REFERENCES. 3OI 



belthiere. In Denkschriften der Math.-Naturwiss. Classe der kais. 

 Akad. der Wissenschaften. Bd. XLV. Wien, 1882. 64 pp. 4=". 

 Six plates. 



Relates chiefly to nervous system. Describes also the smooth 

 muscle-fibres in wall of pharynx, etc. Finds that the majority of 

 sensory nerve-fibres to the skin end freely between the cells of the 

 ectoderm in bush-like ramifications. For the rest, see Nansen 

 ROHDE, Retzius, and Fusari. 



55 RoLPH, W. Untersiichiingen iiber deii Ban des Amphioxus 

 lanceolatus. Morphologisches Jahrbuch, II. 1876. pp. 87-164. 

 Taf. V.-VII. ; also figures in text. 



36 RuCKERT, Johannes. Entwickelung der Exzretionsorgatie. 

 Ergebnisse der Anatomie und Entwicklungsgeschichte (Merkel 

 und Bonnet), I. 1891. pp. 606-695. Includes an extensive bibli- 

 ography. 



57 Schneider, Anton. Bei/riige zur vergleichenden Anatomie 

 iind EntuiicklnngsgeschiclUe der VVirbelthiere. /. Ai/iphioxus 

 lanceolatus. pp. 3-31. Taf. XIV. -XVI. 4°. Berlin, 1879. 



58 SCHULTZ, Alexander. Zur EntunckelungsgeschiclUe des Sela- 

 chiereies. Archiv. fiir Mikr. Anat. XI. 1875. PP- 569-580. 

 Taf. 34. 



Preliminary notes of both Semper and Schultz, regarding the 

 segmental origin of the excretory tubules, were published in the 

 Centralblatt fiir Medicinische Wissenschaft, 1874. 



59 Seiion, Richard. Studien iiber den Baiiplan des Urogenital- 

 sy stems der IVirbelthiere ; dargelegt an der Entwickelnng dieses 

 Organsystems bei fcldliyophis glntinostis. Jenaische Zeitschrift, 

 XXVI. 1891. pp. 89-203. Taf. I.-XIV. 



60 Spengel, J. W. Beitragziir Kenntniss der Kiemen des Amphi- 

 oxus. Zool. Jahrbiicher. Abth. fiir Morphol. IV. 1890. pp. 257- 

 296. Taf 17-18. 



61 Spengel, J. W. Benhani's Kritik meiner Angaben iiber die 

 Kiemen des Amphioxus . Anat. Anz. VIII. 1893. pp. 762-765. 



62 Stieda, Ludwig. Studieit iiber den Amphioxus lanceolatus. 

 Mem. de TAcad. Imp^riale des Sciences de St. Petersbourg, 7th 

 series, Vol. XIX. No. 7. 70 pp. Four plates. 1873. 



Contains some good observations on the central nervous system. 

 First to show that the split-like structure above central canal did 

 not correspond to the posterior fissure of the vertebrate spinal cord. 

 but was a portion of the original central canal itself, the lumen of 

 which had been partially obliterated by approximation of its walls. 

 First identification of ventral (motor) roots of spinal nerves in 

 Amphioxus. 



