b. J. SCOUKFlELt) ON iiRlTISH CALDOCfcKA. 6^ 



Length, ^Y ill- Kurz * seems to have had rather smaller 

 examples, for he gives the length as 0*4 m.m. He also shows 

 the tail a little more tapering towards the end, and with fewer 

 spines, than was the case in my specimens, but these points of 

 difference seem scarcely sufficient to separate the two forms. 



Eagle Pond, Snaresbrook, Essex, October, 1891. Sphagnum 

 Pool, Leyton Flats, Essex, November, 1891. 



The male is still unknown, I believe. 



Description of Plates. 



IV. 



Fig. 1. — Geriodaphnia megops. $ X 60. 

 » 2.— „ „ c^ X 60. 



„ 3.— „ „ Tail of 5 X 150. 



„ 4. — Geriodaphnia quadrangula. 5 x 90. 

 „ 5.— „ „ (^ X 90. 



„ 6.— „ „ Tail of 9 X 180. 



„ 7. — ,, „ Ditto (dorsal view to show 



inner rows of pre- anal spines — diagrammatic.) 



V. 



Fig. 1. — Daphnia hyalina. Head of 2 x 65. 

 „ 2. — Daphnia galeata. 2 x 65. 

 )j 3. — „ „ (^ X 65. 



„ 4. — Alona intermedia. $ x 110, 

 „ 5.— „ „ Tail of 2 X 250. 



„ 6. — Ghydorus ovalis. 9 X 80. 

 „ 7.— „ „ Tail of 2 X 180. 



* " Dodekas neuer Cladoceren," Sitzungberichte der kaiserlichen Ak. der 

 Wiss. — Math. Nat. classe, Band 70, Abth. 1. Vienna, 1874-5. 



