On Mammah from the Upper Congo. 465 



suggested iu the case of Sfuklmannia * that the thickened 

 plug-like end of the spermatophore is derived from the 

 spermiducal glands of the other worm. I think that in the 

 present case a similar explanation may be applicahle, and 

 that this substance may be either a product of the spermi- 

 ducal glands or a mucoid secretion of the skin of the clitellar 

 region, and that it may serve a useful purpose in retaining 

 the recently-injected sperm within the spermatheca, until it 

 is stored in the special pockets provided for it, and also as a 

 plug for the completed spermatophore. 



My thanks are due to my friend and colleague, Dr. W. T. 

 Caiman, for some useful suggestions and criticisms while 

 working at the subject of this paper. 



LYI. — JJst of Mamtnals {exclusive of Ungulata) collected 

 on the Upper Congo hg Dr. Christy for the Congo Museum, 

 lervueren. By Oldfield Thomas^ F.R.S. 



(Published b}' permission of the Trustees of the British Museum.) 



In the ' Annals ' for last August f I published a few of the 

 more striking novelties from the fine series of Mammalia 

 brought home from the Congo by Dr. C'uthbert Christy, 

 who iiad been employed by the Congo Museum to make a 

 collection for them on the Ituri and Welle, and, by request of 

 the Belgian authorities, I now give a list of all the species 

 obtained by him, with the exception of the Ungulates. 



Such a list is always valuable for zoo-geographical 

 reasons, and Dr. Christy's fine collection so supplements 

 those made in the same region by Emin Pasha, the 

 Alexander-Gosling Expedition, and the members of the 

 Ruweiizori Expedition, as to make the complete list a very 

 long one. 



In a general way, there is a great uniformity in the 

 Mammal life from the Cameroons to Uganda, as might be 

 expected from the uniform nature of the country, but in a 

 few cases there is enough local difference to authorise the 

 distinction of special subspecies for the Upper Congo forms. 



In all, Dr. Christy's collection contains 74 species and 

 subspecies, of which 10 have proved to need description 



* P. Z. S. 1901, i. p. 351. 



t Ann. & Mag. N. H. (8) xvi. p. 146 (1915). 



Ann. (& Mag. jS\ Hist. Ser. 8. Vol. xvi. 33 



