iy ong We gage 
Transparent Patella. Br. Sool. 4. No. 150. tab. 90. fig. 150. 
Patella Levis. Smooth Patella. Br. Zool. No. 151. an old shell. 
Patella Czruleata. Blue rayed. Da Costa. Br. Conch... 4. tab... 
jig. 5.6. 
Lepas d’eau douce demi-ovoide transparent, a trois lignes bleues. 
D Avila, tab. \. p. 428. No. 962. 
In the young state, this shell is very transparent and horny, the 
aperture ovoid, and the margins smooth and level; it has also seve- 
ral longitudinal lines of bright blue colour, which extend from the 
vertex down the back to the margin. According to Linnzeus, these 
should be four in number; some authors say five, and Borlase men- 
tions nine. The blue colour is disposed in spots in some specimens ; 
in others in lines; and again in some others in short and:interrupted 
dashes. Linnzeus observes that the bright blue colour has not been 
found in any Shell except this. 
The old shells are very different from the young ones, and have 
been mistaken by some Authors for distinct species. The young shell 
is remarkable for its pellucidity. ‘The old ones are thicker and larger : 
the aperture irregular : the vertex two-thirds of the shell; and the 
rays of blue, dusky. Fig. I. * represents the natural size. 
The Shell is found on the coast of Cornwall, and on the Dorset 
coast, near Weymouth. Martin, Sibbald, and Wallace, received it 
from the western isles of Scotland and the Orkneys. 
