714 RAYMOND PEAKL. 



Uexkull, J. VON. : 00, CI. — "Die Wiikuiig von Liclit iiiui Scliatitii auf die 



Seeigel," ibiil., Bd. xl, p)). 4iG— 470, Taf. i. 

 Vekwokn, M. 'S9. — ' Pbyciiophybiologisclie Proliblcnsludien,' Jena (Fiblier), 



1SS9, pp. viii and 218, Taf. i— vi. 

 WuiTMAN, C. O. '99. — "Animal Behaviour," 'Woods Holl Lectures for 



1898,' pp. 285—338. 



WlLLEY, A., '97. — "On Ileteroplana, a New Genus of Planarians,"' ' Quart. 

 Journ.Micr. Sci.,' N. S., vol. xi, pp. 203-205. 



Wilson, C. B. : 00. — "The Habits and Early Development of Cere- 

 bratulub lacteus (Verrill): a Cuntribution to Piiysiological Mor- 

 ))liology," 'Quart. Journ. Micr. Sci.,' N. S., vol. xliii, pp. 97 — 198, 

 ))ls. ix — xi. 



WoODWOKTU, AV. McM. "91. — "Contributions to Ihc Morphology of tlie 

 Turbellaria : I, On the Structure of Phagocata gracilis, Leidy," 

 'Bull. Mus. Comp. Zool.,' Harvard College, vol. xxi, No. 1, pp. 1 — 42, 

 pis. i — iv. 



WoouwoRTH, W. McM. '97. — " Contributions to the Morphology of the 

 Turbellaria: II, On some Turbellaria from Illinois," ibid., vol. xxxi, 

 pp. 1 — 10, pi. i. 



Yehkes, K. M. : 02. — " A Contribution to the Physiology of the Nervous 

 System of the Medusa Gonionemus Murbachii: Part I, The 

 Sensory Reactions of Gonionemus," ' Amer. Journ. Physiol.,' vol. vi, 

 PI). 434—449. 



Zachakias, O. '88. — " Landplanarien auf Pilzen," 'Biol. Centralb.,' Bd. 

 viii, pp. 542, 543. 



