Geology and paleontology / by B.K. Emerson [and others].

Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Geology and paleontology / by B.K. Emerson [and others]. Source: Wellcome Collection.

    243/318 (page 145)
    YAKUTAT FOSSILS H5 voluted cylindrical stem originally hollow. H. labyrinthica, on the contrary, was almost certainly solid. What to do with the latter we are not prepared to say, although we have provisionally referred what we believe is a congeneric species to Helminthoida under the name of H. vaga. So far as we can see the latter is distinguished from H. labyrinthica only by its much longer loops and generally looser habit of growth. Locality. — Pogibshi Island, opposite the village of Kadiak, Alaska. Collectors. — G. K. Gilbert, B. K. Emerson, Charles Palaclie. Genus Myelophycus gen. nov. (Miinsteria, part, Fischer-Ooster.) As interpreted these supposed marine plants were simple, curved, subcylindrical or claviform masses, consisting of an outer laminated and superficially granulose integument and an inner pith-like portion made up of a succession of conical cups set one into the other. Besides the type species next described we know of only one other form that we would refer to this genus. This was figured in 1S5S by Fischer-Ooster in his paper entitled Die fossilen Fucoiden der Schweizer-Alpen (pi. xvi, fig. 5), and referred by him to A'liinsteria hcessii Sternberg. Comparing this figure with all others at hand of Sternberg’s species, we find that it is clearly distinct, the M. hcessii of other authors being without the granulose external integument. This outer integument and the invaginated cones of the inner portion distinguish the proposed genus from Miinsteria, Keckia, Ceratophy- cus, Caulinites and other genera having a transversely wrinkled surface. Myelophycus curvatum sp. nov. pi. xiii, fig. 2. The originally cylindrical or club-shaped masses upon which this species is founded are now greatly compressed and cover most of one surface of a slightly arenaceous slab of slate about 8 inches wide and between 12 and 13 inches long. They are from 10 cm. to 15 cm. long, strongly curved, and from 2 cm. to 4 cm. wide, the latter di- mension being at one of the extremities, which as a rule is more or less expanded. The average width may be set down at about 3 cm. When the outer integument, which is thick, laminated and superfici- ally rather coarsely granulose, is worn away, the invaginated cones of the inner structure, which takes up about half the width of the entire fossil, are exposed. When the wearing has not materially affected these, then only their straight or accidentally curved edges are seen,