0») 
Entomolithus Paradoxus, proposed by Linné, was ap- — 
plied to all the fossil remains, which in their general % 
appearance bore any resemblance to that found at : 
Dudley, and which he first described under that 
name. The confusion, therefore, which existed in 
this department of natural science, may readily be 
imagineds especially, as the species rapidly multi- — 
plied, when they were supposed to throw some rays 
of light on certain obscure geological phenomena. — 
Soon after the appearance of Professor Brongniart’s 
excellent work, the attention of other naturalists was 
directed to this neglected part of creation. The 
most important memoir, on account of the number of 
species, well figured and described in it, is one by 
Dr. E. W. Dalmann, published in the Transactions of 
the Swedish Academy, for 1826. There is also in 
the Acts of the Royal Society, at Upsal, an excellent 
paper on this subject by Professor Wahlenberg. 
Our highly esteemed friend, Dr. James E. Dekay, 
has also given in the first volume-of the Annals of 
the Lyceum of Natural History of New York, some 
very interesting and ingenious observations on the 
nature and the structure of the Trilobites, with a de- 
scription of a new genus. These are the principal 
authorities which have been consulted in arranging — 
the present work. : 
Our object in the present undertaking being mere- 
ly to give a monograph of the species of Trilobites 
which he is the director, will no doubt acknowledge that his 
talents as a philosopher, are rivalled by his accomplishments as 
a gentleman. mre 
