102 BRANCHIOPODA. 



Sars has named eleven Norwegian varieties of this species ; 

 o these aquilina, caudata, and rosea have been regarded by 

 some authors as distinct species. It is also D. paludicola 

 and ventricosa of Hellich, and D. Hellichii of Stengelin. 



Slapton Lea, and large pond at Torcross ; lake at Tresco, 

 Scilly Isles (A. M. N.} ; old well near St. Ives, and Looe 

 Pool, near Penzance (R. Vallentin !). 



SIMOSA VETULA (0. F. Miiller). 



1850. Daphnia vetula, Baird, p. 95, pi. x. figs. 1, 1 a. 



1900. Simocephalus vetulus, Lilljeborg, p. 166, pi. xxiv. figs. 8-18, 



pi. xxv. figs. 1-7. 

 1903. Simosa vetula, Norman, " New Generic names for some Ento- 



mostraca and Cirripedia," Ann. & Mag. Nat. Hist. ser. 7, vol. xi. 



p. 367. 



Even more common than Daphina pulex. Norman, in the 

 paper referred to, substituted the generic name Simosa 

 for Simoceplialus, Schodler (not of Giinther, a genus of 

 Snakes). 



CEKIODAPHNIA RETICULATA (Jurine). 



1895. Ceriodaphnia reticulata, Th. Scott, Thirteenth Ann. Rep. Fish. 



Board Scotland, p. 255, pi. x. fig. 10. 

 1900. Ceriodaphnia reticulata, Lilljeborg, p. 184, pi. xxvii. figs. 1-10. 



This is not Daphnia reticulata, Baird. Lilljeborg refers 

 that author's pi. vii. fig. 5 to Ceriodaphnia megalops of Sars, 

 and pi. xii. figs. 1, 2 to Ceriodaphnia laticaudata of P. E. 

 Miiller. 



The present species is distinguished from all others of the 

 genus bv the caudal claws, which bear a series of small 

 spines on their inner margin. 



The Axe at Axminster (A. M. N.) ; ponds on the Lizard 

 (R. Vallentin I). 



CERIODAPHNIA LATICAUDATA, P. E. Miiller. 



1850. Daphnia reticulata, Baird, p. 97 (partim), pi. xii. figs. 1, 2. 

 1867. Ceriodaphnia laticaudata, P. E. Miiller, " Danmarks Clado- 



cera," Naturhist. Tidssk. ser. 3, vol. v. p. 130, pi. i. fig. 19. 

 1895. Ceriodaphnia laticaudata, Th. Scott, Thirteenth Ann. Rep. 



Fish. Board Scotland, p. 256, pi. x. figs. 11-14. 

 1900. Ceriodaphnia laticaudata, Lilljeborg, p. 298, pi. xxix. figs. 8-14. 



A pond on the Lizard, Oct. 1905 (.??. Vallentinl) ; Slap- 

 ton Lea (A.M. N.). 



