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Tlie Anatomy of Lucapina crenulata G-ray. 



By 

 J. F. lUingworth. 



With plates 31 — 33 and 15 figures in text. 



The present work was begun at the Leland Stanford Jr. Uni- 

 versity in September of 1900, and carried on with other studies through 

 the following two semesters. A part of the time, spent at the Hop- 

 kins Seaside Laboratory, gave an excellent opportunity for the study 

 of the living animals. This Laboratory is situated on the Monterey 

 Bay at Pacific Grove, about one hundred and twenty miles south of 

 San Francisco. The character of the coast at this place is most 

 favorable for a marine laboratory. It is of a coarse granite formation, 

 presenting many rocky points, with small inlets and tide pools between 

 them, whose sheltered waters abound in living forms, both plant and 

 animal. It was here that the material described in the following 

 pages was collected. 



I take this opportunity to express my appreciation to the Directors 

 of the Hopkins Laboratory, Professors 0. P. Jenkins and C. H. Gil- 

 beet, for the privileges of the Laboratory, which were so freely ex- 

 tended to me. Especially am I indebted to Dr. Harold Heath, both 

 for pointing out this problem to me, and for the counsel and kindly 

 assistance that he offered me at all times. 



Methods. Lucapina is found in sheltered places along the 

 coast from Monterey to San Diego usually where the seaweed grows 

 abundantly. These animals are seldom found above low-water mark, 

 but live usually just below this limit, often extending out to depths 

 of fifteen or twenty feet. They are pulled off the bottom by means 

 of a long pole with a blunt hook on the end which is pushed under 

 the edge of the mantle. 



