1 8 BAT-TRIBE. 



they differ chiefly in the presence of the small tubercle at 

 the basal interspace of the exterior prisms ; a difference 

 which M. de Blainville regards as ground for doubting the 

 legitimacy of their approximation to the Cheiropterous order 

 at all.* Since, however, an anatomist so familiar by his 

 recent researches with all the modifications of the teeth of 

 the Mammalia had been unable to refer the fossil molars in 

 question to any of the terrestrial or aquatic genera of 

 Insectivora, but had given the figures of these molars a 

 place in the plate illustrating the ancient Vespertiliones in 

 his great work, the " Osteographie," I deduced from that 

 fact, when preparing my Report on Fossil Mammalia for 

 the British Association, additional confidence in my original 

 determination. 



An extinct genus, new to science, of a Mole-like Insec- 

 tivore, has lately come under my notice, in which the grind- 

 ing teeth present the above described peculiar character 

 of the minute tubercle at the basal interspace of the two 

 exterior prismatic cusps. They are not, in other respects, 

 identical, and additional fossils from the Kyson sand will 

 be required to establish . even the generic identity of the 

 present small teeth from that formation, with the Palseo- 

 spalax of the lacustrine beds at Ostend. 



* Osteographie des Cheiropteres, p. 93, pi. xv. fig. ix. 



