JOUENAL 



OF THE 



ROYAL mOROSOOPIOAL SOCIETY. 



DECEMBER 1883. 



TEANSACTIONS OF THE SOCIETY. 



XIII. — On some new Cladocera of the English Lakes. 

 By CoNEAD Beck. 



(Bead 13th June, 1883.) 

 Plates XL and XII. 



In the summer of 1881 I found, whilst dredging in some of the 

 English lakes, three species of Cladocera previously unknown to 

 England. Prof. E. Eay Lankester was good enough to draw 

 attention to this in the ' Annals and Magazine of Natural History ' 

 (ix. 1882, p. 53). Although these species have heen described by 

 foreign authors, no account of them has yet appeared in English, 

 so I think that a short notice of them may be useful to those 

 interested in the subject. 



EXPLANATION OF PLATES XL and XIL 



Plate XL Holopediura gibberum. 



Fig. 1. — Lateral view. Fig. 6. — Second foot. 

 „ 2. — First antenna. „ 7. — Third „ 



„ 3.— Mandible. „ 8.— Fourth „ 



„ 4.— Maxilla. „ 9.— Fifth „ 



„ 5.— First foot. „ 10.— Sixth „ 



Plate XII. Bythotrephes CederstrSmii. 



Fig. 1. — Lateral view. Fig. 5.— First foot. 



„ 2. — First antenna. „ 6. — Second „ 



„ 3.— Second „ „ 7. — Third „ 



„ 4.— Mandible. „ 8.— Fourth „ 



Latona setifera, 



■ Fig. 9.— Ventral view. Fig. 12. — Second antenna, 



„ 10. — Lateral „ „ 13. — Mandible. 



„ 11. — First antenna. „ 14. — Maxilla. 



Ser. 2.— Vol. III. 3 G 



