegicum Strôm. Barry and Calhoun Counties. 
C. ocellaium Eichl. and Gutw. fa. Specimens from Barry County 
appear to be intermediate between the typical and several varie- 
ties. The semicell shape and the sinus are close to the var. 
rotundatum Fritsch and Rich but the central scrobiculation is 
irregularly surrounded by two or three smaller scrobiculations 
as in the variety incrassatum West and West. 
