UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 6, No. 4, pp. 65-114, Pis. 7-14 November 15, 1909 



CONTRIBUTIONS PROM THE LABORATORY 



OF THE 



MARINE BIOLOGICAL ASSOCIATION OF SAN DIEGO. 

 XXVI. 



HA LOCYNTH1A JOHNSON1 "n. sp. 



A COMPREHENSIVE INQUIRY AS TO THE EXTENT OF 



LAW AND OEDEB THAT PREVAILS IN A 



SINGLE ANIMAL SPECIES 



BY 



WM. E. RITTER 



CONTENTS. 



PACE 



1. Introductory remarks ii.1 



2. Diagnosis of the species - 67 



3. Some further anatomical . I ■ ■ r .- 1 i 1 s 69 



I Some statistics on variation jr, 



5. To what extent mighl the variation of this animal be reduced to a 



repetitive basis and treated numerically? 78 



6. To what extent are the specific differences between //. johnsoni and 



its neighbor //. haustor adaptive? ss 



7. Summary of Results . 95 



1. Introductory Remarks. 



Earlier English men of science were fund of speaking of 

 their studies as "inquiries". The usage seems to me wholesome. 

 Implying the interrogation point as the word clearly does, it is 

 a good reminder that ascertained truths of nature are always 

 footholds for further advance, quite as well as so much posi- 

 tively gained. 



By "comprehensive" I do not mean that everything con- 

 cerning this species is included in the study. It seemed desira- 

 ble, though, to lei the title indicate that the "inquiry" reaches 

 in several directions. So strong is the tendency of exact biolog- 



