32 
Haliotis, Crepidula and others, while the ribbon kelp attached to the 
rocks carries several species that find shelter among its leaves. 
The “ marine ways,’’ too, contribute their share of treasures, some of 
which, however, are introduced, as many small schooners from the south- 
ern coast come here to have the grass, barnacles and other foreign matter 
scraped off their hulls. ‘This material furnishes a shelter for small mol- 
lusks, some of which are found among the debris. 
Probably the most interesting method of collecting, and without 
doubt the one most costly, both in money and in labor, is securing the 
shells by means of the dredge and trawl. Both Dr. Fred Baker and 
I have done a great deal of this during the past five years, and have 
quite thoroughly covered an area of about thirty square miles of water, 
in the form of a semi-circle, with the entrance to San Diego harbor as a 
center. 
The area so covered ranges from five to seventy fathoms in depth, and 
the species obtained have been quite numerous, including several new 
ones, and many others quite rare. 
Personally I have dredged, with a good deal of care, all portions of 
the bay having over three fathoms of water, and have obtained very satis- 
factory results. 
In the following list, which contains 554 species and named varieties, 
over 500 are at the present time in the author’s collection, while the 
remainder are in the collections of Dr. Fred Baker, the Marine Biological 
Association of San Diego, and the National Museum at Washington, or 
are listed from C. R. Orcutt’s list, published in the Proceedings of the 
National Museum in 1885; Philip P. Carpenter's list, published in 1872, 
and various publications mentioned in the explanatory notes. 
The author has received the valuable assistance of Dr. William Healey 
Dall, Dr. Paul Bartsch and Dr. Fred Baker, in the identification of species. 
The Nudibranchs are taken from a list prepared by Professor Mac- 
Farland, of Stanford University. 
The list has been arranged alphabetically for ready reference, but for 
further convenience an index of genera and sub-genera has been provided, 
the same being arranged in the order adopted by Tryon in his Structural 
and Systematic Conchology. 
Acanthochites avicula, 
Watemdiegoensis-scessseer 
Aicmaear as mil. .crabasene ons caeae seeeeeeeeee 
depictameeene sss Meter 
Found on eel grass in sheltered localities. 
PINCESS Alrsin: se sete Poislewia. Gena anys be Cee Reet SCRE eR Br Pade si5 ne Soe Hds. 
FOG Ks} 21) NU DS ean ee Lea ra west Sp a Benue sincoce cococe Gld. 
