Zoology 77 



perhaps those of the very local Limnophilus decipiens and of Agraylea 

 pallidula, which were found in the Fen by M. E. Mosely in 1926: the 

 last-named had only been taken once previously in Britain. Some 63 

 species representing 1 1 families have so far been found, but there is much 

 scope for futher work on this order. 



MYRIAPODA 



According to E. B. Worthington, 28 species have been found in Cam- 

 bridgeshire, and those requiring special mention include Glomeris marginata 

 and Polyxeims lagnrus. The last-named has been found in damp timbers 

 around Cambridgeshire and Wicken. The difficulties attending their 

 identification and the paucity of reference collections probably accotmt 

 for the scanty attention given to the "myriapods" in Britain. 



CRUSTACEA' 



Considering that Cambridgeshire is so essentially an inland county, its 

 crustacean fauna is truly remarkable. This is represented by no less than 

 76 genera and 166 species. Quite recendy, the fauna of Wicken Fen has 

 been investigated fairly thoroughly, but previously to that a great deal of 

 work had been done by Brady and Robertson as early as 1870. Wicken of 

 course represents a part of the original Fenland and possesses its own 

 interesting fauna. There is also the remains of an interesting salt marsh 

 with brackish water fauna to be found at Wisbech. 



Among the higher Crustacea are records of Carcinus maenas (Pennant) 

 and Palaeomonetes varians (Leach). Chirocephalus diaphanus Baird is also 

 recorded from Bottisham Park, while there are several records ofNiphargus 

 or the blind well-shrimp, though it is quite certain that several of Gilbert 

 White's records of the spring keeper refer to Niphargus and not to Gam- 

 mams. The higher Crustacea, with the addition of Chirocephalus and 

 Argulus, are represented by 18 genera and 34 species. 



The Cladocera are represented by 21 genera and 40 species. Most of 

 them come from Wicken Fen, and a few of these are rare or of exceptional 

 interest. Macrothrix hirsutkomis Brady and Norman, recorded by W. A. 

 Cunnington, is a rare species, and so are Acroperus angnstatus Sars and 

 Alona temiicaudis Sars, both recorded from Wicken Fen by P. M. Jenkin. 

 Anchistropus emarginatus Sars, recorded by A. G. Lowndes from Wicken 

 Fen, was at one time considered the rarest species of Cladocera in the 

 British Isles, but it is reaUy fairly common. Polyphemus pedicuhis L. is 

 very abundant on Wicken Fen, but it does not occur in many of the 

 midland counties. 



' By A. G. Lowndes, M.A. 



