. Annual report . nema and primary disk. x8All the originals are from graptolite bed 2 of the Deep kill sectionwith the exception of that of figure 11 which is from bed 3 and is doubt-fully referred to this species. 766 NEW YORK STATE MUSEUM PLATE 10 Genus tetragraptus Salter See pi. 9, 11, 12 Tetragraptus fruticosus Hall (sp.) Page 649See pi. 9 1 Young rhabdosonie in which the branches have not yet commenced torecurve2, 3 Specimens with narrow, early recurving branches (var. tubiformis) 4 A well developed specimen with somewhat later beginning geniculation of the branches. Shows broad nema (n
. Annual report . nema and primary disk. x8All the originals are from graptolite bed 2 of the Deep kill sectionwith the exception of that of figure 11 which is from bed 3 and is doubt-fully referred to this species. 766 NEW YORK STATE MUSEUM PLATE 10 Genus tetragraptus Salter See pi. 9, 11, 12 Tetragraptus fruticosus Hall (sp.) Page 649See pi. 9 1 Young rhabdosonie in which the branches have not yet commenced torecurve2, 3 Specimens with narrow, early recurving branches (var. tubiformis) 4 A well developed specimen with somewhat later beginning geniculation of the branches. Shows broad nema (nemacaulus) 5 Younger rhabdosome with the characters of var. tubiformis 6 A rhabdosome intermediate between the preceding and following forms. x2 7 Form with very late geniculation of the branches (var. campanulatus) and broad nema8-10 Specimens with extremely late or imperfect recurving of thebranchesOriginals are all from graptolite bed 2 of the Deep kill section. OJtAPTOLITKS Memoir 7. Museum. Plate 10. del. W. S. 70S NEW YORK STATE MUSEUM PLATE 11Genus tetragraptus Salter See pi. 9, 10, 12 Tetragraptus quadribrachiatus Hall (sp.) Page 6« 1 Young rhabdosome Graptolite bed 2 of the Deep kill section 2 A young rhabdosome referred to this species Graptolite bed 7 of the Deep kill section 3 Mature rhabdosome in which one of the branches has become laterally compressed, thus giving a lateral view of the thecaeGraptolite bed 2 of the Deep kill section 4 Common appearance and mode of preservation of the rhabdosomes in the shaleGraptolite bed 2 of the Deep kill section Tetragraptus amii Elles <fc Wood Page 647 5 Typical mature rhabdosome 6 A younger rhabdosome showing the angle of divergence between the two pairs of branches 7 Young rhabdosome compressed laterally Graptolite bed 2 of the Deep kill section Tetragraptus serra Brongniart (sp.) Page 655 8 Young rhabdosome. x2 9 Average specimen 10 Enlargement of fragment of branch. x2Graptolite bed 2
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