10235 LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF THE PLATES. 
f. brachial fold; ¢. tentacle; b.t. bases of tentacles ; 
n. nerve; ep. epithelium; s.ep. sub-epithelial tissue ; 
c.m. brachial canal containing muscle; @. cesophagus ; 
d.s. dorsal shell; v.s. ventral shell; p.c. pallial chamber ; 
lm. mantle lobes; ww.v.c. wall of visceral chamber; o.m. 
oblique muscle; m. muscle in canal; m.s. mesentery ; 
x.,v.r, modified epithelium; P. posterior; A. anterior. 
PLATE IIT. 
Fig. 1. Transverse section of Lingula anatina, along line 
a...b. of Pl. IV., fig. 4, half shown. 
. Transverse section of the arm of Lingula anatina. 
. Transverse section of the arm of Crania anomala. 
a 
ae, 
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PEATE AY: 
Fig. 1. Longitudinal section of Crania anomala, along lines 
Peet Ol Honea and oF 
Fig. 2. Crania. Pallial chamber showing arm (half drawn), 
dorsal mantle lobe removed. 
Fig. 3. Crania. Pallial chamber showing arm (half drawn), 
ventral mantle lobe removed. 
Fig. 4. Lingula. Pallial chamber, ventral mantle lobe 
reflexed. 
Fig. 5. Crama. Pl. IIL, fig. 3, x. enlarged. 
PATER? 
. Lingula. Pi. IIL., fig. 2, x. enlarged. 
slimguidas Lelio sie oo enlarocds 
. Lingula. Pl. IIL., fig. 2, xz. enlarged. 
Crama.. Pl. III., fig. 3, #.z. enlarged. 
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