ADVERTISKMENTS. 
3 
NEW WORKS PUBLISHED 
AT THE "GEOLOGIST" OFFICE, 156, STRAND. 
Now ready, 8vo., ivtth Five 4to. Plates, price 7s. Gd. 
A MONOGRAPH OF THE SCOTTISH CARBON- 
IFEROUS BRACHIOPODA. 
BY THOMAS DAVIDSON, Esq., F.R.S., F.G.S. 
London : " Geologist" Office, 156, Strand. 
SIR RODERICK I. MURCHISON'S 
NEW GEOLOGICAL 
SKETCH MAP OF SCOTLAND. 
This Map, containing the recent most important groupings of the Scotch Rocks 
by Sir Roderick I. Murchison, is, under his authority, now published at the 
" Geologist" Office, 156, Strand, accompanied by an Explanation of the 
Details. 
London : " Geologist" Office, 156, Strand, and through all Eooksellers. 
Price Is. 6d. 
FOSSILS DISCOVERED IN THE EXCAVATIONS FOR THE MAIN 
DRAINAGE. 
TO GEOLOGISTS, NATURALISTS, AND THE PUBLIC. 
GREAT NOVELTY.— NEW STEREOSCOPIC SLIDE. No. I., price Is., 
CYRENA DULWICHIENSIS ; a new and beautiful species of Estuarine 
Shell, discovered by Mr. Charles Rickman, Honorary Curator, Lambeth 
Museum of Natural History, in Lower Eocene Strata at Dulwich, 60 feet from the 
surface. Photographed from the original, as engraved in the Illustrated London 
News, Saturday, March 24th, 1860, and Oeologist for April. 
Published by J. Warxer, Optician, 72, Flcet-stroet, to whom all orders are to 
be addressed. 
N.B. — Sent free by post on receipt of 14 postage stamps. 
