, 
From the Proceedings of the California Academy of Sciences, February 7, 1876. 
Remarks on the Crustacea of the Pacific Coast, with de- 
scriptions of some New Species. 
BY W,. N. LOCKINGTON. 
Notwithstanding the small number of sheltered bays and coves to be found 
along the shores of the Pacific Ocean, south of Vancouver’s Island, the 
Crustacea appear to be tolerably abundant, since the total number of species 
of the two highest orders, (the stalk-eyed and sessile-eyed) known or de- 
scribed up to this date, is about two hundred and twenty, and there is every 
reason to believe that a more searching investigs ation would at least double 
that number. 
Neither Dana nor Stimpson did much work at the Crustacea south of San 
Francisco, and the species lately described by Smith are almost entirely from 
Panama. Between Panama and San Francisco lies a vast extent of coast, 
extending through nearly twenty-nine degrees of latitude, and embracing a 
region greatly diversified in climate and productions, so that although many 
San Franciscan species extend southward a considerable distance, and many 
Panama species may range along Central America, it is but reasonable to 
suppose that many undescribed forms have their limits, between those 
extremes. 
The reasonableness of this expectation will be rendered the more apparent 
by a glance at a map showing the ocean temperature. That portion of the 
ocean bathing the shores of California at San Francisco, belongs to the sub- 
temperate oceanic zone included between the isothermal lines of 50° Faht. and 
56° lowest cold, but the heat of the ocean increases rapidly as we travel south. 
ward, so that the coast from Monterey to San Diego, and for some distance 
south of the latter place, lies between the isothermal line of 56° extreme cold 
and that of 62°. ‘The greater part of Lower California, with the Gulf, is in- 
cluded within the line of 62° extreme cold and that of 68°, and may be called 
warm temperate. From Cape St. Lucas to about the latitude of Acapulco is 
the sub-torrid zone, the isothermal line of 74° degrees lowest cold bounding 
it toward the south, and forming the northern limit of the torrid oceanic zone 
which extends to, or near to, Guayaquil, in the State of Ecuador. 
Since Panama is situated close to the oceanic heat equator, it will be seen 
that in the 29° of latitude between San Francisco and that place there isa 
variation of about 30° in the lowest temperature of the ocean, a difference 
which must and does imply a corresponding variation in the animal life in. 
habiting the ocean. 
It was, therefore, with great pleasure that I received, since our last meeting, 
a small but choice collection of Crustacea, collected at Monterey and San 
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