i88ij 
Analyses of Booh . 
357 
A Monograph of the Silurian Fossils of the Girvan District in 
Ayrshire , with Special Reference to those contained in the 
“ Gray Collection .” By H. Alleyne Nicholson, M.D., 
D.Sc., &c. Fasciculus III. Edinburgh and London : W. 
Blackwood and Sons. 
This portion of Dr. Nicholson’s work is devoted to the Annelids 
and Echinodermata, with Supplements on the Protozoa, Ccelen- 
terata, and Crustacea, and contains descriptions of the genera 
Clathrodictyon, Hyalonema. Heliolites, Plasmopora, Propora } 
Pinacopora , Halysites, and Favosites. The Supplements refer to 
the Crustacean order Trilobita, to the Thoracica (Cirripedia), and 
to certain Annelida. Here the author examines the so-called 
worm-tracks of the Girvan District, a kind of organic remains 
explained by some authorities as the trails of wandering Anne- 
lides, by others as tracks made by Mollusca or Crustacea, while 
others ascribe to them a vegetable origin. 
The illustrations to the work are of a very satisfactory cha- 
racter. 
Records of the Geological Survey of India. Vol. XIV., Part i. 
1881. 
From the annual report it appears that Mr. Griesbach has 
attempted to correlate the rocks of Peninsular India with those 
of the Himalayas and of the world beyond the seas. 
It is proposed to establish an office of mining records in 
Bengal. 
M. Lydekker, in a Report on the Geology of Dardistan and 
Baltistan, notices the size of its glaciers in the present day. 
That at Biafo is probably next to the Humboldt glacier of Green- 
land, the largest in the world. The present lower limit of 
glaciation is about 10,000 feet above the sea-level. The Palma 
glacier is pronounced to be decidedly increasing, though at one 
time it may have united with that of Biafo. The author con- 
cludes that the glaciers of the Himalaya were once of vastly 
greater extent than at present, but that there is no evidence of a 
continuous ice-cap over the summits of the mountains. He 
considers that the glaciation of Europe and the Himalayas was 
contemporaneous, and that the degree of cold experienced must 
have been far greater than at present. 
M. Lydekker likewise furnishes a valuable Report on some 
Siwalik Carnivora. 
