VI 



Page 



23. On the Variation in the ISTumber of Dorsal Scale-rows 



in our British Snakes. By Miss Joan B. Procter, 

 F.Z.S. (Text-figures 1-3.) 357 



24. On the Species of Balaninus occurring in Borneo 



(Coleoptera, Ourculionidse). By Guy A. K. Mar- 

 shall, D.Sc, F.Z.S. (Plates I. & II.) 365 



25. Oa some new Fishes from near the West Coast of Lake 



Tanganyika. By G. A. Boulenger, F.R.S., F.Z.S. 

 (Text-figures 6-10.).... 399 



26. The Radula of the Mitridse. By the Hev. A. H. Cooke, 



Sc.D., F.Z.S. (Text-figures 1-18.) 405 



27. Note on the Righting Reaction in Asterina gihhosa 



Penn. By E. S. Russell, M.A., B.Sc, F.Z.S 423 



28. Experiments on Sex Determination. By Lt.-Col. S. 



MoNCKTON Copeman, M.D., F.R.S., F.L.S 433 



29. The Variations in the Digastric Muscle of the Rhesus 



Macaque and the Common Macaque. By Chas. F. 

 SoNNTAG, M.D., Ch.B., F.Z.S., Anatomist to the 

 Society. (Text-figures 1-5.) 437 



30. On the Nematode Parasites of a Chapman's Zebra. By 



Miss M. Turner, B. Sc. (Text-figures 1-6.) 441 



31. The Development of the Mesenteries in the Actinian 



Urticina crassicornis. By James F. Gemmill, M.A., 

 M.D., D.Sc. (Text-figures 1-5.) 453 



32. The Ciliation of the Leptomedusan Melicerticlium octo- 



costatum (Sars). By James F. Gemmill, M.A., M.D., 

 D.Sc. (Text-figure 6.).. 459 



Alphabetical List of Contributors vii 



Index xi 



