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 II* vaga. So far as we can see the latter is distinguished 
from II. 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 Palache. 
Genus Myelophycus gen. nov. 
(.Munsteria , 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 1858 by 
Fischer-Ooster in his paper entitled Die fossilen Fucoiden der 
Schweizer-Alpen (pi. xvi, fig. 5), and referred by him to Munsteria 
hoessii 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 Munsteria , Keckia , Ceratofhy- 
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, 
