472 PROCEEDINGS OP THE ACADEMY OP 



Dimensions. Length of valves half an inch ; breadth somewhat less. Length 

 of tube about one foot ; but individuals have occurred in which the tube is 

 two and one-half feet long and tbe valves three-fourths of an inch. 



Mr. Jeffreys considers the T. corniformis of Lamarck to be the tube of 

 this species, wbich is very probable, and I have therefore placed that species 

 among the synonyms of Norvagica. 



The present shell is the T. navalis of all British authors prior to Forbes 

 and Hanley's Mollusca, the confusion of the species originating in the misera- 

 ble description of the Syst. Naturse, which will apply equally well to any spe- 

 cies of the genus, and continued, probably, from the difficulty of procuring ex- 

 tensive suites of specimens, and from the uninviting nature of their study. 



The figures of DeKay are copied from Turton, and therefore represent this 

 shell and not the true T. navalis. 



The illustrations in Donovan and Pultney will suit equally well for this or 

 either of the other British Teredse. 



T. nigra, Blainville, is considered by Messrs. Fischer and Jeffreys to be a 

 synonym of Norvagica, and not having seen specimens, I have followed 

 them in including it here, but as it appears to me that the original description 

 does not exactly suit Norvagica, I reproduce it here. 



" Coquille assez grande, de quatre a cinq lignes dehaut sur autant de long, 

 epaisse, solide, entierement couverte d'un epiderme noir ; cote posterieur ou 

 tranchant fortement anguleux et striae au moius de soixant stries tres-serrees, 

 aurtout sur la partie verticale ; pallets ovales, alongees, non-tronqufes. 



Cette grande espece de taret, dont je possede un individu envoye par Mile. 

 Warn aM. DeFrance, a ete trouvee sur les cotes d'Angleterre, dans la carcasse 

 d'un navire venant de l'lnde et echoue depuis long-temps a quelque distance, 

 du rivage. Elle est parfaitement distinct par sa taille, sa couleur, et par le 

 nombre considerable de ses stries. 



T. pedicellata, Quatrefages. 



T. pedicellatus, Quatrefages, Ann. des Sc. Phys. 3d ser. xi. p. 2(3, t. 

 1, f. 2. Adams, Genera, ii. p. 333. 



T. pedicell at a, Fischer, Journ. Conchyl. 2d ser. i. p. 139. Jeffreys, 

 Ann. and Mag. Nat. Hist. 3d ser. vi. p. 123. 



Hab. Islands in the British channel and Northern Coast of Spain and Al- 

 giers. 



Description. " Coquille subspherique a peu pres aussi longue que large ; 

 angle antcrieur presque droit (90), tombant fort en arricre. Stries trts-fines 

 et tres nombreuses. Palmules etroites, allongees, portees a l'extremite d'une 

 sorte de manche d'apparence cartilagineuse. Le pedicule est toujours blanc, 

 tandisqueles palettes sent colorees en bron fonce. Taille inferieure de moiti^ 

 environ acelle du Ter. Norvagica." Fischer. 



" Although the valves in adult specimens bear a close resemblance to those 

 of the following species, (T. marina) the pallets are unmistakably different ; 

 and in the young the stria? on the anterior auricle of the valves are much 

 fewer, and consequently more remote than in that species. Where both spe- 

 cies occur together, the present occupies the outer layers of the wood, while 

 the other penetrates into its recesses. Quatrefages discovered this species at 

 Guibuscoa, on the North coast of Spain ; and I noticed it in some wood which 

 M. Deshayes had taken on the Algerine coast. The tube is a beautiful object, 

 being jointed in an imbricated manner, like the stalk of an equisetum.' , .L f- 

 freys. 



T. Senegalensis, Blainville. 



T. Senegalensis, Blainville, Diet, des Sc. Nat. lii. p. 2(37. Jeffreys, 

 Ann. and Mag. Nat. Hist. 31 ser. vi. p. 126. Adams, Genera, ii. p. 333 



[Sept! 



