— 248 — 
PETRICOLA ROBUSTA SOWerby 
4834. Petricola robusta 
1851. —  bulbosa 
1854. —  robusta 
1855-57. — —  Sow., 
1857. -—  bulbosa 
1874. —  robusta 
SOWERBY, P. Z. S. L., p. 47. 
GouLp, Proc. Boston Soc. Nat. Hist., 
IV, p. 88. 
SowerBy, Thes. Conch., Il, p. 77%, 
pl. CLXVI, fig. 16-17. 
CARPENTER, Cat. Mazatlan, p. 17. 
GouLp, Journ. Nat. Hist. Soc. Boston, 
VI; p: 389 pl.XV; fig5; 
SOWERBY, in Reeve, Conch. Ic., XIX, 
Petricola, pl. II, fig. 20 a-b. 
Golfe de Californie : cap Pulmo. 
SAXICAVA ARCTICA Linné 
4767. Mya arclica 
4855-57. Saxicara — L., 
1879. _ —  — 
1887. — —  — 
Golfe de Californie. 
LiNNE, Syst. Nat., éd. XII, t. I, p. 1143. 
CarPenTER, Cat. Mazatlan, p. 16. 
SowErRBy, 1 Reeve, Conch. Ic., XX, 
Saxicava, pl. I, fig. 1. 
SoweRrBy, Thes. Conch., V, p.132, pl. 471, 
fig. 1. 
MacrRA (MACTRELLA) EXOLETA Gray 
1837. Mactra exoleta 
1851. Lutraria tentricosa 
1854. Mactra exolela Gr., 
1855-57. — — — 
1856. — == 22 
1894, M. (Mactrella) — — 
Gray, Mag. Nat. Hist.,n. ser., I, p. 372. 
Goui.»b, Proc. Boston Soc. Nat. Hist., p.89. 
Reeve, Conch. Ic., VIII, Mactra, pl. IV, 
fig. 16. : 
CARPENTER, Cat. Mazatlan, p. 50. 
CarPenrTer, Rep. Moll. W. Coast N. Ame: 
rica, pp. 227, 232, 246, 280. 
Dar, Synops. Mactridæ, Nautilus, VIII, 
p. 40. 
Puerto Angel, Elat d'Oaxaca. 
