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 



