SIDINA. 
273 
many small joints, and projecting from the end of the beak ; 
lower antennae small. 
The most common British species of this genus has been 
found abundantly in the common drinking-water of Lon- 
don, supplied from the New Biverand Highgate ponds (Dr. 
Baird) . 
Bosmina longirostris, Muller, sp.— Animal very small; 
carapace rounded behind, bulging in front, and terminating 
below in a sharp point. Dr. Baird tells us that the motion 
of this curious little creature through the water is caused 
by numerous and very rapid strokes of its lower antennae. 
Bosmina Coregoni, Baird.^ — Double the size of the 
preceding; carapace rounded below; antennae fully longer 
than the whole body. 
Lochmaben Castle Loch (Sir W. Jardine, Bart.). 
The food of the Yendace. 
Subfamily Sidina, Baird . 
Furnished with six pairs of feet ; upper antennae of mode- 
rate size ; lower antennae two-branched, a row of spinous 
filaments springing from the edge of the larger branch. 
* A new species, lately described by Dr. Baird. 
T 
