ACCOUNT OF 



Arca. 



£ 0 Noae. 



3. minuta. 

 caudata. 



4. nucleus. 



5. tenuis. 



6. rostrata, 



ing part of the shore near 

 Dunbar ; but of late I 

 have not met with a single 

 specimen. Pennant, no 

 doubt, meant this shell, 

 when he applied the name 

 of tortuQsa to a species of 

 ark, which, by the en- 

 graving, appears to be the 

 A. pilosa or glycimeris. 

 M. A very minute specimen, 

 bearing the characters of 

 Nose, was taken off Dunbar 

 by dredging. I have also 

 taken one similar on the 

 coast of Cornwall. 

 Dunbar and Leith Roads, 

 not very uncommon. 

 P. D. M. Dunbar and other parts of 

 the coast, not uncommon. 

 M. New species, very rare ; on- 

 ly one specimen ever oc- 

 curred, a live shell, Dun- 

 bar. 



M. Deep water, Frith of Forth, 

 very rare. One live spe- 

 cimen and two dead valves 

 have been taken.. 



M. 

 D. 



PECTEN. 



Animal a Tethys. Shell bivalve, ine qui valve, 

 most times ribbed or striated longitudinally. 

 Hinge toothless, with a small subtriangular ca- 

 vity, aurated 0 



