1918] = Packard: Molluscan Fauna from San Francisco Bay 277 
stations both within and west of the Golden Gate. Living specimens 
were obtained at ten stations at depths of 614 to 17 fathoms, on bot- 
toms that are predominantly sandy. The largest number of specimens 
were obtained at D 5731 at a depth of 16 fathoms and on a bottom of 
sand and gravel. 
Range—Kodiak Island, Alaska, to San Pedro, California. 
Macoma Leach 
Macoma balthica (Linnaeus) 
Plate 25, figures 1, 2, and 9; pl. 47 
Tellina balthica Linnaeus (1758), p. 677. 
Macoma inconspicua Broderip and Sowerby, Carpenter (1863), p. 639; 
Wood and Raymond (1891), p. 55. 
Description.—Professor Clark translates the original description as follows: 
‘‘Shell of the size of the seed of the white lupine, somewhat delicate, very 
fragile, interior white, exterior flesh colored, of a rounded triangular shape.’’ 
Length, 3 to 35 mm. 
Occurrence.—At stations D 5704 (1), D 5705 (10, 2), D 5706 (2), 
D 5710 (1), D 5715 (2), D 5716 (10), D 5717 (21), D 5719 (1), D 5720 
(15), D 5729 (1, 1), D 5730 (6, 4), D5739 (3), D5740 (1), D 5743 
(39), D 5749 (6, 7), D5750 (1, 2), D 5751 (7), D 5754 (13), D 5756 
(2, 1), D5757 (7), D5758 (48), D 5764 (2), D5771 (7, 2), D 5780 
(42, 30), D5781 (2), D5782 (9), D5793 (27, 3), D5794 (4, 6), 
D 5800 (4, 2), D5802 (1), D5810 (5), D5811 (1, 8), D5815 (1), 
D 5815 A (1), D 5816 (12), D 5816 B (2, 2), D5818 A (8), D5818 B 
(14), D 5819 (1, 5), D5819 A (3, 2), D5820 A (2), D 5820 B (9), 
D 5821, D5825 A (1), D5827 A (1), D5830 B (5), D 5833 (128), 
Key Route Pier, Oakland (9, 4), and questionably at D 5744, D 5748, 
D 5762, D 5763, D 5821, D 5828 A, D 5831. 
This prevalent species was taken by the Survey only within San 
Francisco Bay. It is very abundant in the middle division of the 
bay and was occasionally taken in the upper bay even in the freshened 
waters of Carquinez Strait. 
Range.—Cireumpolar, south to San Diego, California (Dall). 
Macoma indentata Carpenter 
Plate 25, figure 4 
Macoma indentata Carpenter (1863), p. 639; Arnold, R. (1903), p. 161, 
pl. 16, fig. 1. 
Description—Arnold (1903) described this species as follows: 
‘*Shell of medium size, rather narrow, suboval, compressed, thin; umbones 
slightly posterior to center; anterior end long and evenly rounded; posterior 
