37,6 Prof. II. G. Seeloy 071 the Dentition of the 



Skull more llglitly built tlian in R. angolensis, but agreeing 

 with it in all essential respects, such as the very slight 

 deflection of the brain-case, the co-ossification of the pre- 

 maxillffi, and the swollen supraorbital margins. Teeth of the 

 same squarish form, but smaller throughout, and similar in 

 relative proportions, with the exception tliat the last molar, 

 both above and below, is very much smaller, about one-third 

 instead of one-half the size of the tooth immediately pre- 

 ceding it. 



Dimensions of the type (not fully adult) : — 



Forearm 70 mm. 



Head and body (c.) 112; tail 11; poUex (c. u.) 28'5 ; 

 third finger, metacarpal 49*5, first phalanx 32"5, second 

 phalanx 41 ; lower leg and hind foot (c. u.) 46. 



^SkuU : greatest length 38'5 ; zygomatic breadth 20'5; 

 supraorbital foramina to tip of nasals 18 ; breadtii of brain- 

 case 15; front of canine to back of m^ 14*8 ; p'^ 2'3x r8 ; 

 m^ 1-4 X 1-2 ; p^ 2-7 x 1-7 ; m. 1-3 x 1-1. 



I fab. Sierra Leoue. 



T^pe. Nearly adult female. B.M. 8. 9. 11. 1. Collected 

 and presented by Canon F. C. Smith. 



The many important characters by which Rousettus cingo- 

 lensis diflfers from all other members of the genus have recently 

 been brought out in Dr. K. Andersen's admirable notes on 

 the group *, so that no comparison of R. smithii with other 

 species is required. From R. angolensis it is at once distin- 

 guishable by its smaller size (allowing, o£ course, for the 

 slight immaturity of the type), smaller teeth, and, especially, 

 by its much smaller posterior molars. 



I have much pleasure in naming this Rouset after its 

 discoverer, to whom the National Museum is indebted for 

 various acceptable specimens. 



XLV. — On the Dentition of the Diastema in some Fossil 

 Reptiles referred to the Gomphodontia, from the Up-}~>er 

 Karroo Rocks of Cape Colony. By H. G. Seeley, F.K.S., 

 F.G.S., King^s College, London. 



One of the notable features in the dentition of the fossil 

 lleptilia which most closely resemble mammals is the tooth- 

 less interval in the jaws between the canine and molar teeth. 

 A similar toothless interspace is present in existing mammals, 



* Ann. & Mag. Nat. Hist. (7) xix, pp. 501 et seqq. (1907). 



