PHYLLIDIACEA. | 
Shell ovate, subpellucid, provided with from ten to twelve 
moniliform, tesselated, red rays; apex acute, and submarginal ; 
ground colour of the exterior of an opaque reddish-white. 
Length somewhat more than a quarter of an inch; breadth 
about a fourth narrower than its length. 
This shell was discovered by Professor Forbes, on the Manx 
coast, adhering to shells in deep water, who says it is allied to 
the Patella virginea, but differs from that species, in never at- 
taining so large a size; and in the markings, especially in the 
young shell, being of a bluish-white colour, with red rays. 
Genus 18.—Cuiton.—Linneus. 
Shell elongated, or oblong-oval ; consisting of eight valves, 
placed transversely on the back of the animal, which is convex ; 
these valves are moveable and imbricated, the edge of the one 
resting on that below it, the terminal ones being rounded exte- 
riorly; valves surrounded by a coriaceous marginal skin, or 
ligament; several of the valves are provided with marginal 
teeth, which are, however, concealed by the marginal liga- 
ment. 
Section I.— Marginal ligament spinous. 
1. Cnrron Fascricutaris, pl. XXI, f. 5 and 8. 
Chiton fascicularis, First Ed., pl. 35, f. 5 and 8; Linné, p. 
1106; Montagu, p. 5, pl. 27, f.5; Maton and Rackett, p. 21, 
pl. 1, f 1; Brown, Ency. Brit., p. 402; Ib., Wernerian Mem., 
p- 503; Fleming, p. 288; Ib., Edin. Ency., VII, p. 103; La- 
marck, Syst., VI, pt. Ist, p. 321; Lowe, Zool. Journ., II, p. 96; 
Ency. Meth., pl. 162, f. 15; Forbes, p. 37. 
Shell subcarinated; the carina of the valves longitudinally 
striated, their sides thickly studded with coarse, elevated gra- 
nules, which are distinct to the naked eye; the centre of the 
first and last valves destitute of the longitudinal strie; ligamen- 
tary margin also provided with coarse granulations, more or less 
spinous, and furnished with fasciculi of grayish, short bristles, 
situate at the interstices of the valves, on the sides, and round 
the first and terminal valves; marginal teeth of the valves vari- 
able, sometimes having three notches on each side, with the 
intermediate space crenulated; these crenulations are sometimes 
so deep in the last valve, and reach within a short distance of 
either extremity, that they may almost be considered as teeth ; 
the colour is variable, generally cinereous, or dark olive-green ; 
marginai fringe very distinct, and bristly. Length varying from 
a quarter to three-quarters of an inch; breadth somewhat more 
than half its length. 
This species seems liable to variety, as it will be noticed that 
fig. 8, which was drawn from one procured by Dr. Goodall on 
the rocks at Weymouth, has twenty-one tufts of hairs, one of 
which is placed on the extreme point of the terminal valve, 
while, in general, only twenty fasciculi are met with, none being 
on the terminal valve. Montagu says that this species has only 
eighteen tufts. 
This shell is not uncommon on many of the British coasts ; 
and is a deep water species, generally found attached to oysters 
and stones. The very fine specimen from which fig. 5 was 
drawn, was procured at Lough Strangford, County of Down, 
Treland, where it is plentiful of that size. The smaller one, fig. 
8, is not uncommon in the Frith of Forth. 
R 
MOLLUSCA. 65 
2. CuiTon pDiscREPANS, pl. XXI, f. 20. 
Chiton discrepans, First Ed., pl. 35, f. 20; Chiton 
Ency. Meth., p. 163, f. 11, 127 
Shell much elongated, narrow, acutely carinated; valves 
shield-shaped, and acutely pointed beneath; along the centre 
of the valves is a lance-shaped elevation, which is striated lon- 
gitudinally ; valves covered with strong, round, elevated, regu- 
2 

larly set papille, except at the edges, which are plain; at the 
junction of each valve is a tuft of strong, straight, stiff bristles ; 
whole margin beset with rather distant, very minute, gray hairs; 
valves generally of an orange-yellow; margin deep umber- 
brown. 
This species. differs from the preceding in being much more 
carinated, in the valves being a third narrower, in the fasciculi 
of bristles being shorter and more stunted, in the papille being 
round instead of oval, and the whole shell being much narrower 
in proportion to its length. 
Several specimens of this shell, new to the British Concho- 
logist, were sent to me from George Lyons, Esq., of Tenby, 
Wales, where it is common, and where it was mistaken for the 
C. fascicularis. 
3. Cuiron crinitus, pl. XXI, f. 20. 
Chiton crinitus, First Ed., pl. 35, f. 20; Pennant, IV, p. 71, 
pl. 36, f. 1, 1; Gmelin, Linn. Syst., p. 3206; Montagu, p. 4; 
Maton and Rackett, p. 20; Fleming, Edin. Ency., p. 103. 
«“ Shell with seven valves; thick set with short hairs; five- 
eighths of an inch long. Inhabits the sea, near Aberdeen.”— 
Pennant. Mr. Boys informed Montagu that he had also found 
it at Sandwich. 
Section I1—Marginal ligament striated, or papillose. 
4. Curron tavis, pl. XXI, f. 10, 11. 
Chiton levis, First Ed., pl. 35, f. 10, 11; Pennant, IV, p. 72, 
pl. 36, f. 3; Montagu, p. 2; Brown, Ency. Brit., p. 402; Ib., 
Wernerian Mem., p. 503; Fleming, Edin. Ency., p. 102; Ib., 
Brit. An., p. 90; Forbes, p. 37; Maton and Rackett, p. 21. 
Shell with eight smooth, slightly carinated, pointed valves, 
generally of a deep reddish-brown, mottled with white, but is 
liable to considerable variety both in colour and markings, with 
remote, nearly obsolete striw; margin broad, fringe very minute, 
with fine decussated strie. Length a little more than half an 
inch; breadth more than half its length. 
Found on many of the coasts of Great Britain and Ireland, 
in deep water, although it may be considered a local species. 
First noticed in Loch Broom, Rossshire; the Frith of Forth, 
coast of Northumberland, Devonshire, Manx coast, and at 
Rathgarmont, Lough Strangford, Ireland. 
5. Cuiron acuatinus, pl. XXI, f. 4, 12, 13, and 15. 
Chiton achatinus, First Ed., pl. 35, f. 4, 12, 13, and 15; 
Brown, Ency. Brit., VI, p. 402. 
Shell very oblong; valves narrow, and long in proportion to 
their breadth, considerably elevated in the centre, but not cari- 
nated; pale lilac-coloured in some specimens, and olive-green 
in others, beautifully marbled with reddish-brown, and indis- 
tinctly striated transversely, following the wave of the valves; 
both anterior and posterior terminal valves are covered with 
transversely arcuated strie, and the whole of them very minutely 
shagreened; margin with upright oval, minute specks of sha- 
green. 
