TEREDO. 1089 



NAVALis. 2. Shell sub-cylindrical, very thin and 

 smooth. 



Teredo navalis. Lirmaus Syst. Nat. p. 1267- Pennant 

 Zool. iv. p. 147. Sihroeter EinL ii. p. 572. Gmelin, 

 p. 3747. Montagu Test. p. 527, and Supp. p. 7. Home 

 in Phil. Trans. 1806. p. 276. t. 12 and 13. Donovan, 

 V. t. 145. Maton and Packet, in Lin. Trans, viii. p. 

 249. Dorset Cat. p. 60. t. 18. f. 21. Burrow's Ele- 

 ments, p. 178. t. 22. f. '4. 

 Teredo vulgaris. Lamarck Sj/st. des jinim. p. 128. 

 Serpula Teredo. Da Costa Brit. Conch, p. 21. 

 Le Taret. Adanson Senegal, p. 263. t. \9. (. 1. 

 Favanne, t. 60. f. C 1, C 2, and C 3. Enc. Meth. t. I67. 

 f. 1 to 3. 

 Inhabits tlie sea in the sides and bottoms of sliips and other 



timber, which it perforates. 

 Shell sometimes a foot long, and about three-quarters of an 

 inch in diameter at the lower extremity, from which it tapers 

 slightly to the summit, but the shell in these climates is rarely 

 more than half so large ; it is thin, brittle, slightly flexuous, 

 and of a whitish colour. Linnaeus, considering the valves 

 which are placed at the two ends of the animal to be of the 

 nature of opercula, has arranged this shell among the Uni- 

 valves ; whilst others, who consider them to be similar to the 

 accessory valves of a Pholas, think it ought to be placed 

 with the Multivalves. Both the shell and the animal have 

 been described at great length in the works above quoted, by 

 Adanson, Home, and Montagu. Another species in La- 

 marck's Systeme des Animaux sans Vertebres is mentioned 

 under the name of Teredo bipalmulata, as follows : " Ce 

 Taret, qui vit aussi dans I'interieur des bois plonges sous les 

 eaux marines, est plus grand que le Taret commun. II est 

 remarquable par deux bras ou palettes articulees, subpinnees, 

 situees h son extremite inferieure. On en voit un individu 

 dans la Collection anatomique du Museum, qui est devenue 

 si interessante par les belles dissections et preparations du 

 citoyen Cuvier." 



uTRicuLus. 3. Shell sub-cylindrical, thick, flexu- 

 ous, and the aperture at the summit divided 

 by a partition. 



Teredo Utriculus. Gmelin, p. 3748. 

 Kammerer Cab. Rudolst. p. 7. 1. 1. 

 Inhabits wood in the sea. Kammerer. 



