454 DR. E. P. WRIGHT ON A NEW GENUS OF TEREDININ.JE. 
valuable lists in the ‘Annals of Natural History’*, and with none of these, I venture to 
think, can the species above described be confounded. Some may think it unnecessary to 
constitute even a new subgenus for its reception ; but, until the whole of the Teredines are 
more thoroughly investigated, it appears to me very difficult to know what characters to 
seize upon as of generic importance. In the meanwhile I trust this brief description 
may not be without interest. 
DESCRIPTION OF THE PLATE. 
PLATE XLVI. 
Fig. 1. Nausitora Dunlopei, natural size ; from a specimen preserved for many years in spirits. 
Fig. 2. The extremities of the siphonal tithes and the pallets, enlarged. 
Fig. 3. One of the pallets, enlarged, xem the core-like body and the rough, imbricated, scale-like 
structure. 
Fig. 4. Pallet, natural size, viewed from the outer surface. 
Fig. 5. Ditto, inner surface. | 
Fig. 6. The valves in apposition, front view. | 
Fig. 7. Inner surface of right valve. | 
Fig. 8. Outer surface of ditto. | 
Fig. 9. The valves in apposition, back view. : | 
Fig. 10. Portion of right valve, enlarged, showing the head-like markings. | 
Fig. 11. View of right valve (enlarged twice and a id , showing the accessory nacreous plate, the * body,” | 
and the “ triangular area.” | 
Fig. 12. Ditto, seen seimas (enlarged twice), showing the elongated curved process from the umbonal | 
cavity. | ١ | 
Pos | 
| 
* Dr. J. E. Gray in Annals of Nat. Hist. 1851, vol. viii. p. 380. Mr. J. G. ie in Annals for HUS B00. | 
V'ide also a paper by Dr. Gray in the Philosophical Magazine, vol. ii. 1827, p. 409 | 
