UNIVERSITY OF CALIFORNIA PUBLICATIONS 



ZOOLOGY 



Vol. 6, No. 7, pp. 145-176 April 6. 1910 



CONTRIBUTIONS FROM THE LABORATORY 



OP THE 



MARINE BIOLOGICAL ASSOCIATION OF SAN DIEGO. 

 XXVIII. 



A QUANTITATIVE STUDY OF THE 



DEVELOPMENT OF THE SALPA 



CHAIN IN SALPA FUSIF0RM1S- 



RUNCINATA* 



MYRTLE ELIZABETH JOHNSON 

 'Research Assistant in Zoology, San Diego Marine Biologieal Laboratory. 



CONTENTS 



PAGE 



1. Introduction 146 



■2. The Material 147 



3. Morphological Observations 149 



4. Quantitative Observations and Data 156 



5. Sal pa sonaria-cordiformis 161 



6. Salpa eylindrica 163 



7. Discussion of Results 166 



8. Graphs as Species Characters 171 



9. Equisetum robustum 171 



10. Irregularities in the Series 172 



11. General Summary 173 



* A thesis submitted in partial satisfaction of the requirements for the 

 degree of Master of Science in the University of California. 



