found on the Coast of Aberdeenshire. 139 
gale of easterly wind, continued for several days, found, on 
the beach near Aberdeen, several pieces of cork, on examin- 
ing which I detected a great number of small live Teredines. 
The animals being minute, it was difficult at first to observe 
all their parts, but by cutting up the cork, this was at length 
in some measure accomplished. 
The largest perforations are an inch and a quarter in 
length, scarcely a twelfth of an inch in diameter at the inner 
or larger end, slowly narrowing toward the other or outer 
end, which communicates with the exterior by a circular 
aperture resembling the puncture of a small insect pin. The 
holes are tortuous, as usual, and appear to have been formed 
by circular movements, as their surface presents alternate 
Shallow grooves and slight ridges, not spiral, but annular. 
The calcareous lining of the cavity thus formed is a scarcely 
perceptible film, transparent, hyaline white, very minutely 
uneven, or bullato-rugose, on the inner surface, evanescent 
at the larger end, but generally of considerable thickness, 
and white at the outer. Sometimes, however, it is distinct, 
and white, although very thin. 
The animal fills the tube entirely, presenting the appear- 
ance of a subcylindrical, bluish-white, semi-transparent 
worm. At the anterior extremity, which is abrupt, are seen 
the circular convex extremity of the foot, and above it 
the transverse aperture of the mouth, furnished with slen- 
der, adherent labial palpi. The bivalve shell, situated 
there, forms a circular hoop, as usual. At the posterior ex- 
tremity of the mantle or envelope, are two lateral palmules, 
placed at the commencement of the two separated, unequal, 
retractile siphons, and, by meeting, capable of closing the 
cavity, when the siphons are drawnin. The viscera, par- 
tially visible through the mantle, occupy more than a third 
of the whole length; and beyond them are continued the 
narrow, elongated, coherent branchiz. 
The shell, of two very thin, diaphanous, white valves, forms 
a kind of ring, broad on one side, on the back of the animal, 
abruptly narrowed at the middle, and tapering to the other 
side, where they meet by a rounded point. They are in con- 
tact above, or on the back, at the hinge, which resembles that 
