RISSOA. 357 
R. discrepans, Brown, mentioned in the ‘ British Mollusca,’ 
vol. iii. p. 101, the first figured pl. 82. f. 8, and the latter, 
pl. 76. f. 2. are mere varieties of this most polymorphous 
species. 
We take this opportunity to remark, that there are a 
number of minute apocryphal objects, termed Turbo and 
Hehx, &e., recorded by Montagu, Turton, Adams, Walker, 
and Brown, which, from the wretched figures and meagre 
descriptions, defy definition and identification. They are 
probably the pulli of other species, and may with equal pro- 
priety be consigned to ten as to one parent. They are only 
alluded to in the ‘ British Mollusca,’ for future possible refer- 
ence; it would be lost labour to notice them farther, and 
we trust that the time is passed for the infliction of such 
descriptions and delineations of objects of natural history. 
R. ruterpa, Adams. 
R. fulgida, Brit. Moll. ii. p. 128, pl. 81. f. 1, 2, and p. 169. 
Animal inhabiting the most minute of the British ris- 
soidean shells, of four tumid volutions, marked on the basal 
and antepenultimate ones with two dull red-brown and two 
light yellow bands, arranged alternately. Aperture nearly 
orbicular ; outer edge thin, without a callous pad, and with a 
subperforated columella; axis ~,th, diameter th of an 
inch. Mantle yellow, even with the aperture, and without the 
pendant filament at the upper angle. Rostrum short, not 
corrugated, flat at the extremity, vertically cloven above and 
below ; disk pale yellow, with a fine dirty-brown line marking 
the fissure. The usual buccal apparatus can be seen in 
action. Tentacula moderately long, strong, divergent, rounded 
at the ends, and under high powers slightly setose; they are 
not much vibrated on the march, of a pale yellowish-white 
hue; eyes large, at their external bases, on slight protruding 
inflations. Foot not very short, nor proportionately so narrow 
as in the typical Réssoe ; rounded in front, slightly labiated, 
and constricted anteally, but not auricled; also rounded 
behind, having a medial longitudinal line on the posterior 
half; colour above yellowish-white; below, confused flake- 
