IV 



' Page 



The SECRETARY. Report on the Additions to the Society's 



Menagerie during the month of Octobei', 1917 336 



Mr. R, I. PooocK, F.R.S., F.L.S., F.Z.S., Curator of 

 Mammals. Exhibition of the head of a castrated 

 Bushbuck, and of three successive pairs of antlers of 

 an adult Pere David's Deer 337 



Prof. J. P. Hill, D.Sc, F.R.S., F.Z.S. Lantern exhibition 

 of new-born Marsupials, with an account of the mode 

 of parturition and extei-nal characters 337 



PAPEES. 



12. Note on a Hermaphrodite Dogfish. By Ruth 0. 



Bamber, M.Sc. (Plates I. & II.) 217 



13. On the Use of the Names Plesiosaioria and Sauro- 



2Jterygia. By G. A. Boulenger, F.R.S., F.Z.S 221 



14. Some Additions to the known Dragonfly Fauna of 



Borneo, with an Account of new Species of the Genus 

 Ckdiccia. By F. F. Laidlaw, M.A., F.Z.S. (Text- 

 figures 1-10.) 223 



15. Notes on a Collection of Heterocera made by Mr. W. 



Feather in British East Africa, 1911-13. By Lt.- 



Col. J. M. Fawcett. (Plate I.) 233 



16. Deformity of Os penis in a Seal {Phoca caspica Nilsson). 



By Sergius ALPHihiAKY. (Text-figure 1.) 251 



17. Some Observations upon Concealment by the apparent 



Disruption of Surface in a Plane at Right Angles 

 to the Surface. By J. C. Mottram, M.B. (Lond.). 

 (Text-figures 1-4.) 253 



18. New South- American Rhopalocera. By J. J. Joicey, 



F.L.S., F.Z.S., F.E.S., and G. Talbot, F.E.S. 

 (Plate I.) 259 



19. New South- American Arctiidte. By J. J. Joicey, 



F.L.S., F.Z.S., F.E.S., and G. Talbot, F.E.S. 

 (Plate I) 26 



