. Annual report . 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 64
. Annual report . 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 of the Deep kill section OR APTOLITES Memoir YState Museum Plate 11. G-SB. del. W. S. GRAPTOLITES OF NEW YORK, PART 1 769 Tetragraptus clarkei sp. nov. Page 65« 11-13 Different aspects of young rhabdosomes. x2 14. 16 A mature rhabdosome, enlarged (x2) to show more distinctty the character of the thecae ; and the same in natural size15 Young rhabdosome, showing a rapid widening of the branchesGraptolite bed 3 of the Deep kill section Tetragraptus pendens Elles Page 653 17-19 Three different aspects of mature rhabdosomes; figure 18. xlh20 Enlargement of fragment of branch. x6£Graptolite bed 3 of the Deep kill section 770 NEW YORK STATE MUSEUM PLATE 12 Genus tetragraptus Salter See pi. 9,10, 11 Tetragraptus woodi sp. nov. Page 662 1 Young rhabdosome, which is so compressed that the angle of divergence oftbe branches of the second order is shown15, 16 Two mature specimens Graptolite bed 2 of the Deep kill section Tetragraptus similis Hall (sp.) Page 658 2, 3 Two mature rhabdosomes laterally compressed and showing
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