224 PHOLADID. 
and Teredo, &c., from the bottom to the top of the scale of 
the Bivalves, is not an injudicious procedure. 
The other British Teredines are— 
T. norveaica, Spengler. 
T. norvegica, Brit. Moll. i. p. 66, pl. 1. f. 1-5. 
T. navaLis, Linneus. 
T. navalis, Brit. Moll. i. p. 74, pl. 1. f. 7, 8, and pl. 18. f. 3, 4. ; 
The following are exotic :— 
T. BIPENNATA, Turton. 
T. bipennata, Brit. Moll. i. p.80, pl. 1. f. 9-11. 
T. MALLEOLUs, Turton. 
T. malleolus, Brit. Moll. i. p. 84, pl. 1. f. 12-14. 
T. panmuLata, Lamarck. 
T. palmulata, Brit. Moll. i. p. 86, pl. 2. f. 9, 10, 11. 
XYLOPHAGA, Turton. 
X. porsaLis, Turton et Auctorum. 
X. dorsalis, Brit. Moll. i. p. 90, pl. 2. f. 3, 4; and u. p. 375. 
We met with this species alive many years since, at Ex- 
mouth, and greatly regret that it passed unobserved. 
Having inserted a paper in the ‘ Annals of Natural History’ 
on the Terebrating Mollusca, we will only state, that it is now 
generally considered that the foot and fleshy part of the 
ventral surface of the mantle, aided by the fine sand and 
siliceous particles that are a part of the animal’s attributes, 
are the excavating agents. See Mr. A. Hancock’s excellent 
Memoir on these points, in the ‘Annals of Nat. Hist.,’? N.S. 
ii, p. 225. . 
