19. Minaciy amongst the Blattidas ; with a Revision of the 



(irenus Pro.soplecta Sauss., and the Description of a new 

 (ienus. By Robert Shelford, M.A., F.Z.S. (PI. 

 XLVIII. and Text-figs. 42-46.) 358 



20. On the Pairing of Pseudoscorpiones. By H. WALiiis 



Kew, F.Z.8. (Text-figs. 47-5(1.) ." 376 



21. A Contribution towards the Knowledge of the Spiders 



and other Arachnids of Switzerland. By the Rev. O. 

 Pickard-Cambridge, M.A., F.R.S., C.IVI.Z.S. (Text- 

 tigs. 51 & 52.) 393 



22. (Jn the Blood-pai'a.sites found in Animals in the 



Zoological Garden.s during the four years 1908-1911. 

 By H. G. Plimmer, F.R.S., F.Z.S., Pres.R.M.S., 

 Pathologist to the Society. (Pis. XLIX.-LV.) 408 



23. On the Structure of the Internal Ear and the Relations 



of the Basicranial Nerves in Dicynodon^ and on the 

 Homcflogv of the Mammalian Auditory Ossicles. By 

 R. Broom, M.D., D.Sc, C.iM.Z.S. "(PI. LVI. and 

 Text-fig. 53.) 419 



24. Zoological Results of the Third Tanganyika Ex})edition 



conducted by Dr. W. A. Cunnington, 1904-1905. 

 Report on some larval and young stages of Prawns 

 from Lake Tanganyika. By Prof. G. 0. Sars, C.M.Z.S. 

 (Pis. LVII.-LX.) 426 



25. The Classification, Morphology, and Evolution of 



the Echinoidea Holectypoida. By Herbert L. 

 Hawkins, M.Sc, F.G.S. ; Lecturer in Geology, Uni- 

 versity College, Reading. (Text-figs. 54-60.) 440 



Alphabetical List of Contiib utors i x 



New Generic Terms ■ x vi 



Judex of Scientific Names xvii 



Index of Illustrations , xxix 



