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



Bay (Jeffreys), Scarborough (Leckenby), Oban (Bedford), 

 Guernsey (Lukis), Sussex (Dennis). 



3. T. nanaf, Turton. 



Pholas Teredo, Miiller (Zool. Dan. prodr.) and FabricirtS ? 



T. navalis, Moller? 



T. denticulata (Gray), Fischer. 



Habitat : in floating wood thrown up on the coast ; Car- 

 marthen Bay (Jeffreys), Larne, County Antrim (Paterson), 

 Guernsey (Lukis). It occurs with the next species, as well as 

 with T. megotara, but it is by no means so gregarious or abun- 

 dant as either of those species. 



It differs from T. megotara in the valves being more com- 

 pressed and solid, in the anterior auricle being much smaller 

 and having a more obtuse angle and fewer strise, in the pos- 

 terior auricle being larger and higher, and especially in the 

 very strong and prominent tubercle or false tooth. The tube 

 of T. nana appears to be destitute of calcareous lining, except 

 towards the entrance, while T. megotara forms a solid tunnel ; 

 and the lunule of the pallets is more incised in T. nana. Adult 

 specimens measure 21 inches in length. The Turtonian types 

 decidedly belong to this species, and not to megotara. 



4. T. subericola, n. s. (Macgillivray, MS.) 



Tube rather thin, and adherent to wood, short, of the form of 

 an elongated cone, curved at the opening, with internal irre- 

 gular transverse septa, which are close- set at the extremity. 

 Valves oval, rather convex, thin ; body smooth and somewhat 

 glossy; anterior auricle short, angle obtuse, strise rather 

 numerous; posterior auricle narrow, falciform, reflected at 

 the outer edge, with its apex raised above the crown ; tubercle 

 strong and prominent; fang long, narrow, and incurved; 

 apophysis rather broad. Pallets short, pear-shaped, com- 

 pressed, and expanded towards the anterior margin, with a 

 semilunar depression in the middle and a longitudinal groove 

 in front ; stalk short and pointed. 



Dimensions : length (of valves) / n ", breadth gV'. 



Var. minor. 



Habitat : Guernsey, in drift fir (Lukis) ; var. minor, Aber- 

 deen, in cork (Macgillivray), Swansea and Carmarthen bays, in 

 fishermen's cork net-floats (Jeffreys), Plymouth (Webster), Pal- 

 mouth (Norman), in similar material. The embryonic state of 

 some of the specimens which occur living in cork, as well as the 

 nature of the material, induce me to consider this species indige- 

 nous. The posterior auricle is so small in comparison with that 



