Mr. Jeffreys' Synopsis of British Species of Teredo. 123 



of T. megotara, that Dr.Lukis proposed the name of " microtara" 

 for this species. Specimens in cork are frequently encysted. 



5. T. malleolus^, Turton. 

 Habitat : in floating wood thrown up on the coasts of Car- 

 marthen Bay (Jeffreys), Guernsey (Lukis), Sussex (Dennis). 



6. T. excavataf, n. s. (Lukis, MS.) 



Tube short, rather solid, and detached from the wood, slightly 

 curved, jointed at intervals, with a very few internal trans- 

 verse wrinkles at the opening, and an indistinct siphonal 

 ridge. Valves roundish-oval, thin, compressed ; body glossy, 

 marked with distant, but regular and fine, striae or impressed 

 lines ; anterior auricle plaeed nearly at a right angle with the 

 insertion of the fang, strise rather numerous and waved ; 

 posterior auricle dilated and somewhat reflected, apex nearly 

 on a level with the crown or umbo of the valve, inner margin 

 free and well defined ; tubercle slight, and not visible when 

 the valve is in a supine position; fang obtuse; apophysis 

 thin and narrow. Pallets long and narrow, bifid in front to 

 nearly half their length, with two corresponding tubular 

 cavities which terminate in separate points like the prongs of 

 a steel fork; underneath they are abruptly sloped towards 

 the bifurcate points^ and closely striated in a longitudinal 

 direction; stalks nearly as long as pallet's, pointed at one end 

 and at the other merging into the pallets. 



Dimensions : length (of valves) ffl ; breadth -^y. 



Habitat : in drift fir, Guernsey (Lukis), Sussex (Dennis) ; 



rare. In the shape of the pallets this species is allied to T. 



elongata. 



7. T. bipartitaf, n. s. 



Tube , ? Valves oval, thin, compressed, covered with a 



brownish epidermis ; body smooth and glossy ; anterior auricle 

 moderately developed, angle rather obtuse, striae very nume- 

 rous and crowded ; posterior auricle rounded, small but pro- 

 minent, appressed to body, apex placed below the crown, 

 internal margin indistinct ; fang narrow and pointed ; tubercle 

 small; apophysis narrow. Pallets resembling those of T. 

 pedicellata, but longitudinally divided into two equal parts by 

 a deep furrow; stalk cylindrical, rather longer than pallet. 



Dimensions : length (of valves) ^j" ; breadth X". 



Habitat: in Cedrela odorata (or "West India Cedar"), 



thrown ashore, perhaps by the gulf stream, at Guernsey, with 



T. spatha (Lukis). 



8. T. pedicellata, Quatrefages. 

 Habitat : Channel Isles, in submerged wood (Lukis) ; in the 



