. Maryland geological survey. es. X 67. 2. Tangential section, a, resin-duct; 6, bordered pits on tangential walls; c, sections of pits of radial walls. X 67. 3. Radial section, a, point at which the structure has disappeared; 6, medullary rays, mostly showing oblong pores. X 67. 4. Radial section. Same section as Fig. 3. X 242. o, pits on walls of medullary rays; &, pits on walls of tracheids. 5. Transverse section further enlarged, a, medullary ray; 6, cells of spring wood; c, section of pits on radial walls; d, section ofpits on tangential wall. X 242. 6. Tangential section, a, resin-duct;

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. Maryland geological survey. es. X 67. 2. Tangential section, a, resin-duct; 6, bordered pits on tangential walls; c, sections of pits of radial walls. X 67. 3. Radial section, a, point at which the structure has disappeared; 6, medullary rays, mostly showing oblong pores. X 67. 4. Radial section. Same section as Fig. 3. X 242. o, pits on walls of medullary rays; &, pits on walls of tracheids. 5. Transverse section further enlarged, a, medullary ray; 6, cells of spring wood; c, section of pits on radial walls; d, section ofpits on tangential wall. X 242. 6. Tangential section, a, resin-duct; &, bordered pits on tracheids; c, bordered pits on resin-duct connected by spiral lines. Figs. 7, 8. CuPEESsiNOXYLON Wardi Knowlton. B. & O. R. R. Cut, D. C. (after Knowlton) 415 7. Radial section, a, medullary rays; &, single row of pits on tra- cheids. X 67. 8. Tangential section, a, resin-duct; 6, medullary two cells broad. X67. 563 MARYLAND GEOLOGICAL SURVEY. LOWER CRETACEOUS, PLATE LXIX. yOf=cs! Qwm B^i||.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1901