= : T. Bland on the Geographical Distribution of Mollusca. 395 
_The “ Catalogue of Shells collected at Panama,” (New York, 
1852,) by Professor Adams, now claims our attention. 
The Preface commences with the following passage :— 
“The reader of the Introduction to this work, and of Dr. 
Gould’s Introduction to his great work on the shells of the Uni- 
ted States Exploring Expedition, may be struck with the coin- 
ence of opinions relating to the geographical distribation of 
Species, and to errors in the statement of habitats, and in the dis- 
tinctive characters of species. The coincidence is so exact, that 
it might naturally be supposed that these opinions originated in a 
single source. Such was their origin; but that source was the 
k of Nature. It was not until after both Introductions had 
been written, that opportunities occurred for a free interchange of 
views with Dr. Gould. It is therefore with the liveliest satisfac- 
tion that we derive assurance of their correctness both from the 
extent and accuracy of Dr. Gould’s knowledge, and also from the 
coincidence of the results of independent investigations.” 
Professor Adams visited Panama at the end of 1850, and in the 
tion, what and how many species of shells exist at Panama. 
but our limits will admit of little more than the following extract :— 
(€ 4 * 
Zoological province. Perhaps none of t tact 
Mollusca (to which part of the Fauna our remarks are limited) 
north of 23° N, lat., or west of the Gallapago Islands. All of the 
d to have a wider 
ce. 
d satisfactory method of defining the limits 
lace the boundaries at the extreme limits 
