CONCHYLI A— i)/T//yE^. 1. 15 



ear-shaped process behind, the edges of which are not detached 

 round the whole of the circumference. 



The tube is more or less flexuous and tapering, semiconcamerated 

 near the smaller end. The supplemental valves, seated on the 

 inside of the tube and near the smaller extremity, are spoon- 

 shaped, convex on the outside and concave within, terminating at 

 one end in a linear elongation which is straight or a little flexuous, 

 and truncate at the other. 



Fig. 2 of our plate represents a section of the lower end of the 

 tube, to shew its semiconcamerated structure : and fig. 3 one of 

 the spoon-shaped appendages. 



Teredo valvis postice auriformibus auriculis reflexis, casta obliqud bipennat*. 



marginali supra denies. 



Shell with the valves ear-shaped behind and the auricles reflected, 



an oblique rib on the margin above the teeth. 

 Teredo bipennata. Turton Conch. Diet. p. 184, fig. 38 to 40. 

 Mus. nost. From timber drifted into Exmouth. 



Shell something larger than the last, with the ear-shaped processes 

 of an oblong shape, reflected on their outer margin and detached all 

 round the circumference on the under side. 



The tube is thicker and stronger, without the transverse semi- 

 concamerated partitions, and instead of the spoon-shaped valves 

 furnished with two very long slender appendages, somewhat curved 

 &nd feathered on each side. 



