NOTES. 479 



germ-history were given in very beautiful detail by M. P. Erdl 

 thirty years ago : " The Evolution of Man, and of the Chick in 

 the Egg" ("Die Entwickelung des Menschen, und des Huhnchens 

 im Ei." Leipzig, 1845). 



111 (i. 409). Fritz Muller, "Fur Darwin." Leipzig, 1864. 

 A very excellent little book, in which the modification of the 

 fundamental law of Biogeny (with reference to the Phylogeny of 

 Crustacea) are explained for the first time. 



112 (i. 413). The Method of Phylogeny is of the same 

 morphological value as the well-known method of Geology, and 

 may, therefore, claim exactly the same scientific acceptation. 

 Cf. the excellent discourse by Eduard Strasburger, "On the 

 Importance of Phylogenetic Methods in the Study of Living 

 Beings." " Jenaische Zeitschrift fur Natnrwissenschaft," 1874, 

 vol. viii. p. 56. 



113 (i. 415). Johannes Muller, " On the Structure and Vital 

 Phenomena of Ampliioxus lanceolatus." Transactions of the 

 Berlin Academy, 1844. 



114 (i. 415). Recent works on the Amphioxus. W. Rolph 

 and E. Ray Lank ester especially have recently added to our 

 knowledge of the organology of the Amphioxus, Wilhelm Muller 

 and P. Langerhans to that of its histology. The literature of 

 this subject is fully represented by W. Rolph, in his "Researches 

 into the Structure of the Amphioxus " (" Untersuchungen liber 

 den Ban des Amphioxus." "Morpholog. Jahrb.," vol. ii. p. 87, 

 Plates V. and VII.), and in P. Langerhans, " On the Anatomy of 

 the Amphioxus" ("Zur Anatomie des Amphioxus." "Archiv. 

 fur Mikr. Anat.," vol. xii. p. 290, Plates XII.-XV.). 



115 (i. 416). Acrania and Craniota. The separation of 

 Vertebrates into Skull-less Animals (Acrania} and Skulled 

 Animals (Craniota), which I first indicated in 1866 in my 

 " Generelle Morphologie," appears to me absolutely essential for 

 the phylogenetic explanation of the Vertebrate-tribe. 



116 (i. 428). Max Schultze, "History of the Evolution of 

 Petromyzon" ("Entwickelungsgeschichte von Petromyzon." Haar- 

 lem, 1856). The Ontogeny of the Hags, which promises very 

 important results, is yet, unfortunately, entirely unknown. 



