IV INTRODUCTION. 



favourable for dredging : notwithstanding, several specis 

 were added to the Fauna. 



It was not until 1904 that Dr. Norman determined to 

 include the Freshwater Crustacea, which had been almost 

 entirely neglected in the two counties. The result of nearly 

 two months' collecting in that year was not what might have 

 been expected. The streams which, coming from Exmoor 

 and Dartmoor, empty themselves on the north coast, run too 

 rapidly down their rocky beds to harbour Entomostraca. 

 There are no large lakes where Ilolopedmm, Bythotrephes, 

 Leptodora, &c. might be expected, and very few pieces of 

 water of any size. Moreover, he was greatly surprised at 

 not finding on the northern half of Dartmoor any such 

 peaty water as is the favourite habitat of certain species, as 

 Acantholeleris curvirostris, Alonopsis elongata, &c. 



In 1905 another search for Freshwater Entomostraca was 

 attempted in S.E. Devon, but was frustrated by illness. In 

 that year Mr. Rupert Vallentin, to whom we are greatly 

 indebted, came to our aid by making and sending to us 

 gatherings from places in South Cornwall. Much, however, 

 remains to be done in fresh-water. 



The following is a list of the occasions on which Dr. Norman 



O 



has visited Devon and Cornwall on Natural History expe- 

 ditions : 



1852. Budleigh Salterton. 



1853. Falmouth and Penzance. 

 1875. Torquay, Dartmouth, Salcombe. 

 1884. Starcross, Falmouth. 



1889. Plymouth. 



1903. May : Fowey. Padstow, Scilly Isles. 



1903. Aug. 7 to Sept. 1C : Plymouth, Salcombe. 



1904. May 9 to June 30 : North Devon coast, but chiefly 



inland through Northern Dartmoor, &c. ; sub- 

 sequently a little dredging at Exmouth and Dart- 

 mouth. 



