. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . atest development in Peridinium 63 •umltistriatum Kofoid (07 B), in which species they occupy a bigger areaof the cell-wall than the plates themselves (consult fig. 45). It has beennoticed in many species of Peridinium that the intercalary bands are widerand the striations stronger in old than in young cells, and it is probable thatthis increase in width of the intercalary bands is a means whereby thearmour-plated cell may grow in size. Adjac
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . atest development in Peridinium 63 •umltistriatum Kofoid (07 B), in which species they occupy a bigger areaof the cell-wall than the plates themselves (consult fig. 45). It has beennoticed in many species of Peridinium that the intercalary bands are widerand the striations stronger in old than in young cells, and it is probable thatthis increase in width of the intercalary bands is a means whereby thearmour-plated cell may grow in size. Adjacent plates are joined by over-lapping margins, which are often grooved and firmly cemented. It is by anextension of the surface of these thin outer flanges of the plates that theincrease in width of the intercalary bands is accomplished. Kofoid (09 A)states that the increased width of the intercalary bands is associated withthe thickening of the cell-wall and the reduction in the porulate areas of theplates, and he suggests that these bands may be structural adaptationsfacilitating communication between the exterior and the interior of the cell,.
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