122 TEREDO. 



— Like T. navalis, but not oblique, having a straight angle 

 at the hiatus, tube chambered ; spade-shaped pallets convex 

 at the end. 



3. MEGOTHOEAX, f. 10, Gould, MS. — ValvjE praeeedenti 

 similes, sed rectse, altse. Tuba . . . ? Palmulse . . . ? — Differs 

 from the preceding by the height and straightness of the 

 valves. 



4. MEGOTAEA, f. 5, Hcmley. — Valvse breves, area antica 

 parva, ala postica expansa, supra umbones elevata, acute 

 uncinata. Palmulee breviter ligoniformes, ad terminum con- 

 cavae. — Valves short, with small anterior area, and posterior 

 wing expanded, elevated and curved above the umbo. Pallets 

 shorter than those of T. navalis, and convex at the end. 



5. MALLEOLUS, f. 6, Tuvton. — Valvse angustas, valde 

 arcuataB, ala postica parva, elevata, uncinata. Palmulae 

 brevissimae, processu prominenti, brevi. — Like T. megotara, 

 but narrow, and much curved, and the elevated posterior 

 wing much smaller. 



6. SENEGALENSis, f. 12, BlainvUle. — Valvae . . . ? Tuba 

 annulatim rugata. Palmulae parvae, digitatas. — No valves are 

 found with the specimens in the British Museum, but the 

 tubes (in holes bored across the wood) are curiously wrinkled. 

 The pallets are small and fingered. 



7. DENTicuLATA, f. 19, Gray, Mus. Brit. — Valvae breves, 

 umbonibus callosis, unidenticulatis, area antica brevissima, 

 ala postica expansa, superne elevata, uncinata. Palmulae 

 oblongo-ligoniformes ad latera utrinque unispinosae. — Short, 

 with very small anterior area and expanded posterior wing, 

 like that of T. megotara. Umbonal callus forming a den- 

 ticle. Pallets oblong spade-shaped, with a spine on each 

 lateral edge. 



8. AFFiNis, f. 13, Deshayes. — Valvae rotundae, area antica 

 parva, ala postica lata, rotunda. Palmulae ligoniformes 

 superne corneo-digitatae. — Valves resembling T. navalis, but 

 less oblique ; pallets with the stem long, the spade-like part 

 short, with horny finger-like projections at the top. 



9. BATAVUS, f. 17, Spengler. — Valvae breves, ala postica 

 angustissima, semilunari, elongata. Palmulae ligoniformes, 

 stipula elongata, spatula divisa, infra cornea. — Resembling 



