ox TWO AFllICAJSr ANTELOPES. 537 



Plate LXXIII. 



J?'ig. 1. Adeonellopsis crosslawU, sp. ii. X 250. Showing an ovarium in the 

 distal end of the zocecium. From Wasin. 



2. Do. do. X 250. Showing- round body under the operculum 



with the protoplasmic tlu-eads to the buds below. 



3. Adeonella platalea Busk. X 150. Showing the earl.y stage of the ovicel- 



lular sac (s.) near the distal end containing the 

 embryo {einb.). From Wasin (501). 



4. Do. do. X 85. Section showing the ovicellularzooecium nearly 



filled up by the embryo, with an ovarium [ovar.) 

 now proximal to the embryo. Froin Wasin (501). 



5. Do. do. X 150. Section of embryo showing the zorecial wall 



{z.w.), the ovicellular sac (s.), and the embryo 

 (emb.). The muscles are seen at the distal end on 

 the right in the zooecial chamber. From Wasin (501 ) . 



6. Arleonellopsis crosslandi, sp. n. X 250. Thick section of embryo 



showing the aboral end. Fig. Qa, X 250. Diagram- 

 matic outline of vertical section. 



7. Do. do. X 85. Operculum. 



8. AdeoneUa platalea Busk. X 85. Operculum. 



9. Osthimosia zansibariensis, sp. n. X 85. Operculum. 



10. Lepralia tnrrita Sm. X 85. Operculum. 



11. Holoporella albirostris Sm. X 85. Polypide showing the long oral 



glands. 



12. Adeonellopsis crosslandi, sp. n. X 25. 



13. Do. do. X 50. Transverse decalcified section showing the 



opposite zooecia at about the same stage of develop- 

 ment. 



14. Do. do. Natural size. 



15. Osthimosia samibariensis, sp. n. X 50. 



16. Scliizoporella nivea Busk. X 50. The two zooecia figured were near 



together but not in the same row, and are placed 

 together to save space. A sac-like structure (so.) is 

 shown at the base of each ovicell (oe.), but of the 

 numerous muscles in this sac only about half of 

 those in focus are drawn. It seems that the ovum 

 (oc.) passes into this sac which is then ruptured (r.), 

 and the ovum is pressed forward into the ovicell 

 where it segments. The small oral glands are 

 shown {gh). 



35. Notes on Albinism in the Common Reedbuck {Cervi- 

 capra arundinum), and on the Habits and Greo(]jraphical 

 Distribution o£ Sharpe's Steenbuck (^RajMceros sharpei). 

 By Major J. Stevenson-Hamilton, C.M.Z.S,, Game- 

 Warden of the Transvaal. 



[Received April 8, 1913 : Read April 22, 1913.] 



Index. Page 



Cervicapra arundinum 537 



Raphiceros sharpei 539 



Albinism hi the Common Reedhuch (Cervicapra arundinum). 



During the early weeks of 1911 a rumour reached me of three 

 white Reedbucks having been seen near the south-western border 

 of the SaV)i Game Reserve. I gave orders that they should be 



