142 
PATELLA. LIMPET. 
indented, and toothed: length about three quarters of an 
inch; breadth half an inch; height a quarter. 
Western coasts, and Dublin bay. v. m> 
19. Patella Zetlandica. Shetland Limpet. 
Edinhurg Encyclopaedia, viii. p. 66. no. 17- 
Shell oblong, conic, glossy white, transparent, furnished 
from the point to the margin with numerous equal tubercled 
libs : crown much raised, nearly straight and central, trun¬ 
cate, not in the least curved, with an oval perforation which 
is beaded round the edge by the tubercled ribs; the base 
nearly round, undulate or beaded; inside glossy white: 
length hardly a line ; height as much. 
This beautiful minute species, which was first described, 
we believe, by Dr. Leach, as having been found among 
some small shells from Shetland, was discovered by Mr, 
Tardy, in the unc drifted rand from Portnmrnock, in Dub¬ 
lin bay: it differs from the last, in being as long as it is 
broad, and in having both the base and the crown beaded 
round the circumference. t\ in. 
20. Patella Nubecula. Red-rayed Limpet. Eg. 81. 
Lister, pi. 529. 
Shell oblong-oval, sometimes a little contracted in the 
middle, semitransparent, a little convex, white with red or 
nrowxush-red rays which are broader or narrower, some* 
times interrupted, and often not extending quite to the 
crown, with numerous obscure longitudinal ribs, and a few 
irregular transverse furrows which give it a rather rugged 
appearance towards the margin: crown not quite central, 
with an oblong perforation, round which is often a purplish 
rmg; inside white, glossy, with a purplish ring round the 
perforation at the bottom ; the margin plain; length five 
eighths of an inch; breadth and height about three- 
eighths. 
*1 hesc shells have been frequently brought to u$, ss 
having been dredged off the Land’s End, on the Cornish 
coast, j but it has not occurred to us, as yet, to find them 
ourselves, v. m. 
PHOLAS. 
