Silurian. } PALAONTOLOGY OF VICTORIA. [ Graptolites. 
with my previously defined genus Didymograpsus. The following 
remarks quoted from his work will show, I think, that this is so 
definitely made clear, that the genus Dicranograptus of Salter, 
adopted by Professor Hall, is unnecessary, and the more recent 
uses by other writers of the generic name Cladograpsus in different 
senses are not desirable— 
“Die Arten dieser Gattung vertheilen sich in zwei natiirliche Gruppen, je 
nachdem die Basis ihres Polypenstockes, bevor die Theilung in Arme oder Zweige 
beginnt, mit Zellen versehen ist, oder nur als glatter, einfacher oder zweiwurzeliger 
Stiel erscheint, mit welchem der Kérper sich einst im Schlamme einsenken Konnte. 
(a) “ Der Polypenstock entwickelt sich anfiinglich wie Diplograpsus, und triigt 
demnach an beiden Seiten eines durch die solide Axe gestiitzten Kanales Reihen 
von Zellen ; spiiter thielt er sich entweder in 2 oder in 3 Arme, und im letzteren Falle 
kann sich die Theilune des mittleren Armes wiederholen. Bis jetzt sind bei der 
zweiten Theilung nur wieder 2 Arme beobachtet worden, was jedoch nicht die 
Moelichkeit einer mehrfach wiederholten Theilung ausschliessen kann.” 
Our Australian specimens seem perfectly identical in all respects 
with the American ones ; the slightly narrower cell-indentations and 
less broadly truncated outer margin between the cells in our figures 
being only the result of a slightly oblique compression in the 
portions represented, other parts agreeing in these respects com- 
pletely with the New York Utica Slate examples, and with those 
recognized by me in the North of England. 
Not uncommon in the white Llandeilo flags of B* 64 and in 
the black flags of B* 62, N.W. of Bulla. 
EXPLANATION OF FIGURES. 
Plate XX —Fig. 2, specimen with the basal portion perfect and the branches imperfect, 
natural size. Fig. 2a, portion of ditto magnified. 
Pirate XX., Fia. 7. 
CLADOGRAPSUS FURCATUS (Hatz sp.). 
DrscrtpTion.—Base very short, of only 1 or 2 pairs of cells; branches about 
24 inches long, sigmoidally curved so as to overlap or cross each other at about 3 of 
the length, near the change of direction of the curves, which are in symmetrically 
opposite directions in the opposite branches, converging again towards the apex ; 
[ 34] 
