OPISTHOBRANCHIATE MOLLUSCA FROM MONTEREY BAY, CALIFORNIA, AND 

 VICINITY, 



By F. M. MacFARLAND. 

 Associate Professor of Histology, Lclami Stanford funior University. 



This paper does not purport to be a complete list of the Doridoidea found in 

 Monterey Bay and vicinity, but probabl}' includes all of the commoner forms there 

 represented. It is based upon collections made at various intervals since 1892, 

 mostly in the immediate vicinity of Pacitic Grove, Cal., and much of the manuscript 

 has been for several years in practically the form here presented. It was not 

 deemed desirable, however, to publish the descriptions of some of the i-arer forms 

 until the acquisition of further specimens had made possible more extended morpho- 

 log^ical study. Several species which now are represented by but a single individual 

 in the collection are withheld for the present. 



This study was conducted at the Hopkins Seaside Laboratory," which is situated 

 on the southernmost shore of ^bintin-ey Bay, ubnut Il'h luilcs south of San Francisco. 

 Tlie entrance to the bay i-. uliout I'n iiiilr> broad, and it^ noitlicrn and eastern shores 

 present an almost continuous >;ui(ly licach, luokcii at long intervals by short rocky 

 stretches; but on the south, from Monterey onward, the shore line is nmch more 

 diversified, granitic cliifs rising to 4:0 or 50 feet above the sea and offering every 

 variety of rocky com- and siieltered sand beaches, with a wealth of littoral animal 

 and plant life. Foini I'ino- forms the southern headland of the bay, but the general 

 character of the coa-^t continues the same for several miles southward. Beyond 

 Cypress Point opens another and much smaller bay, Carmelo Bay, at the mouth 

 of the Carmel River, with the rugged and precipitous Point Lobos at its southern 

 boundary. The most of the forms herein described were collected along the southern 

 shore of Monterey Bay and the neighboring coast line as far south as Point Lobos 

 and are mainly from the tidal zone, though some dredging has been done also. 



The general systematic arrangement of the group here followed is modified from 

 that of Prof. R. Bergh as given in his System der Nudibranchiaten Gasteropoden 

 (Wiesbaden, 1892). For the convenience of other students of the group on the Pacific 



o My sincerest thanks are due to the directors of the Hopkins Seaside Laboratory, Professors Jenkins and Giliiert, for 

 the facilities afforded me by that institution and for their unfailing kindly interest and encouragement in my work. The 

 generous cooperation of Mr. Timothy Hopkins, of San Francisco, made possible the illustration of many of the species 

 represented in this paper. I am indebted to the Smithsonian Institution for the assignment of a table in the Naples 

 Zoological Station during the winter of 1902-3, where I had the valuable opportunity of studying and comparing many of 

 the Mediterranean forms with these of the California coast. My grateful acknowledgments are due likewise to Professor 

 Dohrn and his able staff. 



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