REFERENCES. 303 



capable of easy confirmation, and should be borne in mind in 

 view of the extraordinary regenerative power which Wilson dis- 

 covered in the segmentation stages of the embryo. 



70 BOVERI, THEODOR. Uber die Bildungsstatte der Geschlechts- 

 tf n't sen und die Entstehiing der Genitalkammern bciin Atnphi- 

 oxns. Anat. Anz. VII. 1892. pp. 170-81. Twelve figures. 



71 DOHRN, ANTON. Stitdien zitr Urgeschichte des U'irbelthier- 

 korpers. III. Die Entstehiing und Bedeittung der Hypophysis 

 bei Petroniyzon Planeri. Mitth. Zool. Stat. Neapel. IV. 1882. 



72 DOHRN, ANTON. Studien, VIII. Die Thyreoidea bei Petromy- 

 zon, Amphioxus und 7^/nicafen. Ib. VI. 1885. 



Dohrn lays unnecessary stress upon the fact that often in 

 transverse section, especially in the anterior region of the 

 pharynx, the endostyle of Amphioxus projects up into the cavity 

 of the pharynx in the form of a convex lens-shaped ridge. This 

 is merely due to the muscular contraction of the pharynx, which 

 almost invariably takes place when Amphioxus is placed in a 

 killing reagent. It is, therefore, not an anatomical feature of 

 any significance. 



73 DOHRN, ANTON. Studien, XII. Thyreoidea nnd Hypobran- 

 chialrinne, Spritzlochsack nnd PseudobrancJiialrinne bei Fischen, 

 Ammoccetes und Tunikaten. Ib. VII. 1887. 



74 DOHRN, ANTON. Studien, XIII. Uber Ner-ven und Gefdsse 

 bei Ammoccetes und Petromyzon Planeri. Ib. VIII. 1888. 



75 FRORIEP, AUGUST. Entwickelungsgeschichte des Kopfes. 

 Ergebnisse der Anat. und Entwickelungsgesch (Merkel und 

 Bonnet), I. 1891. pp. 561-605. Eleven figures. 



Includes an extensive bibliography. 



76 HATSCHEK, BERTHOLD. Studien uber Entivicklung des Amphi- 

 oxus. Arbeiten a. d. Zool. Institute. Wein, iSSi. 88 pp. 

 Nine plates. 



77 HATSCHEK, BERTHOLD. Mittheilungen uber Amphioxus. 

 Zoologischer Anzeiger, VII. 1884. pp. 517-520. 



Olfactory pit, sense-organ of praeoral pit, anterior preoral 

 u nephridium." 



78 HATSCHEK, BERTHOLD. Uber den Schichtenbau von AmpJii- 

 oxits. Anat. Anz. III. 1888. pp. 662-667. Five figures. 



Origin of sclerotome, etc. 



79 KASTSCHENKO, N. Zur Entwicklungsgeschichte des Selachier- 

 embryos. Anat. Anz. III. 1888. pp. 445-467. 



One of the first to bring forward definite embryological facts to 

 prove that the anterior (prae-auditory) head-cavities of VAN WIJHE 

 (Ueberdie Mesodermsegmente, etc., des Selachierkopfes. Amster- 



