292 Belege und Citate. 



15 A. a. 0.: „Non multum a veritate me aberraturum con- 

 fido, si dixerim, omnem continentem terram fuisse in infan- 

 tia mundi aquis submersam et vasto oceano obtectam, prae- 

 ter unicam in immenso hoc pelago insulam, in qua commode 

 habitaverint animalia omnia etvegetabilialaete germinaverint." 



16 „Tot numeramus species, quot ab initio creavit infini- 

 tum ens." 



17 E. Geoffroy St.-Hilaire schrieb an Cuvier: ,,Venez 

 jouer parmi nous le röle de Linne, d'un autre legislateur de 

 l'histoire naturelle." 



18 Ossements fossiles. 



19 L. Agassiz, An Essay on Classification, 1859, S. 253.: 

 „As representatives of Species, individual animals bear the 



closest relations to one another; they exhibit definite rela- 

 tions also to the surrounding element and their existence 

 is limited within a definite period. 



„As representatives of Genera, these same individuals have 

 a definite and specific ultimate structure , identical with that 

 of the representatives of other species etc. — Dazu S. 261: 



„Brauches or types, are characterized by the plan of their 

 structure; 



„CJasses, by the manner in which that plan is executed, 

 as far as ways and means are concered; 



„ Orders, by the degrees of complication of that structure ; 



„Families, by their form, as far as determined by structure ; 



„Genera, by the details of the execution in special parts ; and 



„Species, by the relations of individuals to one another 

 and to the world in which they live, as well as by the pro- 

 portions of their parts, their ornamentation etc." 



20 Haeckel, Generelle Morphologie der Organismen (Ber- 

 lin 1866), II, 323 fg. 



21 L'espece est — „la reunion des individues descendant 

 l'un de l'autre et des parents communs, et de ceux qui 

 leur ressemblent autant qu'ils se ressemblent entr'eux", 

 Cuvier, Le regne animal. 



22 0. Schmidt, Die Spongien der Küste von Algier, 1868, 

 und Versuch einer Spongienfauna des atlantischen Gebietes, 

 1870. 



23 Haeckel, Die Kalkschwämme. Eine Monographie in 

 zwei Bänden Text und einem Atlas mit 60 Tafeln Abbil- 

 dungen (Berlin 1872). 



2i Hilgendorf , Ueber Planorbis multiformis im Steinheimer 

 Süsswasserkalk. Monatsbericht der Berliner Akademie aus 

 dem Jahre 1866, S. 474 fg. 



25 Waagen, Die Formenreihe des Amnionitis subradiatus. 

 Beneke's Beiträge, 1869, Bd. 2. 



