Royal Microscopical Society. 
49 
Bisella (?), Nos. 36, 37, and 38. Rissoa (?). — Hab., low water, 
on seaweed on rocks ; only found on one occasion. They may be 
merely varieties, but I found the following distinctions : — No. 36, 
brown, lip toothed, pink inside. No. 37, larger than Nos. 36 and 
38, brown marked, lip toothed, purple inside. No. 38, smooth 
lip ; thin, semitransparent, showing brown markings through. 
Palates, 1.1.1, very similar, but I think the figures sufficiently 
indicate, in conjunction with the shells, a difference of species. 
Median crescentic ; laterals with two denticulations. In No. 36 
the base is much dilated ; in No. 37, less so, and brought almost 
to a point at the back ; and in No. 38, slightly dilated and more 
like No. 36. Specimens of Nos. 36 and 37 in cabinet of E. M. S. 
Neritid.®. Nerita, No. 14. — Hab., crevices of rocks near 
low water ; rare ; dark bluish black in colour ; operculum calcareous, 
paucispiral inside callous, and black outside, articulated. Posterior 
end of animal much shortened ; appears to absorb internal whorls. 
Palate, oo . 3 . 1 . 3 . oo . Median small, toothed. 1st lateral 
broad, subtrapezoidal, upper edge reflexed and denticulated near 
outer portion. 2nd, very small, almost hidden. 3rd, with large 
prominent head or cap, nearly semicircular, edge crenated. Uncini 
numerous, reflexed, toothed ; outer ones serrated. 
Turbinidje. Turbo (Lunella T) undulata, No. 1. — Two to 
three inches in diameter, deeply umbilicated. Operculum calcareous, 
subspiral inside, callous outside. Hab., seaweed on rocks at low 
water. Called “ Warrener.” Edible. Common often bears Pileopsis, 
No. 28, parasitic. 
Palate very large and beautiful, oo . 5 . 1 . 5 . oo . Median reflexed 
slightly, smooth with process above. Five laterals reflexed, cre- 
nated, outer edges of bases expanded, overlapping at sides. 1st 
unc. small, claw-shaped tooth ; 2nd with large, smooth tooth, sides 
crenated ; the others gradually diminishing in size, gradually 
changing into a ligulate form, with ends slightly reflexed. Spe- 
cimen in cabinet of E. M. S. 
Pliasianella, No. 5. — Hab., low water and below, rarely seen 
above ; live shells rare, dead ones plentiful in some parts. This 
shell is most beautifully marked with crescentic-shaped patches of 
various shades of pink, red, purple, brown, and yellow, forming 
different patterns ; the crescents sometimes running together and 
forming irregularly-shaped markings ; in others more regular, and 
in longitudinal rows, 'generally close together, but in varying dis- 
tances and sizes, down to very fine longitudinal lines in which the 
crescents are very small. Occasionally marked as in the drawing 
in Woodward’s ‘ Manual of Mollusca,’ but rarely. It is very rarely 
found perfect ; even when alive the lip is very brittle. 
