Patella. MOLLUSC A. BRANCHIFERA, 
m 
Penn. Brit. Zool. iv. 143. t. xc. f. 148. Don. Brit. Sh. t. cxlvi. Laskey^ 
Wern. Mem. i. 411. Mmt. Test. Brit. Supp. 154. — Shores of Angle- 
sea, coast of Devon, and Frith of Forth, rare. 
Length three quarters, breadth half an inch, slightly depressed anteally, 
of a brown colour; the ribs are unequal, covered, especially towards the mar- 
gin, with arched reflected scales. Montagu compares it, when at a distance, 
to a nutmeg. 
155. P. pellucida. — Shell ovate, thin, pellucid, with lines of 
rich azure spots from the apex to the margin. 
P. mima, levis, pellucida, aliquot coeruleis lineis eleganter insignita. 
List. Conch, t. Dxliii. f. 27 — P. minor. Wall. Ork. 41 P. pull. Linn. 
Syst. i. 1260. Penn. Brit. Zool. iv. 143. — Common, on the broad 
leaves of various Fuci. 
Length sometimes nearly an inch, breadth |ths, height fths; nearly 
smooth, glossy, apex near the margin, frequently obsolete. The coloured 
lines vary in number ; in young specimens they are sometimes wanting, but 
in their place lines of brown. The branchial circle is interrupted at the 
head. The margin of the cloak is fringed with filaments of unequal length. 
156. P. leEvis. — Shell concentrically wrinkled, apex tubercu- 
lar, subcentral. 
lAst. Conch, t. Dxlii. f. 26. Penn. Brit. Zool. iv. 144. t. xc. f. 151.— 
P. ccerulea, Mmt. Test. Brit. Supp. 152. — On the stalks of the larger 
Fuci, common. 
Length upwards of an inch, breadth ,%ths, height /gths, of a brown colour, 
with purple lines from the apex. It is more or less wrinkled concentrically, 
and in old specimens ribbed longitudinally. In the young state, two small 
black spots are sometimes observable. It is distinct in its growth and habit 
from the preceding species, with which it has been frequently confounded. 
157. P. mrginea. — Shell oval, slightly wrinkled concentri- 
cally, with numerous reddish lines from the apex to the margin. 
Mull. Zool. Dan. Prod. 237 ; Zool. Dan. t. xii. f. 2, 3 P. parva, Mont. 
Test. Brit. 480 — On rocks and stones near low water-mark, common. 
Length about i%ths, breadth f*oths, and height J^th of an inch, of a red- 
dish, white colour, translucent ; apex a little in front of the centre, obtuse. 
Old shells become opake, and cease to exhibit the coloured lines. Tentacula 
white; cloak subrufous, with an entire margin. — The P. tessulata of Zool. Dan. 
nearly resembles this species, and, perhaps on our shores has been confound- 
ed with it. It is distinguished by the coloured lines being interrupted, and 
the margin of the cloak ciliated. 
The P. Clealandi described by Mr Sowerby, in the extracts from the Mi- 
nute-Book of the Linn. Soc. vol. xiii. 621., as found on stones at low water- 
mark, near Bangor, by James Clealand, Esq., is stated as possessing the fol- 
lowing characters : ‘‘ Shell oval, white, with red, brown, or purple spots ; 
faintly striated longitudinally, and still more faintly transversely ; summit 
obtuse, lateral, tinged with light purple ; margin entire ; inside white, with 
a dark brown muscular impression — The young shells are very thin, but the 
old are nearly opake. The size of the largest specimen yet found, is tenths 
of an inch in length, in breadth, and /^ths in height. There is a dark 
brown variety, Avith two indistinct rays from the apex, one on each side. 
