120 
A C0ENI8H FAUNA. 
Genus, Asellus. — Geoffray. 
Body long, oval, like Janira. First antennse short, second 
long. First pair of legs with hands, aU the rest pediforrH) 
slender. 
Asellus aquaticus.- — Linnmus, Syst. Nat., ii, 1061. — Bate ani 
Westwivod, p. 343. 
Common in freshwater ponds and ditches throughout the 
kingdom. 
Genus, Limnoeia. — Leach. 
Like Asellus, but with shorter segments to the body. PosterioJ" 
portion divided into six segments. 
Limnoeia lignoeum. (The Gribble). — Rathhe, Slcrilt. af Natar- 
Selslc., vol. 101, t. 3,/. 14 (1790). — Bate and Westwood, p 351. 
All round our coast, in submarine timber, which it eats witt 
avidity. The bores are one fifteenth of an inch in diameter- 
Admiral Sir W. Drummond, when Superintendent of H.M. Dock- 
yard, Devonport, afforded me every facility to examine the 
submerged timber in the arsenal and Sound. Assisted by fte 
extensive knowledge and experience of Mr. Moore, the master 
shipwright of the yard, I was by comparison of dates, according ^ 
the length of time that the timber was submerged, able to arriv® 
at a general conclusion that these animals destroyed the sunken 
wood at the average rate of one quarter to half an inch in depth 
a year. The earlier years were scarcely as much, but that with tim® 
the rate increased, so that a five inch solid balk of timber would b® 
eaten up in about ten years. They seemed to attack all timber® 
equally, but the knots resisted their depredation, and the mo®* 
successful of artificial means was the rust that penetrated th® 
wood from the presence of nails and bolts of iron. 
ARCTURIBM. 
Genus, Aectueus. — Latrielle. 
Body long. First antennse short ; second antenneo long. 
anterior legs filiform. Three posterior pediform. 
Aectueus longicoenis. — Sowerly, Brit. Miscel., t. 19. — Bate 
Westwood, p. 365. 
