228 HISTORY OP BRITISH CRUSTACEA. 



described as British by Dr. Leach. * It was sent him by 

 Mr. Stevenson, the builder of the Bell-rock light-house. 

 Dr. Leach t remarks, " It occurs in the greatest abundance 

 at the Bell Kock, 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 1 examined were 

 generally seven in number, in some few nine, and in one 

 instance only five." One of the authors of the ' 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 Limnoria terebrans of Leach. 

 Dr. Coldstream has published an elaborate monograph on Limnoria in vol. 

 xvi. of the Edin. New Phil. Journal. 



f Linn. Trans, xi. 371. % 6th ed. vol. i. p. 203. 



