228 
HISTORY OF BRITISH CRUSTACEA. 
described as British by Dr. Leach. - * It was sent him by 
Mr., Stevenson, the builder of the Bell-rock light-house. 
Dr. Leachf remarks, “ It occurs in the greatest abundance 
at the Bell Bock, in the old woodwork used whilst the light- 
house was building, which it perforates in a most alarming 
manner, entering to the depth of two inches or more, boring 
in every direction. They seldom or never deviate from 
a straight line in their perforations, unless interrupted in 
their progress by a knot in the wood, when they pass round 
it. The female is one-third larger than the male, and may 
be readily distinguished by its pouch, which is easily seen, 
and in which the eggs and young ones after their exclusion 
are carried. The young ones in those I examined were 
generally seven in number, in some few nine, and in one 
instance only five.” One of the authors of the f Introduc- 
tion to Entomology/ J says that in December, 1815, he was 
favoured by Mr. Lutwidge of Hull, “with specimens of 
wood from the piers at Bridlington Bay, which wofully con- 
firm the fears entertained of their total ruin by the hosts of 
* Rathke described it in 1799 as the Cymothoa lignorum (see Skrivt. af 
Naturh. Selsk. v. 101, t. 3, f. 14). It is the Lirnnoria terebrans of Leach. 
Dr. Coldstream has published an elaborate monograph on Lirnnoria in vol. 
xvi, of the Edin. New Phil. Journal. 
f Linn. Trans, xi. 37 L 
t 6th ed. vol. i. p. 203. 
