48 Mr. R, E. Drake- Brockman on neio Species 



separate bundles of tyles and rhapliides. Microscleres in 

 iorui of oval rings. 



Noronha scalar if or mis, sp. n. 



Sponge incrustlng. Tyles nearly straight, slender, 140 fi 

 long, 1'8 fi thick; heads oval, 5x2 fi. Rhaphides 80 ytt 

 long, very slender, tapering to hair-like extremities, straight, 

 or curved at one end. Microscleres, oval rings about 45 /j, 

 long, 30 fi broad, 3 fi thick, with keyhole sinus on inner 

 margin at each end of long axis. 



The definition of Merita itself must be emended in a future 

 paper. 



VI. — On a new Species and a new Subspecies of the Genus 

 Madoqua and a new Suh.>ipecies of the Genus Rhynchotragus. 

 By R. E. Drake-Brockman. 



Having just completed an interesting journey along the 

 western limit of the Somali country and through Abyssinia, 

 [ am able, by the help of my own collections and the material 

 in the British Museum of Natural History, to throw a little 

 more light on the distribution and local variations of several 

 of the members of the genera Madoqua and Rhynchotragus. 

 Passing from north to south through Soraaliland and Eastern 

 Abyssinia, we have as the most northerly species M. saltiana 

 and a new species of Madoqua which I have described below 

 as M. cordeauxi. South of these we soon come upon 

 M. phillipsi, with its westerly subspecies M. phillipsi harar- 

 ensis and tiie easterly or coast representative M. phillipsi 

 guhanensis. 



Still farther south of the phillipsi group we find M. erlan- 

 geri in Ennia Galla, together with a new subspecies of 

 Rhynchotragus, R. guentheri wroughtoni. 



As one travels south along the river \yeb, M. sway net is 

 ubiquitous until the junction of the rivers Ganale and Dawa, 

 when R. guentheri takes its place, and continues westward 

 towards L. Rudolf and L. Stephanie, where it is replaced by 

 R. guentheri smiihii and R. cavendishiy the largest of this 

 genus. 



Travelling in a south-easterly direction from the junction 

 of the rivers Ganale and Dawa at Dolo, we meet near the 

 coast R. kirkii, the most southerly representative of the 

 Somali dik-diks. 



