notes. 479 



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

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

 the Egg" ("Die Entwickelung des Menschen, mid des Hiihnchens 

 imEi." Leipzig, 1845). 



111 (i. 409). Fritz Miiller, "Fiir 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 fiir Naturwissenschaft," 1874, 

 vol. viii. p. 56. 



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

 Phenomena of Amr)liioxus lanceolatus." — Transactions of the 

 Berlin Academy, 1844. 



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

 and E. Bay Lankester especially have recently added to our 

 knowledge of the organology of the Amphioxus, Wilhelm Miiller 

 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 iiber 

 den Bau 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. 

 fiir 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. 



