PLATE LXIV. 
LlClIENAL1A CULTELLATA. 
Pag! 202. 
Fig. 1. An enlargement of one of the monticules, showing the form and disposition of the cell apertures; 
usually the cell apertures are trilobate. (X 6.) 
Fig. 2. A still farther enlargement of the center of the monticule, showing the ridges extending from the 
center to the adjacent cell apertures. (X 18.) 
Hamilton group. Fall-brook, four miles east of Canandaigua lake, on the old Geneva 
road, Ontario county, N. Y. 
BOTRYLLOrORA SOCIALIS. 
Page 2S2. 
Fig. 3. An enlargement, showing the general appearance of a specimen, the arrangement of the cell 
apertures, and the bullae of the surface. (X 6.) 
Fig. 4. An enlargement of a vertical section,‘showing the form and mode of growth of the cell tubes, 
■and Ihe intercellular vesicles. (X 6.) 
Hamilton group. York, Livingston county, N. Y. 
O'RAMELLA SCIDACEA. 
Page 240. 
Fig. 5. A fragment of a frond, natural size, showing the form and arrangement of the maculae. 
Fig. (j. An enlargement, showing one of the maculae, and the form and disposition of the cell apertures. 
(X 6.) 
Hamilton group. Shurger's Glen, Norton's Landing, Cayuga lake, N. Y. 
Fig. 7. A fragment of a frond, natural size, showing narrow, elongate maculae ; the surface is macerated. 
Fig. 8. An enlargement from the preceding, showing one of the maculae, and the appearance of the 
macerated surface. 
Hamilton group. Near Alexander, Genesee county, N. Y. 
COSCIINELLA ELEGANTULA. 
Page 239. 
Fig. 9. A part of a frond, natural size, showing the general appearance, the radiation, and the form and 
disposition of the fenestrules ox 1 perorations. 
Fig. 10. An enlargement from the preceding, showing the fonn and disposition of the cell apertures, the 
intermediate pits, and the pits suiTounding the fenestrules. (X 6.) 
Fig. 11. An enlargement of a vertical section, showing the form and manner of growth of the cell tubes, 
and the intercellular vesicles. (X 6.) 
Fig. 12. An enlai'gement of a transverse section,showing the fonn of the frond between the fenestrules. 
(X 6.) 
Hamilton group. Widder, Ontario, Canada. 
COSCINIUM STRIATUM. 
Page 23S. 
A part of a frond, natural size, showing the general appearance, and the fonn and disposition 
of the fenestrules. 
An enlargement from the preceding, showing the disposition of the cell apertures, the inter¬ 
mediate striations, and the non-celluliferous space bordering the fenestrules. (X 6.) 
A still further enlargement, showing circular cell apertures, slight, denticulated peristomes, 
and the intermediate nodes and stx-iae. (X 18.) 
An enlargement from another portion of the same frond, showing oval cell apertures; the other 
characters being similar to those of the px-eceding figxxi-e. (X 18.) 
Hamilton group. 1 Vest Williams, Ontario, Canada. 
Fig. 13. 
Fig. 14. 
Fig. If). 
Fig. 16. 
