252 University of California Publications in Zoology [| Vou. 14 
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that the operations of the ‘‘Albatross’’ were confined to the deeper 
region of the bay. Living specimens were dredged in depths ranging 
from less than 1 to 4 fathoms. Shells were encountered frequently 
within the Golden Gate in 19 fathoms. The shells being light are 
quite easily shifted by the currents from the shallow waters to regions 
of deeper water, thereby accounting in part for great numbers of dead 
specimens dredged at certain localities. 
This species is associated with Ostrea elongata (O. virginica), which 
has been introduced from the East. The western species possesses a 
much thinner shell than does the eastern form. The denticulate hinge- 
margin and the more elongate adductor muscle scar also serve to dis- 
tinguish O. lurida. 
It is used quite extensively as food for man, being harvested in 
the lower portion of the bay by several oyster companies. 
Range.—Sitka, Alaska, to Cape Lucas, Lower California (Dall). 
Ostrea elongata Solander 
Plate 15, figures 3a and 3b 
Ostrea elongata Solander (1786), p. 151; Dall (1914a), p. 1. 
Ostrea virginica Gmelin, Gould (1841), p. 137. 
Description—This oyster was described by Gould (1841) in the following 
words: 
“«Shell narrow, elongated, gradually widening, moderately curved, for the 
most part with a long and pointed beak at the apex, and rounded at the other 
extremity. Upper valve, the smallest, flattest and smoothest surface; when not 
worn, presenting everywhere leaf-like scales, of a somewhat leaden color. The 
hinge presents the usual channel in the beak of the lower valve, longer or 
shorter according to the age of the shell, and marked with lines exhibiting 
the successive removes of the cartilage; and in the upper valve we have the 
corresponding elevation, which is also continued back to the point of the shell. 
The muscular impression is nearly central, of a dark chestnut, or sometimes 
dark violet color.’’ 
Length, 10 to 100 mm. 
Occurrence.—At stations D 5781 (11, 15), D 5782 (5, 23), D 5808 
(1), D 5810 (1), D 5811 (9), D 5812 (10), D 5814 (2, 6). 
This is the eastern edible oyster which is grown here from seed 
oysters shipped from the East. This species does not reproduce to any 
extent in these waters. 
Range.—Known on the Pacifie Coast from San Francisco Bay and 
Puget Sound, where it has been introduced. 
