AA, BRITISH COPEPODA. 
berland, where it haunts the shallow pools which are 
scattered over a small extent of salt marsh near the 
river side: these pools, being subject to the occasional 
overflow of the tide, are, of course, brackish, and, 
towards the end of summer, swarm with microscopic 
and even larger life of various kinds. I have no doubt 
that they would well repay a more minute examination 
than I have been able to devote to them. It may be 
interesting here to note the HEntomostraca which I have 
taken in this marsh: the Copepoda are Oyclops 
equoreus, Tachidius brevicornis, Temora velox, Delavalia 
palustris, Hetinosoma (sp.), Laophonte (sp)., Platy- 
chelupus littoralis, Dactylopus tisboides, and possibly 
others of which I have not kept note; and besides 
these, the following Ostracoda occur plentifully :— 
Cythere castanea, Limnicythere inopimata, Cypris gibba, 
Loxoconcha ellptica, Cytheridea torosa. 
As regards the particular species now under con- 
sideration—Delavalia palustris—it remains to be noted 
that itis scarce in comparison with the other Copepoda 
in whose company it occurs, though a few specimens 
may almost always be found in a gathering from the 
Seaton Marsh. Though I have dissected several spe- 
cimens very carefully I have not succeeded in finding 
the lower foot-jaw; I can scarcely doubt that it really 
exists, as in other species of the genus, though perhaps 
very small. The mouth-organs of these mud-loving 
creatures are very liable to get obscured by adherent 
dirt, and difficult to recognise even after Jong-con- 
tinued maceration in solution of potash. 
