could not discoyer any information. One of his early works 

 was produced in Vienna (1836); of the next work there is a 

 memorandum, Petersburg (1 83 7) , Later on Krohn was in 

 Heidelberg (18:59], and from 1840 he worked nearly continu- 

 ously on the shores of the Mediterranean Sea and the islands 

 of the Atlantic Ocean. In 1840 and later he was in Naples; 

 from the autumn of 1844 to the spring of 1845 in Messina; 1848 

 in Nice; 1850 in Naples. In the beginning of 1835 and the 

 winters of 1853/54 and 1856/57 he again was in Messina; in 

 the winter 1855/56 and the spring and summer of 1865 he 

 worked in Funchal (in Madeira) and in Santa Cruz (Tenerif e) . 

 In December 1860, in May 1861 and in 1867 Krohn was in Nice, 

 and in the first half of the year 1869 he was in Naples. In 

 the intervals between travelling he lived in Paris (winter of 

 1851/52, spring of 1857) and in Bonn (summer months of 1851, 

 1853, 1855, 1857 and 1859, winters of 1859/60, 1864/65 and 

 1856/66, and also the second half of the year 1869) . 



Concerning the last twenty years of Krohn 1 s long life of 

 eighty-eight years there is again no information. 



During his travels Krohn maintained contact with his 

 country, as seen by the report of the conference of the 

 Academy of Science in Petersburg, which presents the 

 following records: 



"Mr. August Krohn is a doctor who is famous for his works 

 on anatomy and physiology. He has sent the Academy a signifi- 

 cant collection of invertebrate sea animals which was collected 

 by him near Naples, which, in quantity and quality, deserve 

 the thanks of the Academy" (Report from December 16, 1842) . 



"Dr. Krohn sent again, as a gift to the Academy Museum, 

 two new collections, about one hundred species of fish, 

 crustaceans and others" (Report of September 13, 1844). 



On the 7th of November 1855 Krohn was recommended as 

 candidate for corresponding member of the Academy of Science 

 in Petersburg, hit was not elected. The biographical data 

 given during this presentation shows only that he was born in 

 Petersburg, lived abroad, and wrote about thirty valuable works 

 dedicated to molluscs (IPaludina, Phyllirhoe and oephalpoda) , 



562 



