452 Miscellaneous. 



Researches on the Structure, Organization, and Classification of the 

 Fossil Reptilia. — Part IX. Section 3. On Diademodon. By 

 H. G. Seeley, F.K.S. 



The author describes fragments of jaws and teeth from Upper 

 Karroo strata at Wonderboom and Aliwal Xorth, collected bj' R. D. 

 Kanuemeyer and Alfred Brown. They may possibly belong to 

 more than one genus ; but, in absence of sufficient knowledge of the 

 .skull to establish differences, the four species are referred to a new 

 genus, Diademodon. Its hinder molar teeth have undivided roots, 

 and low crowns, which are subquadrate or transversely ovate, sur- 

 rounded by a diadem of low cusps, which are chiefly developed on 

 the external and internal borders, with crenulations or minute cusps 

 on the anterior and posterior margins of these teeth. There is a low 

 central cusp in the middle of the crown from which slight ridges 

 extend, chiefly in the transverse direction ; but in the type species 

 these ridges take the form of a cross. The species are distinguished 

 by the form of the crown and the details of the cusps. The upper 

 and lower teeth are opposed so as to be evenly worn, but the man- 

 dibular teeth are narrower. 



These teeth are highly specialized, but distinct in plan from 

 Tritijlodon, and from all known Reptiles. They closely approximate 

 to some of the higher Mammalia. The author refers Diademodon 

 to a division of the Theriodonlia in whith the teeth become worn 

 with use, which is named Gomphodontia. — From the Proctedings 

 of the Royal Societij. (Communicated by the Author.) 



Preliminary Diaynosis of a new Gazelle from Algeria. 

 By Oldfield Thomas. 



The type specimen of tlie following species has been brought from 

 Algeria by Sir Edmund Loder, and generously presented by him 

 to the National Museum. 



Gazella Loderl, sp. n. 



Size small ; general colour very pale sandy, the various gazelle- 

 markings all nearly obsolete. Ears long, whitish. Hoofs narrow 

 and very much elongated. Horns long, very .slender, lyrate, Avidcly 

 divergent above. 



Hind foot, without hoofs, (c.) 2SU millim, ; length of fore hoof 

 (54, of hind one 50 ; basal length of skull 173 ; horns round curves 

 330, circumference at base 95. 



Hab. Sand-dunes of Le Souf, about 100 miles south of Biskra. 



