THE PRINCIPLES OF BIOLOGY. 
99 
Lepidopliyllum ? 
Lepidostrobus (macrospores of). 
Sphenopliyllum ? 
Rliacophyllum ? 
Trigonocarpum olivaeforme ? 
Splienopteris ? 
Cordiates. 
Pseudopecopteris nervosa ? 
Calamities cannaeformis ? 
Halonia ? ( a tubercle of ?) 
Odontopteris. 
Tree-fern stalks ? 
Seed-vessels? (a group of). 
Lycopodites vanuxemii ? Dawson. 
Rootlet of Stigmaria ficoides ? 
Fungus? (two species). 
Fauna :— 
Antbracosia aequilinus ? 
A. (another species). 
Antliracoptera ? 
Lingula ? 
Rliynchonella ? R. Etheridge. 
Entomostraca ? 
Arthropoda (leg of an insect), H. Woodward. 
A. (probably parts of two legs of a small scorpion-like 
form). 
Fish bones ? 
Worm castings of various dimensions. 
THE PRINCIPLES OF BIOLOGY. 
BY HERBERT SPENCER. 
Exposition of Part III. Chapter V. 
BY DR. WILLIAM L. HIEPE. 
The first remarkable fact that arrests our attention in the 
study of embryology is expressed by Yon Baer in the following 
words:—“In its earliest stage every organism has the greatest 
number of characters in common with all other organisms in 
their earliest stages ; at a stage somewhat later its structure 
is like the structures displayed at corresponding phases by a 
less extensive multitude of organisms ; at each subsequent 
