| Fig. | | Page | | PLEUROSIGMA | | 1 | Pleurosigma strigosum Wm. Sm. | 74 | | 2 | Pleurosigma rigidum Wm. Sm. | 75 | | 3 | Pleurosigma angulatum (Quekett) Cl. | 74 | | 4 | Pleurosigma obscurum Wm. Sm. | 74 | | 5 | Pleurosigma formosum Wm. Sm. | 73 | | 6 | Pleurosigma naviculaceum BrÉb. | 74 | | 7 | Pleurosigma Æstuarii BrÉb. | 74 | | 8 | Pleurosigma virginiacum H. L. Smith | 74 | | | | Fig. | | Page | | PLEUROSIGMA | | 1 | Pleurosigma strigosum Wm. Sm. | 74 | | 2 | Pleurosigma rigidum Wm. Sm. | 75 | | 3 | Pleurosigma angulatum (Quekett) Cl. | 74 | | 4 | Pleurosigma obscurum Wm. Sm. | 74 | | 5 | Pleurosigma formosum Wm. Sm. | 73 | | 6 | Pleurosigma naviculaceum BrÉb. | 74 | | 7 | Pleurosigma Æstuarii BrÉb. | 74 | | 8 | Pleurosigma virginiacum H. L. Smith | 74 | |
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