PREFACE. 
It must also be observed, that various new shells have been discovered by 
W. C. Trevelyan, Esq. Junior, of Wallington, and Stewart Ker, Esq. of 
Greenock. 
The Author's best thanks are also due to the following gentlemen for the 
profit he has reaped from a free access to their valuable cabinets ; viz. Dr 
Leach, John Trevelyan, Esq. of Wallington, Northumberland ; Dr Goodall, 
Provost of Eton College, George Lyons, Esq. of Tenby Wales, Thomas Allan, 
Esq. John Nicol Esq. James Gerard, Esq. and John Brown, Esq. surgeon in 
Edinburgh : and David Falconar, Esq. of Carlowrie. 
And for his Irish information, the Author feels deeply indebted to Mr J. 
O'Kelly, Esq. and James Tardy, Esq. of Dublin, and Dr Macgee of Belfast. 
And his best thanks are due to William Bean, Esq. of Scarborough. 
Edinburgh, 
'25th November 1827. 
ERRATA. 
Plate I. Fig. 5, Section of Dentalium labiatum. 
Fig. 10, for tracliiformisj read tracheiformis. 
For Fig. 41, read 14. 
Fig. 38, 39,Jor oblongum, read oblonga. 
Fig. 3^, for heterocliticus, read heteroclitus. 
Plate II. Fig. 4,Jor contortus, read contorta. 
Plate V. Fig. 17, Cineras vittata. 
Plate VI. Fig 9, iO,for Balanus Scoticus, read Balanus candidus. 
Plate VII. Fig. 5 and 6,* Operculum of Balanus punctatus. 
Fig. 9, Balanus Cranchii. 
Fig. 22, Balanus Scoticus. 
Fig. 23, Balanus costatus, var. 
Fig, 24, 25, 26, Acasta Montagui. 
Fig. 27, 29, for caryophvllia, read caryopliyllica. 
Plate IX. for fig. 6, read Hg. 16. 
Plate XIX. Fig 2, 3, 4, for Cytheria, read Cytherea. 
Plate XX. Fig 15,* Clausina cassina. 
Fig. 16,* Clausina verrucosa. 
Fig. 1 7, inside of Laseea rubra. 
Plate XXII. Fig. 4, for tenuis, read tenue. 
Plate XXXII. Fig. 3 and 4, for glabris, read glaber. 
Plate XXXVI. Fig. 14, 15, 16, 20, for Sypho, read Sipho. 
Fig. 14, 15, 16, for striata, read striatus. 
Fig. 20, for radiata, read radiatus. 
Plate XXXVIII. Fig. 39, 40, BuUa lima — A new species. Found by Stewart Ker, Esq. 
at Greenock. 
Plate XLIII. for second fig. 9, read 7. 
Fig. 21, Neritoides littoralis. 
Plate XLIV. for lower fig. 7, read 10 as in plate. 
Plate XV. Fig. 27, 28, Trochus exiguus, Monl. Test. Brit p. 277. 
Plate LII. Fig. 20, inside of Orthocera recta. 
Fig- 22,_/or similitua, read ssemiletua. 
