170 MOLLUSCA. 
rug; colour bright ochreous, deep sea-green above, with radiating 
ramifications of darker green, lighter than elsewhere at the margin. 
Muzzle beneath sienna-brown, above mottled with yellow. Ocular 
pedicles with a whitish triangular appendage at their inner base, the 
margin incised so as to form five small lobes; they seem capable of 
moderate dilatation and contraction. ‘Tentacles long and slender, dark 
brown, annulated with faint blackish limes. From the base of the 
tentacles arises a lateral veil, extending nearly to the operele, bearing 
on each side a single filamentary appendage. ‘The branchie are very 
large, ensiform, double, their extremities projecting to the left beyond 
the mantle. Mantle projecting slightly beyond the shell, of a lhght 
umber colour. The lateral veil, or fringe, is clouded pale yellow and 
white, broadest anteriorly, having a fissure at its anterior third, and 
with its free edge finely incised. 
The motions of the animal are rapid, but it is very cautious, and 
often remains half a day with the tentacles slightly protruded, with- 
drawing on the slightest disturbance. Found abundantly at Clermont 
onnere.» [is4Psc:)] 
Figure 198, shell, with the animal, as in motion; 198 a, locomotive 
disk; 198 4, head and tentacles in outline; 198c, tentacle and leaflet, 
enlarged. 
Turso arcyrostomus (Lin.), Syst. Nat., ed. 12, 1236. DEsHayEs, 
in Lam., An. sans Vert., ix. 188. 
Animat beneath ochreous; above clouded with saffron-yellow ; ten- 
tacles ferruginous; auricles of the eye pedicles diamond-shaped, very 
numerously and delicately crenulate ; head flabellate; lateral cirrhi 
two (?) on each side. 
Figure 199, the animal as in motion; 199 a, the head and tentacles 
in outline; 199 4, the eye with its leaflet, enlarged. 
Turbo SPARVERIUS (GMELIN), Lamarck, An. sans Vert., ix. 220. 
Cuemn., Conch., v. 204, pl. 181, f. 1798. 

