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© 
1918] Packard: Molluscan Fauna from San Francisco Bay 2 
Macoma nasuta (Conrad) 
Plate 23, figures la, 1b, le, and 1d; pl. 49 
Tellina nasuta Conrad (1837), p. 258. 
Macoma nasuta Carpenter (1863), p. 639; Wood and Raymond (1891), p. 
55; Dall (1900b), p. 807; Arnold, R. (1903), p. 163, pl. 16, fig. 3. 
Description.—This species was originally described by Conrad (1837) as 
follows: 
**Shell ovate, compressed, smooth but not polished; anterior side diiated; 
posterior side cuneiform, extremity truncated, much above the line of the base; 
fold carinated on the superior valve; beaks central, slightly prominent; epi- 
dermis extremely thin and deciduous, finely wrinkled, brown; pallial impression 
of the left valve joining the anterior cicatrix at its lower posterior angle.’’ 
Length, 3 to 70 mm. 
Occurrence.—At stations D 5701 (2), D 5703 (8), D 5704 (2, 2), 
D 5705 (17), D5706 (16, 2), D 5708 (13, 3), Dd5709* (8, 37), D 5714 
C2) Disilor GL) DIST16 (2). DsTl9, (6), eWai2a, (40.9). 
D 5724 (4), D 5725 (28, 7), D5726 (28, 10), D 5727 (4, 17), D 5728 
(3), D 5729 (6, 5), D 5730 (4, 3), D 5739 (33), D 5740 (3, 5), D 5742 
(5), D 5743 (52, 8), D 5744 (50, 16), D 5745* (39), D 5746 (8), D 5748 
(Cio). WiDT49o) (£)) 5750) (0) 1), Distal (10), D 5754 (6, 5), 
Wisioo (se, 2), Dist56(6,9), Distal (4); Di5758" (3), D 5763: (35 7), 
DISGL (62 2) D566 (da 2), Dip (or ak Dini, Bh Drone 
(14), D 5778 (7), D5779 (19), D 5780 (10), D 5781 (5, 2), D 5795 
(6), D5796 (3), D5798 (14), D5799 (2), D5800 (3), D 5801 (2), 
D 5802 (23), D 5803 (24, 12), D 5805 (10), D 5808 (3), D 5811 (7, 1), 
D 5816 (2), D 5819 (14), D5819 A (2), D 5820 (2), D 5820 A (2, 2), 
D 5821 (2), D5821 A (2), D 5822 (3), D5822 A (1, 27), D 5822 B 
(1, 9), D 5823 (39, 2), D 5823 A (1, 18), D 5823 B (8), D 5824 (14), 
D 5824 A (2), D 5824 B (12, 63), D 5825 (24, 19), D 5825 A (6, 18), 
D 5825 B (132), D5826 (13), D5826 A (6), D5826 B (1, 100), 
D 5827 (1), D 5827 B (4), D 5828 (18), D5828 A (3, 3), D5828 B 
(1, 2), D5829 A (1), D 5880 (2), D5833 B (9, 2), D 5881 (2, 8), 
D 5832 A (7), D 5833 (29), D5834 (1, 40), D 5835 (2, 26), D 5836 
(98), D 5839 (122), D 5841 (25), D 58438 (2), D 5847 (7), D 5847 B 
(94), D 5848 (4), D5849 (172, 15), Standard Oil Pier, Richmond 
(3), Key Route Pier, Oakland (4, 1), MeNeer’s Landing (9), Sausa- 
lito (1), and questionably at D 5773, D 5786, D 5788. 
This is one of the most common species of the mollusean fauna. 
It has a general distribution throughout the bay, adapting itself to a 
wide range of environmental conditions. Its distribution pattern ap- 
