16 



coleopterous Insects as arc any of the insectivorous multicuspid molars of the Bats and 

 Shrews. The existence of the wing-covers of Insects in the Oolitic slate of Stoncsfield has 

 been Long known ; many of them approach most nearly to those of a Buprestis, a genus 

 now best represented in warm climates. 



In the present jaw the condyloid and coronoid processes are wanting, but have left their 

 impressions on the matrix ; there is the same wide and shallow groove near the lower 

 margin of the hind part of the ramus, and the same notch at the symphysis, as in Amphithe- 

 Hum PrevosHi and in Myrmecohius. 



The chief value of the present specimen arises out of the very perfect state of the crowns 

 of the molar teeth (fig. 25, b). If the structure they exhibit be really the same with that 

 of the teeth of the Amphithcrium Prevosfii, yet they differ in number, there being but five 

 instead of six premolars. The York jaw also differs in size to a greater degree than has 

 been observed in mature individuals of the same species of Insectivorous Mammal in a 

 state of nature. 



I referred this jaw, therefore, to a distinct species, dedicated to my lamented friend 

 the accomplished naturalist and scholar, William John Broderip, F.R.S. It probably, 

 indeed, indicates a distinct genus, for which, if confirmed, the name Amphikstes might be 

 appropriated. 



§ IV. Genus — Phascolotiierium, Owen, 1839. 1 

 S/jecies 1. — Phascolotiierium Bucklandi, Owen? Plate I, figs. 26, 26a. 



Didelpiiys Bucklandi, Broderip, 1828. Zoological Journal, vol. iii, p. 408, pi. xl. 



This genus and species are founded on the right half or ramus of a lower jaw 

 imbedded in a slab of Stonesfield slate, and presenting the inner side to view. The 

 natural size is shown, in outline, in PI. I, fig. 26 ; and a carefully finished view of the 

 specimen, twice the natural size, is given in fig. 26a. 



The teeth, in situ, include three incisors, a canine, and seven molars ; it is open to 

 conjecture that a fourth incisor may have projected near the symphysis. 



The incisors in place have long slender crowns, divided by interspaces rather exceed- 

 ing the breadth of the tooth. A similar interval divides the hind incisor from the 

 canine (c). This tooth (c) is longer, larger, and rises almost vertically with a slight 

 backward curve of the crown. The incisors incline more forward as they recede in 

 position from the canine. 



An interval of twice the breadth of the canine divides that tooth from the first of the 

 molary series. The first molar (l) is divided by a space of about half the breadth of the 

 crown from the second (2), w r hich, with the rest of the seven molars, are nearly or quite in 

 contact with each other. 



1 1 Geological Transactions,' 2nd series, vol. vi, p. 58, pi. vi. 2 Ibid. 



