302 REFERENCES. 



63 Thacher, James K. Median and Paired Fins ; a Contribution 

 to the History of Vertebrate Limbs. Transactions Connecticut 

 Academy, III. No. 7. 1877. pp. 281-310. Plates 49-60. 



64 Weiss, F. Ernest. Excretory Tubules in Amphioxus lanceolattis . 

 Quarterly Jour, of Micro. Sc. XXXI. N. S. 1890. pp. 489-497. 

 Plates 34-35- 



65 VAN WijHE, J. W. Ueber Amphioxus. Anat. Anz. VIII. 1893. 

 pp. 152-172. 



66 VAN WljHE, J. W. Die Kopfregion der Cranioten beim Amphi- 

 oxus, nebst Bemerkttngen ilber die U'irbeltheorie des SchUdels. 

 Anat. Anz. IV. i88g. pp. 558-566. 



67 VAN WljHE, J. W. Ueber die Mesodermsegmente des Rtimpfes 

 und die Entwicklung des Excretionssystems bei Selachiern. Archiv. 

 f. Mikr. Anat. XXXIII. 1889. pp. 461-516. Taf. 30-32. 



68 WiLLEY, Arthur. Report on a Collection of Amphioxus, made 

 by Professor A. C. Haddon, in Torres Straits, 1888-89. Quarterly 

 Jour. Micro. Sc. XXXV. N. S. January, 1894. pp. 361-371. One 

 figure in text. 



Branchiostoma cultellum. Peters. 



III. 



DEVELOPMENT OF AMPHIOXUS. 



69 Ayers, Howard. Bdellostoma Dombeyi,Lac. A Study from 



the Hopkins Marine Laboratory. Biological Lectures, Marine 

 Biological Laboratory, Woods Holl. 1893. No. VII. Boston, 

 1894. 



69 bis. Bert, Paul. O71 the Atiatomy and Physiology of Amphioxus. 

 Annals and Mag. of Nat. Hist., 3d Series. Vol. XX. 1867. 

 pp. 302-304. (Translated from Comptes Rendus. Aug. 26th, 

 1867. pp. 364-367.) 



Breeding season of Amphioxus at Arcachon is from March to 

 May. Was the first to observe the ejection of the sperm through 

 the atriopore. Calls attention to remarkable lack of regenerative 

 power in Amphioxus. Individuals cut in two will live for several 

 days, but will not regenerate. "If the extremity of the body of 

 an Amphioxus be cut off, the wound does not cicatrize ; on the 

 contrary, the tissues become gradually disintegrated. I have 

 seen animals, with only the tail mutilated, become gradually 

 eaten away up to the middle of the branchial region, and live 

 thus without any intestines, without abdominal walls, and without 

 branchiae for several days." These observations of Paul Bert are 



