295 
Devon and Cornvoall, Belgium^ the Eifel, 
in transition and carboniferous strata. If we compare to- 
gether the labours of M. Von Buch, Count Munster, M. 
Beyrich, and Professor Phillips, on this subdivision of the 
tribe of the Ammonites, the general result is that in the older 
transition rocks the Goniatites met with possess a simple dorsal 
lobe, whilst those which occur in the carboniferous series have 
a divided dorsal lobe. If this observation were rigidly exact, 
it might be adopted as a distinctive character between strata 
of the transition and carboniferous epochs respectively ; and 
it might also be inferred that limestones which contain Gonia- 
tites, some of which possessed a simple and others a divided 
dorsal lobe, might be considered as occupying an intermediate 
station, that is, as belonging to the later portion of the transi- 
tion series. But in neither case does the rule appear to hold 
without exceptions. Thus, of the 26 species of Goniatites 
noticed by Count Munster in the Fichtelgebirge, the 22 (four 
being doubtful) which are strictly defined and figured, have 
all a simple dorsal lobe; but two other species are figured by 
M. Von Buch, as derived from thence, with a divided dorsal 
lobe, namely. Ammonites ineequistriatus^ tab. ii. fig. 10, and 
A. semistriatusi tab, ii. fig. 12^. Of 8 other species described 
and figured by Von Buch, and referred to but not figured 
by M. Beyrich, 5 are found in transition tracts, and four of 
these have a simple dorsal lobe, and one a divided dorsal lobe; 
while of the three species found in the carboniferous series, two 
have a simple and one a divided dorsal lobe. M. Beyrich has 
described 18 species of Goniatites, and 14 of these are figured, 
but in 12 only are the dorsal and lateral lobes given, and of 
10 of these which are derived from transition tracts, five have 
a simple and five a divided dorsal lobe; while in the two found 
in the carboniferous series the dorsal lobe is divided. M. 
Beyrich enumerates (including the eight new species desig- 
nated by himself) altogether 42 species of Goniatites, the 
greater number being derived from the researches of Count 
Munster and M. Von Buch, and a few from the descriptions 
given by Professor Goldfuss and MM. Martin and Sowerby. 
Of this list four or five species only are referred to the car- 
boniferous series. Professor Phillips enumerates 33 species 
of Goniatites as occurring in the carboniferous system of 
Great Britain and Ireland!, Of these he has represented 
the dorsal and lateral lobes of 24 species, out of which 21 
* Von Buch, Ueber Goniatiteriy in the Transactions of the Royal Academy 
of Sciences of Berlin, December 15, 1831. 
t Ilkistrations of the Geology of Yorkshire, part ii. 1836. Mountain 
Limestone District. 
