122 Mr. Jeffreys’ Synopsis of British Species of Teredo, 
Bay (Jeffreys), Scarborough (Leckenby), Oban (Bedford), 
Guernsey (Lukis), Sussex (Dennis). 
3. T. nanat, Turton. 
Pholas Teredo, Miiller (Zool. Dan. prodr.) and Fabricius ? 
T. navalis, Moller? 
T. denticulata (Gray), Fischer. 
Hasrrat: in floatmg 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 7. 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 striz, in the pos- 
terior auricle being larger and higher, and especially in the 
very strong and prominent tubercle or’ false tooth. The tube 
of 7. nana appears to be destitute of calcareous lining, except 
towards the entrance, while 7. 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. (Maegillivray, 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, striz 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 incutved ; 
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) ,5;", breadth 34". 
Var. minor. 
Hasrrat: 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), Fal- 
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 im comparison with that 
