Lesquereux. } 166 [Oct. 19, 
Habitat. Lower Heldeberg Sandstone, Michigan. Discovered and com- 
municated by Dr. Carl Rominger, State Geologist. 
CALAMARI A. 
ANNULARIA? Brei. 
Stem articulate ; leaves virticillate, lingulate, gradually narrowing to the 
base, either pointed or rounded at the top ; midrib thick. 
Our species differs from the generic characters by the absence of a mid- 
rib. The leaves, however, are very small, indistinct, their substance being 
amalgamated into that of the stone, and the nervation is nearly obsolete. 
This vegetable form might be referable to Sphenophyllum, or even to 
some peculiar generic division. Its characters relate it positively to the 
sections of the Calamari, as far as it is fixed until now. 
ANNULARIA ROMINGERI, sp. nov. 
Pl. I, fig. 6. 
Stems long and slender, articulate, smooth ; articulations at regular short 
distances, inflated, bearing oblique branches and leaves; leaves small, 
lingulate, apparently flat, either truncate or rounded at the top; nervation 
obsolete. 
The inflated nodi and the flattened leaves, refer the plants to Spheno- 
phyllum, while the obtuse, entire, numerous leaflets, disjointed to the base, 
relate it to Annularia. From both these genera it is removed by the 
smooth, not ribbed, nor striate stem, and by the oblique direction of the 
branches. By this last character it is allied to Asterophyllites. The articu- 
lations are numerous, five to eight millimeters distant ; the leaves scarcely 
three millimeters long. The direction of the branches, all in the same 
way and nearly parallel, shows that they were attached as branches to the 
same stem, and not displaced by water or by any kind of transportation. 
Like the fragments of fig. 1, they have been embedded at their place of origi- 
nal growth. This fact is rendered still more evident by the presence of 
small Serpulids (fig. 6c, enlarged ce), a considerable number of which are 
attached to the stems and strewed over the stone. 
The specimen bears also (fig. 63,) oval granulate protophytes : Xanthidia ? 
seen enlarged in 0d. 
Habitat. Same as the former species in the lower Helderberg sandstone 
formations of Michigan. The compounds of the specimens are still harder 
and more calcareous. Found like the former, and communicated by Dr. 
Carl Rominger. 
cavity divided by transverse membranes, either passing through the whole 
diameter, or connected in the middle to vertical subdivisions. 
The internal parieties, irregular in distance and thickness, are distinctly 
seen through the smooth epidermis, which, moreover, is often destroyed, 
the internal structure being thus clearly exposed. The cavity of the stem 
is inhabited by the same species of Serpulid as seen in fig. 6 e. 
