Vertebrate Palaeontology. — Eyerman. 47 
ing to the tabulation of Mr. David Stevenson,* a current of 
three feet per second, or 2.145 miles per hour, suffices to 
sweep along pebbles the size of an egg. Thus we know that 
the bottom current was upwards of two miles per hour. 
It would be far-fetched to attempt to apply the principle 
here dwelt upon to the solidified rocks. Yet in the case tic- 
scribed the appearance is so deceptive that it emphasizes the 
danger of the hasty application of rules, without a study of 
each individual case. 
VERTEBRATE PAL/EONTOLOGY AT THE CO- 
LUMBIAN EXPOSITION; A BRIEF NOTICE. 
By John Eyerman, F. Z. S., P. G. S. A., Ka'ston, Pa. 
Vertebrate palaeontology in the Mines and Mining building- 
was represented by a few and (with the exception of the 
New South Wales exhibit) small and isolated collections. 
The best exhibit by far, and, in fact, the only one worthy of 
notice, is in the New South Wales section; in fact, it would 
not be an exaggeration to say that, apart from the fossils, this 
section, ^representing principally, as it does, the mineral in- 
dustry of that colony, is unquestionably the best and most 
interesting in the building. 
In this country's exhibit there is a remarkably good collec- 
tion of fossil fish from the Hawkesbury beds of the Mesozoic, 
which beds are characterized by the absence of the vertebral 
centra in the fossils, and, according to Woodward. + are honio- 
taxial with the Keuper or perhaps the Kinetic. Woodward's 
new Dipnoi genus Gosfordia\ truncata is here shown by se\ 
eral good specimens. Of the ganoids there are a number of 
specimens of Pristisomus gracilis, several of P. latus and one 
of P. crassus, several of Dictyopyge symmetrica, Clithrolepis 
If fit n it la 1 us, Peltopleurus dubius, Belonorhynchus gracilis, Myr 
iolepis sp., and a new genus Apatoiepis australis Wood. 
In the Japanese section, a good specimen of a teleostean is 
represented by a new species of Leuciscus. This individual 
*Quoted ia Encycl. Brit., Art. Geology. 
tMem. Geol. Sur. N. S. W., No. 4, Pal., pp. 55, pi., Sydney. L890. 
JNamed from the locality, Gosford. 
