170 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
a mile, we let down the dredge in 20 fathoms. The bottom was 
muddy sand, which, on being washed, disappeared rapidly through 
the meshes of the sieves. A second haul—in 29 fathoms—was 
disappointing, the bag coming up all but empty. Perhaps the 
most annoying circumstance in a dredger’s work is when an under- ' 
current, running contrary to that on the surface, negatives the 
hard and steady pulling at the oars. A third and last haul was 
more successful, the sand yielding, on examination, some of the 
less common Aissoe. Among the species of more particular 
interest obtained were Vucula sulcata, Bronn., Axinus croulinensis, 
Jeff., Scrobicularia prismatica (Mont.), Rissoa abyssicola, Forb., R. 
inconspicua, Ald., R. proxima, Ald., &. vitrea (Mont.), Odostomia 
Sciillee (Scac.), Plewrotoma costata (Don.), and P..brachystoma, Phil. 
What strikes every one who has had opportunity of employing 
the dredge is, as a rule, not the wealth of specimens obtained, but 
the number of species represented frequently in a day’s work. 
The dredge in the three hauls we had did not probably work over 
more than a few dozen yards of the bottom, and yet some 51 
species and varieties of Mollusca were met with. 
I desire, in closing, to express my obligations to Mr. J. T. 
Marshall, of Torquay, for subjecting the siftings obtained to a 
minute investigation, and for his kindness in determining some of 
the rarer species. The following is a complete list of what were 
obtained :— 
Anomia ephippium, L, Venus gallina, var. laminosa, 
Pecten opercularis (L.). Mont. 
Mytilus modiolus, L. Lucinopsis undata (Penn.). 
Nucula sulcata, Bronn. Psammobia ferréensis (Chem. ). 
» tenuis (Mont.). Mactra subtruncata (Da, C.). 
Montacuta bidentata (Mont.). Scrobicularia prismatica(Mont. ). 
Axinus flexuosus (Mont.). 3 nitida (Miill.). 
»  croulinensis, Jeff. a alba (Wood). 
Cardium echinatum, L. Solecurtus antiquatus (Pult.). 
»,  fasciatum, Mont. Solen pellucidus, Penn. 
5 nodosum, Turt. Thracia pretenuis (Pult.). 
» Minimum, Phil. Corbula gibba, Olivi. 
Cyprina islandica (L.). Mya truncata, L. 
Venus lincta, Pult. Saxicava rugosa (L.). 
» gallina, L. Dentalium entalis, L, 
: 
4 
: 
: 
: 
