266 Geological Society. 



seating premolars so like those of the Mesozoie genus Plagiaulax as 

 to have suggested the above name, while the true molars in the 

 upper jaw resembled those of his South-African genus Tritylodon 

 even more nearly than those of Microlestes and Stereognathus, with 

 which the latter were compared. The lower molars of Neopla- 

 giaulax have only two, instead of three, longitudinal series of tuber- 

 cles : and the author suggested that this may have been the case 

 also in Tritylodon ; and that the detached molars, on which the genus 

 Microlestes is founded, may also belong to the lower jaw. 



2. " On the Discovery in one of the Eone-caves of Creswell 

 Crags of a portion of the Upper Jaw of Elephas primigetoius, con- 

 taining, in situ, the first and second Milk-molars (right side)." By 

 A. T. Metcalfe, Esq., F.G.S. 



The specimen exhibited to the Society and now described was 

 obtained from one of the Creswell bone-caves before the commence- 

 ment of their systematic exploration by a Committee of the British 

 Association. The bone-caves are in the Lower Magnesian Lime- 

 stone of the Permian, not far from the southern limit of that deposit 

 near Nottingham. The locality was described, and it was shown that 

 the ravine in which the caves occur has been cut in the limestone 

 by the little river Wollen, which probably began by excavating a 

 cavern the whole length of the ravine. The roof of this cavern 

 must have fallen in, and the minor lateral caverns, in which bone- 

 deposits are found, are now similarly being converted into side 

 ravines. 



The fossil was found in " Pin-Hole Cave," the most westerly on 

 the north or Derbyshire side of the ravine, about 6 inches below 

 the base of the surface-soil, here 4 inches deep. The cave has been 

 described in the Society's Journal (vol. xxxi. p. 679), by Bev. J. M. 

 Mello, who in 187-j obtained from this spot bones of the Arctic 

 fox (Canis lagopus). As the particular mammoth teeth (first and 

 second milk- molars of the upper jaw) occurring in the fossil were 

 wanting in the National Collection, the author has undertaken to 

 present the specimen to the British (Natural History) Museum. 



3. " Notes on the Remains of Elephas prirntgenius from the 

 Creswell Bone-cave." By Sir B. Owen, K.C.B., F.R.S., F.G.S., &c. 



The author noticed the various descriptions by Cuvier and himself 

 of milk-molars of Eleplias primigenius, and pointed out that all 

 hitherto known were found detached. The present is the first 

 known occurrence of the two earliest milk-molars in situ. The 

 specimen discovered by Mr. Metcalfe is a portion of the fore part 

 of the maxilla of a very young Elephant with the teeth of the right 

 side preserved, the corresponding teeth of the left side and their 

 sockets having been broken awa}\ Of the two teeth thus obtained 

 descriptions and measurements were given. The first tooth is much 

 worn, but only the anterior portion of the second has undergone 



