410 Mr. Gray's Monograph of the Genus Teredo. 



trically striated, internal tooth ? Pallet? Fossil: High- 

 gate. 



Teredo antenauta. Sow. Foss. Shells. 



Differs from the above in being larger ; but I have no spe- 

 cimen to make an accurate description. Fossil : Highgate. 



Sei-pula arenaria, Linn. ed. 10. Scrpida foliithalnma, Linn. 

 Septaria arenaria, Lam. Teredo, Home, Phil. Trans, and 

 Anat. Comp. ii. t. 41. 4. Rumph. t. 41. f. D. E. Seba, iii. t. 94. 



Tube very large, club-shaped, thick, behind closed, rounded, 

 upper part divided into two tubular canals. 



The valves are not in the Museum ; but it is evidently a 

 Teredo, and the division of the mouth is not enough to form a 

 genus, as it is partially found in other species. 

 * * Pallet broad lamellar. 



Teredo 7iavalis, Linn. Turton. Sow. Gen. Turton, Bivalves. 



Adanson, Acad. 8ci. Par. t. 9. f 1—8. cop. Ency. Meth. 

 t. 187. f 1—3. and t. 167. f 4. 5. 



Tubes long subcylindrical, tortuous end chambered. Shell 

 globular, anterior gape roundish triangular ; hinder one ovate 

 lanceolate; the lower edge of the anterior lobe straight. Valves 

 two-thirds as long as high ; internal process broad, parallel to 

 the valves ; pallets broad, ovate, lamellar and blunt. 



Teredo Malleolus. Turton, Bivalves, t. 2. f 19. The pallet, 



«' Shell with the valve earshaped behind, and the auricules 

 reflected. The pallet transverse mallet-shaped." Turt. 



Teredo nana. Turton, Bivalves, t. 2. f. 6. 7. 



" Shell with the valves rounded, and without auricules be- 

 hind, a strong tooth on the margin above the tooth." Turt. 

 Bivalves. 



*** Pallet ovate lamellar, end dentiadated. Fistulana, Lan). 

 Teredo Clava, Gmel. Fisttdana gregata, Lam. 



Ency. Meth. t. 167. f. 6—15. 



Tubes club-shaped, contorted, aggregate and rounded, 

 closed; mouth half-divided lamellar; shell ring-like, valves 

 very short and high ; front gape rounded ; hinder one ovate ; 

 internal tooth linear and dilated hatchet-shaped ; pallet broad 

 lanceolate and acute ; sides denticulated. 



Fistulana corniformis. Lam., which I have not seen, does not 

 appear to differ by the figures much, if at all, from this species. 



The other species o^ Fistidana of Lamarck are all the cases 

 of GastrochcEiia, except perhaps Fistulana clava, which if it 

 does form a separate genus, it must be placed near the Gas- 

 trQchcenae, and not with the Teredines. 



**** Pallet long, base setaceous, end subarticulately 

 divided, sheathed arid pinnately lobed. 



Teredo bipahnulata, Lam. Syst. T. palmidatus. Lam. Hist. 



Tarei de Fondichernj, Adanson, Acad. Sci. Par. 1759. t. 9. f. 12. 



*^ Tubes 



