Fig. 
Fig. 
~ la, 
14, 
le, 
2a, 
26, 
TAB. I. 
Balanus tintinnabulum, nat. size; small specimen. 
os rostrum, internal view of, large specimen, nat. size. 
4 scutum and tergum, internal views of, from recent spe- 
cimens, the opercular valves not having been found 
fossil. 
Balanus calceolus, engraved from a recent specimen, the single fossil having been 
ae 
3? 
injured during examination. 
scutum and tergum, internal views. 
2d, Spur of tergum, variety: all from recent specimens, the opercular valves not 
having been found fossil. 
3a, 36, Balanus spongicola, scutum and tergum, external views. 
3¢, 
3e, 
. Aa, 
Ab, 
Ac, 
Ad, 
Ae, 
Af, 
49, 
Ah, 
At, 
Ak, 
AT, 
Am, 
AN, 
Ao, 
Ap, 
3d, 
2) 
Py S is internal views. 
shell, enlarged from a recent specimen, the single fossil 
being young, and having been injured by examination. 
33 
Balanus concavus, shell (Coralline Crag specimen). 
3? 
23 
22 
internal view of part of the carina (to the left hand), of the ca- 
rino-lateral compartment, and of part of the lateral compart- 
ment, showing the raised borders (7) on the rostral sides of 
the sutures in the sheath (Italian Tertiary specimen). 
shell, var., with longitudinal ridges or ribs not prominent 
(Coralline Crag). 
smooth var. (Piedmont specimen). 
scutum, external view (Coralline Crag). 
» Internal view do. 
tergum, external view do. 
scutum, internal view (Maryland, U.S.). 
tergum, internal view do. 
» external view do. 
scutum, external view (Portugal fossil, and recent). 
tergum, external view do. do 
scutum, internal view do. do. 
tergum, external view, very large specimen (Turin). 
scutum, small portion, at the rostral corner, highly magnified, 
very large specimen (Turin). 
Fig. 5a, Balanus porcatus, shell, nat. size (Red Crag). 
