49 
i. Lingula. 
1. L. Audebardii, t. 345. f. 1, 2. 
2. L. anatina (fig. 33). 
Fig. 33 . — Lingula anatina. 
a a , anterior adductors, a, posterior adductors, p p, external protract- 
ors. p'p central protractors, rr, anterior retractors, r'r'r', 
posterior retractors, c, capsule of pedicel, nn, visceral sheath. 
o, cesophagus. s, stomach. /, liver, i, intestine, v, vent, h h, 
auricles, h', left ventricle, b , branchial vessels, mf, mantle edge. 
m, inner lamina of the mantle margin retracted, showing the bases 
of setae, s , setae. — Hancock. 
