son 
PALAEONTOLOGY OP NEW-YORK. 
Fig. 4 a, 6. A germ or young graptolite, showing the rootlets below and a short axial fibre 
extending above. This is a broad form, apparently of the doubly serrated kind, 
or diplograpsus , and appears to be developed to the first serratures. The figures 
are respectively of the natural size and enlarged. 
Fig. 5. A minute specimen of a less symmetrical and apparently less fully developed form. 
Fig. 6. Another individual which is farther developed than either of the preceding : the line 
marks the natural size. 
There are several other varieties of form, which, inferring from the central 
midrib, are of those serrated on the two sides of the stipe, as are all those yet 
discovered with the vesicles attached. 
Fig. 7 is apparently the young of one of the singly serrated forms, from the radical fibre 
extending along one side and beyond the body, while minute fibres (or rootlets?) 
extend downwards. 
All these young forms preserve the axial fibre extended beyond the substance 
of the stipe, and there are usually two or three slender fibres extended below in 
the direction of the radix. 
The condition of these bodies, and their association with those bearing the sacs, 
are so constant, that I have inferred their connection, and that these are in fact 
the embryonic sacs. 
The collection of specimens is quite numerous; but I am still making additions, 
with the hope that, at no distant period, we may know something satisfactory rela¬ 
tive to this newly observed and peculiar development. 
The following new species of Graptolites appear to be worthy of notice 
in this place. 
Graptolitlius multifasciatus. 
Body consisting of numerous bifurcating branches, which are arranged 
bilaterally on either side of a short strong central bar. The branches 
bifurcate irregularly, and the subdivisions on one side amount to 
twenty-one, and on the other to twenty-two, while the specimen is far 
