GASTEROPODA. 163 
Bonite, pl. 35, f. 43, though the animal is there given as plain blue- 
black above. 
NERITINA GAGATES (DEsHayEs), Encyc. Meth. Vers, iil. 624. La- 
maARcK; Anim. sans Vert., viii. 570. Sowrersy; Conch. IIL, f. 29. 
Animat lemon-coloured above, beautifully lineate, with four or five 
alternate lines of yellow and dusky ; foot large, slate-coloured, dotted 
at the margin; mantle slate-coloured; tentacles long, eye pedicles 
pale. 
Figure 183, shell, with the animal, as in motion. 
NERITINA UNDATA (DesnayeEs), in Lamarck, An. sans Vert., vill. 
594. Clithon undatus, Lesson; Voy. de la Cogq., 11. pl. 13, f.13. Neritina 
spinosa, SowERBy ; Conch. IIl., f. 9. 
Animat large, yellowish-olive above, margined with a dark line and 
a submarginal fringe of short, crowded, black lines perpendicular to 
the margin; disk of the foot slaty-olive ; head paler, orange at the lips; 
tentacles long, dark-olive ; eye pedicles well developed, white. 
Figure 193, shell, with the animal, as in motion. 
NerItTiNa CorNEA (Lin.), N. ampullaria, Lesson ; Voy. de la Cogq., ii. 
pl. 16, f.1. NN. zebra, and N. dubia, Cuem., &c. 
Animat large, above mottled with green, black, yellow, and fawn- 
colour in broken lines; beneath cream-coloured; mouth green, lips 
flesh-coloured; mantle fawn-coloured ; tentacles long and stout, sea- 
green annulated with black ; eyes black, on short, broad pedicles. 
This very large specimen of a most variable species was found at 
the Feejee Islands. The lip is conspicuously toothed through nearly 
its whole length. The columellar region is very smooth and a little 
concave. The posterior angle of the aperture is deeply channeled, 
perhaps from erosion or distortion. 
