SOUTH Al'KICA MEDAL. XXXI 



degenerate calcified teeth, but rather as primitive, purely ectodermal 

 striictures. They mav be considered as the first stage in the evolution 

 of the ordinary calcified teeth of vertebrates. Dr. ^Yarren also showed 

 that the maxillary gland .of the free-swimming Nauplius larva of a 

 freshwater Crustacean, Leptodora hyaJina. was purely ectodermal in 

 origin and thus may be homologised embryologically with the nephridia 

 of Cheetopoda. 



Since his appointment to the Natal Museum, in 1903, Dr. Warren 

 has founded and edited a well-illustrated scientific .iournal. the " Annals 

 of the Natal Museum," in which, in addition to contril)utions by himself, 

 important papers have appeared on South African biological research. 



Considerable attention has lioen given by Dr. "Warren to the Hydroid 

 fauna of the South African coast. Many new species have been described, 

 and true parasitism among the Hydroids was demonstrated for the first 

 time. 



Of a more popular character. Dr. Warren has written articles on 

 "Mammals and Birds of Natal," '' Soutli African Birds of Economic 

 Value," and various museum reports and catalogues. 



The following- is a list of Dr. Warren's published papers : — 



1. " Variation in rortiuiiis dcpuiator.'' Proc. Boyal Soc, London 



(1896). 



2. '• An investigation on the vnriabilitv of the human skeleton." Phil. 



Trans. Poyal Soc, London (1898). 



3. '• An abnoi-mality in Bona tempomria." Anat. Anzeiger (1898). 



4. " An observation on inheritance in parthenogenesis." Proc. Porjal 



Soc, London (1899). 



5. " On the reaction of Daphnia magna (Straus) to certain changes in 



its environment." Quart. Joirrn. Micro. Science (1900). 



6. " A preliminary account of the development of the free-swimming 



Nauplius of Leptodora hijalina Lillj." Proc. Poyal Soc, 

 London (1901). 



7. " On the teeth of Myj'inc and Pet roimizon.''' Quart. Journ. Micro. 



Science (1902), 



8. *' On the anatomy and development of the Fluke, Vistomuin. 



cirrigerum v. Baer." Quart. Journ. Micro. Science (1903). 



9. " Preliminary attempt to ascertain the relationship between the 



size of cell and the size of body in Daplinia magna Straus." 

 Jiionietrila, London, vol. ii, pt. 3 (1903). 



10. " On Jiertraniid hirhnioni sp. n. a Myxosporidium occurring in a 



South African Rotifer." Annah XataJ Museum, vol. i. pt. 1 

 (1906). 



11. '• On Tuhularia solitaria sp. n. a Hydroid from the Natal Coast." 



Annals Xatcd Museum, vol. i, pt. 1 (1906). 



12. " On Hedocordyle cooperi sp. n. a Hydroid from the Natal Coast." 



Anncds Natcd Muscu7n, vol. i, pt. 1 (1906). 



13. " Note on Conroluta roscoffensis Graff collected on the Natal Coast." 



Arneds Xatcd Museum, vol. i, pt. 1 (1906). 



14. " Note on the abnormal hoofs of a Sheep." Anncds Xatal Museum, 



vol. i, pt. 1 (1906). 



15. '' On Parawrightia rohusta sp. n. a Hydroid from the Natal Coast ; 



and also an account of a supposed Schizopl) yte occurring in 

 the gonophores." Anncds Xatal Museum, vol. i, pt. 2 (1907). 



16. '■ Note on the variation in the arrangement of the capitate 



tentacles in the Hydroid Iledocordyle cooperi.'" Annals Xatal 

 Museum, vol. i, pt. 2 (1907). 



17. " Note on the larva of a Fly {Sarcophaga sp.) occurring in the 



Human Intestine." Anncds Xatcd Museum, vol. i (1907). 



18. " On a collection of Hvdroids mostly from the Natal Coast." 



Annals Xatal Museum, vol. i, pt! 3 (1908). 



19. " On Lafcea dispolians sp. n. a Hydroid parasite on Sertnla ria 



hidens Bale." Annals Xatal Museum, vol. ii, pt. 1 (1909). 



20. " Notes on the life-histories of Natal Termites, based on the 



observations of the late Mr. G. D. Haviland." Annals Xatal 

 Museum, vol. ii, pt. 1 (1910). 



