Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 589
rojections at the angleswhich are shown in that species are prolonged in some other speciesinto horns ; whilst in others, again, they are mere tubercular eleva-tions. Although the triangular form of the frustule, when looked atsideways, is that which is characteristic of the genus, yet in some… … DlATOMACEJE : AXGULIFEEAZ, CILETOCEEEM 543 forms.1 This departure is extremely remarkable, since it breaksdown what seems at first to be the most distinctive character of thegenus ; and its occurrence is an indication of the degree of latitudewhich we ought to allow in other cases. It is difficult,…
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