CRUSTACEANS C.pygmaeus will be found in Brady's Monograph of British Copepoda under the name of Attheyella cryptorum, and that of C. staphylinus (Jurine) under the title of ' Canthocamptus minutus, Baird.' For authorities and other useful notices about the Entomostraca in Mr. Scourfield's catalogue, his own paper on the Entomostraca of Epping Forest should be consulted. 35 For certain species the practice of washing wet mosses and wet liverworts is strongly commended. Indeed, the relations subsisting between water plants in general and these small crustaceans will be found replete with interest. Judging by recent performance the waters of Leicestershire promise well for the researches of future carcinologists. For land crustaceans they can have the glory of opening up a territory entirely unexplored. At least, when these words were first printed, such appeared to be a reasonable inference from diligent but fruitless inquiry. Now, however, the statement must be qualified in view of information, accidentally belated, which Mr. A. R. Horwood, curator of the Leicester Museum, under date 30 March, 1907, has kindly supplied. Besides noting the occurrence of the crayfish at Aylestone in the Soar, he mentions that Gammarus pulex, Oniscus ase//us, Porcellio scaber, and Armadillidium vu/gare, are all widely distributed in the county, and that he himself has found specimens of the first three quite recently at different localities. Oniscus ase//us, Linn., and the two following species, which owe their specific names to Latreille, are, among small creatures outside the class of insects, about the most familiar objects in the British fauna. Yet to the world in general it is far from familiar know- ledge that they are Crustaceans. The zealous investigator will assuredly find that of the same tribe many more species than those above named occur in Leicestershire. 34 The Essex Naturalist, x, 313-34. 107
