John H. Cooke—Filint and Chert in Maltese Limestone. 157° 
end is projected well backward, indicating great freedom of motion 
at the knee. 
The tibia is shorter than the femur, and has a prominent cnemial 
crest. The distal end is much flattened, and the astragalus is closely 
adapted to it. The fibula is very straight, with its lower end 
flattened and closely applied to the front of the tibia. The caleaneum 
is large, with its concave upper surface closely fitted to the end of 
the fibula. Of the second row of tarsals, only a single one appears 
to be ossified, and that is very small and thin, and placed between 
the calcaneum and the fourth metatarsal, nearly or quite out of sight. 
The hind foot, or pes, had but three digits, the second, third, and 
fourth, all well developed and massive. The terminal phalanges 
were covered with broad hoofs. The first and fifth digits were 
entirely wanting. 
The reptile here restored was nearly thirty feet in length when 
alive, and about fifteen in height in the position represented in 
Plate VII. The remains were obtained in the Laramie of Wyoming. 
Among the associated fossils were the gigantic Triceratops and 
Torosaurus, herbivorous dinosaurs, and with them the diminutive 
Cretaceous mammals recently described by the writer. 
TJJ.—Own tue OccurrENCcE oF ConcreTionaRy Masses or Fnint anv. 
Cuert In THE Mattress LIimMestones. 
By Joun H. Cooxez, F.G.S., ete. 
HE late Admiral Spratt, R.N.,’ and Dr. John Murray,? of the 
‘Challenger’ Expedition, have, in their brochures on Maltese 
Geology, made allusion en passant to the occurrence of chert nodules 
in the Globigerina limestones of the Maltese islands. Neither of 
these gentlemen, however, gave any details of the nature, mode of 
occurrence, or distribution of the concretions, an omission which was 
probably due to the restricted area of the horizon at which the 
nodules are found, and to the irregular and sparse manner in which 
they are distributed. 
The following notes on these points, which were collected in the. 
course of my geological investigations into the fauna of the formation, 
may not, therefore, be without some value to present and future 
students of Maltese geology. 
The Globigerina limestones in which the concretions occur occupy 
the second place in the ascending order of the Maltese formations. 
They attain a maximum thickness of about 250 feet, and comprise 
a series of layers or beds which vary in number in different 
localities from four to ten. Between the beds themselves the 
variations are but slight, and are of a chemical rather than of a 
lithological or a paleontological character, consisting generally of 
a greater or lesser percentage of carbonate of lime according to the 
1 «This deposit often contains nodules of a flinty texture, viz., chert, in which 
are fish-scales.’’ The Geology of Malta and Gozo. Malta, 1854, p. 7. 
* “ Nodules of flint and chert are found in some of the layers’? ‘‘ The Maltese 
Islands, with special reference to their geological structure.’’ Scot. Geog. Mag., 
September, 1890, p. 24. 
