106 
CATALOGUE OF THE MOLLUSCA 
undatum, var. 2; Natica Aldert, Montaeur; Velutina 
levigata ; Chiton cinereus ; Nucula nucleus, tenuis; Leda 
caudata ; Modiola marmorata, NicgRA ; Cardium fasciatum ; 
Pullastra virginea ; ASTARTE comPRESSA ; Psammobia Feré- 
ensis; Syndosmya prismatica ; Mactra elliptica; NEmRA cus- 
prpata; Corbula gibba; Lyonsta Norvzartca; Cynthia tu- 
berosa, AMPULLA ; Ascidia sordida ; Molgula arenosa ; Pxr- 
LONAIA CORRUGATA. 
Derr Water Recton.—Tritonia Hombergii ; Trochus tumidus ; 
Fusus antiquus, var.; Norvecicus, Turtoni, Isuanpicus, 
gracilis, var. ; Buccinum undatum, var. 1 ; Narica Gran- 
LANDICA ; TEREBRATULA PsiTTacea ; Modiola nigra; Venus 
gallina, var. Prideauxiana; Cyprina Islandica; Astarte 
Danmonice ; Panopma Norvecica. 
Our best thanks are due to those gentlemen who have kindly 
furnished us with information for the following Catalogue ; more 
especially to the Rey. Geo. Cooper Abbes, of Cleadon ; to Mr. 
Wm. Backhouse, of Darlington; to Mr. Robert Embleton, of 
Embleton ; and to Mr. Richard Howse. 
