EXPLANATION OF PLATES. 453 
FIGURE. PAGE, 
11-13. Lingula anatina, Lam Moluceas. 11, dorsal ; 12, 
ventral; 13, ventral In fig. 11 a small portion of 
the liver and visceral sheath have been removed, to 
show the course of the stomach and intestine. In 
some specimens the whole of the viscera, except a 
portion of the liver, are concealed by the ovaries. 
In fig. 13 the front half of the ventral mantle-lobe is 
raised, to show the spiral arms; the black spot in 
the centre is the mouth, with its upper and lower 
lips, one fringed, the other plain. The mantle-fringe 
has been omitted in figs. 11, 13. a@ a, anterior 
adductors; a’, posterior adductor; p p, external 
adjusters; p’ p’, central adjusters; + r, anterior 
retractors (the anterior occlusors of Hancock) ; 
r’ rr’, posterior adjusters; c, capsule of pedicle; 
nn, visceral sheath; 0, esophagus; s, stomach; 
l, liver; 7, intestine; v, vent; 6, branchial vessels; 
m’, mantlemargin; m, inner lamina of mantle- 
margin retracted, showing bases of setze; s, sete. . 341 
14. Lingula Murphiana, King. Australia, : ‘ . 341 
