CONTENTS OF VOL. XI. 



No i. JUNE, 1906. PA(I| , 



IXKX L. WHIPPLE : The Naso-labial Groove of Lungless Salamanders. \ 

 E. D. CONGDON : Notes on the Morphology and Development of Tu<o 



Spfdes of Eitdend Hit in 27 



Wr.si, KY R. COE : A Peculiar Type of Nephridia in Nemerteans 47 



No. 2. JULY, 1906. 



T. BRAILSFORD ROBERTSON : On the Influence of Electrolytes upon the 

 Rate of Rhvt/un/c Muscular Contractions. (Prcliminarv Com- 

 munication*) 53 



FERNANDUS PAYNE : Tlie Eyes of the Hlind ]~ertel>raics of XortJi 

 America. VII. The Eves of Amphioba-na punctata (>e//), a 

 Blind Lizard from Cuba 60 ^ 



T. H . MORGAN : Experiments wif/i frog 1 s Eggs 71 



A. M. REESE: Observations on the Reactions of Cryptobranchus and 



Necturus to Light and Heat 93 ' 



W. M. SMALLWOOD : Notes on Bran'chiolniella 100 



No. 3. AUGUST, 1906. 



C. M. CHILD: The Relation H etwee n Regulation and fission in Plan- 

 aria 113 



T. H. MORGAN : The Origin of the Organ-forming Materials in the 



Frog 1 s Embrvo 124 



A. P. MATHEWS : A Note on the Susceptibility of Segmenting Arbacia 



and Asterias Eggs to Cyanides 137 



A. P. MATHEWS: A Note on the Struct it re of the Living Protoplasm of 



Echinoderm Eggs 141 ^ 



BERTRAM G. SMITH : Preliminary Report on the Embryology of Cryp- 

 tobranchus Alleglieniensis 146 ^ 



No. 4. SEPTEMBER, 1906. 

 C. M. CHILD: Some Considerations Regarding so-called Formative Sub 



stances 1(5 



FRANK M. SURFACE: The Formation of Avrc Colonies of the Rotifer, 



Megalotrocha albojlavicans, Ehr i S 2 



Kvis H . BERRY : The ' ' Accessory CJiromosome ' ' /// Epeira 193 



iii 



