AND DISTRIBUTION OF TRILOBITES. 289 
from the grauwacke the Homalonotus Ahrendi, which I cannot 
distinguish from H. Knightii. Neither description nor figure 
shows with any degree of certainty whether Calymene Jordani is 
a species already described or a new one. It sufficiently appears, 
however, from the figure to belong to the division of the con- 
tractile species of Phacops with lateral lobes of the forehead, 
which has hitherto only been known from the Silurian system, 
but both from the lower as well as from the upper divisions. 
The Hartz can therefore only be proved from the Trilobites 
to possess the upper Silurian group; neither the Trilobites nor 
any other fossils that have hitherto been found there are suffi- 
cient to support Dr. Reemer’s rather precipitate assertion that all 
the subdivisions of the English Silurian system are again met 
with in the Hartz. It is certainly possible, but cannot yet be 
proved. We likewise are only acquainted with very few animal 
remains of this order from the beds on the dip side of the grau- 
wacke of the Hartz; we may however infer a Devonian forma- 
tion from the caudal shields of Brontes, which were found in the 
limestone (abounding in fossils) of the Wiuterberg near Grund, 
and from that of the Scheerensteig in the valley of the Selke ; 
and the other fossils found there also favour this supposition. 
Want of space, I regret to say, necessarily limits me to a few 
remarks on the most subdivided of the German transition rocks, 
and which most abound in Trilobites, those of the Lower Rhine. 
Grauwacke and grauwacke-slate likewise predominate here; they 
contain Homalonoti (Knightii, Herschelii) and Calymene ; it still 
requires further confirmation whether the true C. Blumenbachii, 
which Murchison enumerates, occurs among them. The Eifel 
limestone is more important, indeed the most important, of the 
German Trilobite deposits. It is superposed in several isolated 
hills, saddle-like, on the grauwacke, surrounded entirely by the 
latter, and partially projecting above it in the form of high 
rocky cliffs. Gerolstein and Blankenheim are the principal lo- 
calities of the numerous and interesting Trilobites described by 
Professor Goldfuss. From these localities are Phacops arach- 
noides, Goldf., macrophthalmus, Brong. (which are neice 
numerous), Harpes macrocephalus, G., Brontes flabellifer, G., 
Gerastos, and others. Some of them are peculiar to the Hifel, at 
least they have not yet been found anywhere else ; others how- 
ever also occur in Devonshire (Harpes, Brontes, Phacops ma- 
crophthalmus) in association with other characteristic Hifel fossils 
