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. 187; Wood 
and Raymond (1891), p. 55; Dall (1898¢), 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), D5701 (2), ae Se 
D 5711 (2), D 5712 (10), D 5718 (14), D 5714 (8), D 5725 (8 
(3), ID BGO) (GD IDBEP) (aD); ID SEM aAD)s ID EVENT (als 1Dys 
D 5744 (1), D5754 (6), D5755 (15), D 5764 (6, 13), D 5766 (30), 
D 5767 (4, 24), D5768 (208, 35), D5779 (1), D5780 (1), D5781 
(18, 22), D 5782 (17, 19), D 5788 (12, 8), D 5784 (20, 44), D 5792 
(2), D 5798 (2), D5794 (7), D5795 (9), D5796 (10), D 5800 (7), 
D 5801 (3), D5802 (1), D5805 (1), D5808 (2), D5810 (77, 50), 
D 5811 (116), D 5812 (57, 51), D 5818 (41, 70), D 5814 (60), D 5821 B 
(1), D 5824 B (6), D 5825 (2), D5826 A (f), D5826 B (large 
numbers), D 5827 (2), D5827 A (2), D5727 B (1), D5829 (1), 
D 5829 A (21), D 5832 (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), D 5849 (4), 
Standard Oil Pier, Richmond (4), Red Rock (6, 11), Sausalito (1), 
and questionably at D 5729, D 5731, D 5746, D 5778, 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 
