Mr. A. Agassiz on the Young Stages of a few Annelids. 203 



1810. Kritiscbe Bemerkungen zu den Becherflecliten in der Lie/tewo- 



ffraphia universalis von Dr. Erik Acharius. 19 p. iu-4to. 



Most of the remarks of Florke are very just, and Acharius 

 has attended to them in his Synopsis. 



1811. Einige Lichenen von Karatschatka und der benachbarten Inseln. 



Description of eighteen species of common lichens, collected 

 in Asiatic Russia by Tilesius. 



3. In Beitr'dge zur Naturlcunde von Weber, Bd. ii. 1810: 



Einige Bemerkungen iiber das Umbestimmte des Begriflfs der Varie- 



taten im Pflanzenreiche. 27 p. in-8vo. 

 Beschreibung der braunfriichtigen deutschen Becherflechten. 64 p. 



in-8vo. 



4. In Beisters Berliner Monatschrift, 1804 : Einige allgemeine Bemer- 



kungen iiber das Salzburgische Gebirge. 



5. Deutsche Lichenen gesammelt und mit Anmerkungen herausge- 



geben von H.-G. Florke. Atlas in-folio, text in-8vo; liv. i.-iii. 

 Berhn, 1815; liv. iv.-vi. Rostock, 1819: liv. vii.-x. Rostock, 

 1821. 



6. De Cladoniis, difficiUimo Lichenum genere, commentatio nova. Ros- 



tochii, 1828, in-8vo. 



7. Cladoniarum exemplaria exsiccata, commentationem novam illus- 



trantia. Rostock, 1829, fasc. i.-iii. (60 N^). 



8. In the Calendar of Mecklenburg, 4to, a very great number of po- 



pular articles on physical geography, astronomy, and palaeontology. 



9. In the Freimiithliche Ahendbldtter (a weekly journal of popular science 



at Mecklenburg), many articles on popular natural history. 



10. In "Neue Annalen der Mecklenhurgischen Landwirthschaft-GeselU 

 schaft, for 1820, a long dissertation on spontaneous generation 

 in the animal and vegetable kingdoms. (Florke admitted sponta- 

 neous generation, as did most of the writers of his time.) 



11. In the journal Vandalia of l)r. Masius, 1819, fasc. ii.-vi., many 

 notices of physics and of meteorology. 



In terminating this biographical notice of Elorke, it is my 

 pleasing duty to offer my best thanks to my excellent friend 

 M. J. Roeper, Professor of Botany in the University of Rostock, 

 who, during my sojourn in that town, with the greatest courtesy 

 procured me every kind of information concerning its former 

 Professor. 



XXXV. — On the Young Stages of a few Annelids, 

 By Alexander Agassiz*. 



[Plates V. & VI.] 



The study of immature animals has become so important that, 

 before proceeding to my subject, it may be of some interest to 

 those engaged in investigating marine animals, to know how the 

 young may be collected. Johannes Miiller was the first who 

 successfully employed surface-dredging with a fine gauze hand 



* Reprinted from the * Annals of the Lyceum of Natural History of New 

 York/ vol. viii., June 1866. 



14* 



