I 
](*) 
Ti'eninjiol an ();*c*urs in tlio Niagara (Jroup of North Ainori{*a, and in the 
(M|iiiv’alont horizon in Enroj)o, tin; Wonlock Scries ; and although Bucanla 
is not known in Australian Carl)onilcrous rocks, notwithstanding its otherwise 
wide geographical range, represcnitatives of the family Jlellerophontid:c arc 
found in the IJp[)cr Marine Scries of New South AVales. 
“The view of Dr. (). Feistmantel as to the Triassie age of the llawkes- 
hury Series appears to ho now generally accepted, based on the nature of its 
ilora, and has been adopted by Mr. C. S. AVilkinson.* Aecepting this view 
as probably the correct one, so far as our knowledge of the llaw'keshury flora 
at present exists ; and, looking to tlie iirmly established position of the group 
ol‘ beds above tbe Carboniferous Series, we are constrained to regard the 
f)ccurrence of Tremanotas in tlie Ilawkesbury Sandstone as a reappearance of 
a member of the Bellerophontidm, similar to that of the little Bellerophina 
in th.e Cretaceous Period. I do not otherwise perceive how it is to l)e accounted 
for, Avhen we remember that the Carboniferous fauna, of whicb the Bellero- 
phontidye form an important factor, died out at the close of the Upper Marine 
Series, almost completely, and that between this horizon and that of the 
Jlawkeslmry rocks avc have the whole of the U])per Coal Measures without 
an invertebrate fauna. AVith the view of arriving at a more accurate 
conclusion, let us examine the characters of the two genera more minutely. 
Bncmiia was cstablishedf by Professor James Hall, of Albany, ‘to include 
several species of shells of a pecidiar form, usually referred to Bellerophou, 
but from which they differ in liaving all the volutions visible, and gradually 
increasing in size The Bellerophou coruaarieles, of Sowerby (Alin. 
Conch., Tab. 400, f. 2) Avill fall under this genus.’ The name is derived 
from (ivKavr], a trumpet, which exceedingly well exemplifies the form of the 
shell, the whorls enlarging rapidly, with an expanded aperture, the last one 
being carinate along the median line of the back. Tremanotas is described 
thusf by the same author : ‘ Volutions apparently in the same 2 )lane ; 
umbilicus on both sides ; aperture expanded ; the dorsal lino pierced by several 
oblong perforations.’ On the species Tremanotas alpheus he remarks : ‘ The 
s})ecimen is a cast of the interior of the shell, and along the periphery presents 
a range of elongated oval prominences which have apparently been perforations 
in the shell, arranged at e(|ual distances from each other.’ Now, a comparison 
between the characters of the two genera and those of the Ilawkesbury fossil 
* OlHcial Record, Sydney International Exliiliition, 1879 (1881), pp. 50 and 04; N. S. Wales Official 
Catalogue, Colonial and Indian Exhibition, 1880, p. 100. 
t Pal. New York, 1847, 1, p. 32. 
7: 20th Annual Report, Regent’s Univ. State New York, Cabinet Nat. Hist., 1807, p. 347. 
