364 LITTORINID A&A. 
R. Reticutata, Montagu. 
R. Beanii, nonnull. et Brit. Moll. iit. p. 84, pl. 79. f. 5, 6. 
R. sculpta, nonnull. et Brit. Moll. iii. p. 88, pl. 80. f. 5, 6. 
The animal occupies a spiral, cancellated, pale yellow or 
brown shell, of 5-6 tumid volutions; its ground colour is 
yellowish-white. Mantle even with the shell, except the fila- 
mentary process at the angle of the aperture. Head pro- 
boscidiform, furnished with the usual cloven disk and buccal 
appendages ; the rostrum near its termination at the upper 
surface appears to have attached to it two very small similar 
shields, one on each side, independent of the terminal minute 
subcircular flat lobes. The tentacula are compressed, slender, 
rather long, rounded at the extremities, not setose: the eyes 
are at the external angles, on short light yellow or orange 
pedicles. Foot subrotund, scarcely auricled, but grooved in 
front sufficiently to form a shallow labium, slightly constricted 
anteriorly at one-third the length, gently tapering to a rather 
obtuse lanceolate but not emarginate termination. The oper- 
culum is carried on an upper, plain, moderately alated lobe, at 
nearly the point of the junction of the foot with the body ; it 
is pyriform, with indistinct rapidly-increasing paucispiral gyra- 
tions ; the terminal part of the lobe, like the R. semistriata, is 
furnished with three blunt, cylindrical, short cirrhi, and occa- 
sionally one of the sides of the main foot is emarginate. The 
branchial plume is composed of 12-15 single, pale yellow, 
short strands, which are visible when the neck is greatly ex- 
serted. The animal is active and freely shows its points. 
Common in the coralline zone, but rather rare alive. 
This is the true Turbo reticulatus of Montagu ; it is, however, 
subject to considerable variation of the contour and quality of 
the cancellations, which have led to the fabrication of some 
spurious species. 
This species has not before been described. The specific 
appellation of ‘reticulata’ must be substituted for ‘ Beanii’; 
—a complimentary term ought not to take the place of the 
long-accredited and not doubtful one of the admirable Mon- 
tagu. 
