INTRODUCTION. vil 
death of the latter, in 1837, by way of California and the Philippines. His memory 
has been preserved amongst botanists by the name Deppea, given to a genus of 
Rubiacezee by Chamisso and Schlechtendal. A number of land, freshwater, and sea- 
shells collected by him are preserved in the Berlin Zoological Museum. 
C. A. Unpe was Prussian Consular Agent at Matamoros, near the mouth of the 
Rio Grande del Norte, about 1830-45. His botanical and zoological collections, 
including some land and freshwater shells (among others, Holospira imbricata, which 
has not since been met with), and many marine ones, from both the east and west 
coasts of Mexico, were acquired in 1862 for the Berlin Museum. It was upon this 
material, together with the specimens obtained by Deppe, that my paper on the 
“Mexican Land and Freshwater Shells,” in Pfeiffer’s ‘ Malakozoologische Blatter,’ vii. 
(1865), was based. 
Professor F. LresmMany, friend of the well-known Danish Prof. Japetus Steenstrup, 
travelled in 1840 from Copenhagen to Vera Cruz and Papantia. He afterwards 
crossed the country to the Pacific coast, and returned to Europe in 1843, as I have 
been informed by Dr. E. Warming, of Copenhagen. Specimens of land and fresh- 
water shells collected by him found their way into various private collections, as, for 
instance, those of Dr. L. Pfeiffer and Dr. R. A. Philippi, of Cassel, who described them 
in their works ‘ Monographia Heliceorum’ and ‘ Abbildungen und Beschreibungen 
neuer Conchylien,’ and also into that of Prof. Dunker, of Marburg, whose Mollusca 
have now been acquired for the Berlin Museum. 
Car. PirscHen, Prussian Secretary of Legation, explored the Volcanoes of Mexico 
in 1853-54 ; and afterwards accompanied the Prussian Expedition to Eastern Asia, 
in 1859-62. He was honourably mentioned by A. v. Humboldt, in ‘ Kosmos,’ iv. 
pp. 428, 566, &c., and is the author of an instructive paper on the Mexican volcanoes 
in the ‘ Zeitschrift fiir allgemeine Erdkunde,’ vi. (1856). The Berlin Museum is 
indebted to him for an interesting species of Otostomus, found at Manzanillo, on the 
Pacific coast. 
Dr. Kart Hermann Berenpt, born at Danzig in 1817, left his country in 1851 on 
account of the political troubles of 1848. He lived for some time in Nicaragua 
(1853), the city of Mexico, Orizaba, and, finally (1855-62), in Vera Cruz, practising as 
a doctor. Here he met with the merchant HERMANN STREBEL, who was born in 1834 
at Hamburg, and represented his father’s firm in the city of Mexico in 1849-52, and 
