1918] Packard: Molluscan Fauna from San Francisco Bay 251 
OSTRACEA 
OSTREIDAE 
Ostrea Linnaeus 
Ostrea lurida Carpenter 
Plate 14, figures 10a and 10b, and plate 42 
Ostrea lurida Carpenter (1863), p. 645; Carpenter (1865c), p. 137; Wood 
and Raymond (1891), p. 55; Dall (1898c), p. 687; Arnold, R. (1903), 
p- 102. 
Ostrea lurida var. laticaudata Nuttall, Carpenter (1863), p. 646. 
Description.—Arnold’s (1903) description of this variable species is as 
follows: 
‘Shell of medium size, irregular, suborbicular, ellipsoidal, or elongated; 
surface laminated and sometimes irregularly plaited; beak prominent; hinge 
toothless. ’’ 
Length, 3 to 60 mm. 
Occurrence.—At stations D 5700 (4), D 5701 a Di5702* (6), 
Dip all (2). Distil2: C0); D573 4), D sma (3), DisT25 oy D 5727 
(®), IDBIO (GD)5 ID EGE TCD RI Dea) Darel a D 5742 (3), 
D 5744 (1), D5754 (6), D5755 (15), D 5764 (6, 13), D 5766 (30), 
“D 5767 (4, 24), D5768 (208, oo); IDS) (GD), ID Sie) (GD), IDYajctcHl 
(18, 22), D578 2 (17, 19), D 5783 (12, 8), D 5784 (20, 44), D 5792 
@), D'5793 (2), D 5794 (7), 5795 ©), D 5796 (10), D 5800 (7), 
D 5801 (3), D5802 (1), D5805 (1), D5808 (2), D5810 (77, 50), 
D 5811 (116), D 5812 ee 7,51), D 5813 (41, 70), D 5814 (60), D 5821 B 
(1), D 5824 B (6), Boe B (2), D5826 A (f), D5826 B (large 
numbers), D 5827 ee D582 A (2) sD 5127 1B); Di5829) (a). 
D 5829 A (21), D5832 (large numbers), D 5833 (large numbers), 
D 5835 (large numbers), D 5836 (2), D 5839 (2), D 5841 (several), 
D 5843 (1), D5846 (1), D 5847 (500), D5848 (200), D5849 (4), 
Standard Oil Pier, Richmond (4), Red Rock (6, 11), Sausalito (1), 
and questionably at D 5729, D 5731, D 5746, D 5773, D 5798, D 5799, 
D 5809. 
This native oyster has been reported by various writers under 
several varietal names from the vicinity of San Francisco. It is a 
hardy species, having a general distribution within the bay besides 
occurring in the shallower waters outside the Golden Gate. It is 
apparently restricted by the distribution of a type of bottom that 
affords a suitable support for the young. The relatively small number 
of localities at which shells were obtained is due largely to the fact 
