1918] Packard: Molluscan Fauna from San Francisco Bay 279 
Macoma nasuta (Conrad) 
Plate 23, figures la, 1b, 1c, 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. 307; 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 diated; 
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), D5703 (8), D 5704 (2, 2), 
D 5705 (17), D5706 (16, 2), D 5708 (13, 3), D5709* (8, 37), D 5714 
(GES PAL), ID) Sales (GE AD), Dal. (PA), ID Sials) ())\, IDES (io, O))p 
D 5724 (4), D 5725 (28, 7), D 5726 (28, iy ID) Se (2 ILA Ne Dy sires} 
(3) Dia(291(6.5) Di5730' (43), D 5739) (83), Ds740) (Gy 5), D542 
(5), D 5743 (52, 8), D 5744 (50, 16), D BAS (39), D 5746 (8), D 5748 
(1, 6), D 5749 (f), ID GO (OZ 1), ID Eyl (HO), ID GE! Co, tA 
ID) Byte) (Gr ee re Hi (Ge Da IDE (C4), Dats} (G)),, IDai(ss (G5 TW). 
1D) HG (GF, WA), 1D) HGS (6h Pie IDA (Gi), INSTA (Gy BS). ID aie 
(14), D 5778 ee Di5779) (19), Di5780) (10), DsTsl (5,2). Dist95 
(6), D5796 (3), Dail 8 (14), D5799 (2), Beet Gir Diss0l Tei 
D 5802 (23), D 58038 (24, 12), D 5805 se 5808 (3), D 5811 (7, 1), 
D 5816 (2), D 5819 (14), D 5819 A (2), = ONC) Di5820 RAN Ge 2). 
1D:5821 (2), D 5821 5 ee D 5822 (3), D 5822 A (1, 27), D 5822 B 
(1, 9), D 58238 (39, 2 5823 A (1, 18), ae 3 B (8), D 5824 (14), 
D 5824 A (2), D582 ane (GD, (53), DBE) (zz, 119), 825 A (6, 18), 
D 5825 B (132), D5826 (138), D5826 A (6), D5826 B (1, 100), 
D 5827 (1), D 5827 B (4), D5828 (18), D 5828 A 3), D 5828 B 
(7, 2), D 5829 A (1), D 5830 (2), D5833 B (9, 2), D 5831 (2, 8), 
D 5832 A (7), D5833 (29), D 5834 (7, 40), D 5835 (2, 26), D 5886 
(98), D 5839 (122), D 5841 (25), D 5843 (2), D 5847 (7), D 5847 B 
(94), D 5848 (4), D5849 (112, 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 molluscan fauna. 
It has a general distribution throughout the bay, adapting itself to a 
wide range of environmental conditions. Its distribution pattern ap- 
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