tooth of the premolar series, and which, as we have seen, does not occur in the normal dentition of the genus Felis; on the left side of the figured jaw this additional premolar is absent. The interest that attaches to the presence of this additional premolar in our specimen, is that in an extinct genus of Felidæ, the normal number of the lower premolars was three in place of two, as in Felis. This extinct genus was named by M. Gervais Pseudælurus,* and the one species (P. quadridentatus) on which it was determined, was obtained from the miocene formation of Sansan in France; the species was previously named by De Blainville in his "Osteographie," Felis quadridentatus and F. tetraodon. Subsequently Professor Leidyt described a second species of the genus, under the name of P. intrepidus, from the Fliocene of Nebraska. Still later, I myselft described the lower jaw of a third species, P. sivalensis, from the Siwaliks of this country. It is well known that the small number of the molar series which exists in the living Felide is a highly specialized character, which is not found in the oldest carnivora, nor in many of those which are still living. The existence of an additional lower premolar in the Miocene and Pliocene genus Pseudælurus shows that that genus is less specialized than Felis, and indicates that the former was probably the line through which the latter was described from some primitive carnivore in which the whole four of the typical premolar series were developed. The occasional occurrence of the ante-penultimate lower premolar in Felis must be regarded as an instance of "reversion" towards the genus Pseudælurus. *"Zoologie et Paléontologie Françaises", Vol. I, p. 127. III.-Record of the Occurrence of Earthquakes in Assam No reports reached from Goálpára, Nowgong, Lakhimpur, Kámrúp, Barpetá. Goálpára, Goálpára. 11.50 P. M. 12.8 P. M. No reports reached from Gauháti, Darrang, Nowgong, Sibságar, Goálpára, Goálpára. Gáro Hills, Túrá. 10 P. M. No reports reached from Kámrúp, Darrang, Nowgong, | Khasi Hills, Shillong. March | 3.33 P. M. | 5 A. M. No reports reached from Goálpára, Kámrúp, Darrang, Nowgong, 15th March. 29th April. | Khasi Hills, Shillong. No reports reached from Goálpára, Kámrúp, Darrang, Nowgong, | Khasi Hills, Shillong. April | 10 P. M. No reports received from Goálpára, Kámrúp, Darrang, Nowgong, No reports received from Goálpára, Sibságar, Lakhimpur, Khasi Hills, Shillong. 10.10 P. M. 10.35 P. M. during 1877. Communicated by COL. R. H. KEATINGE, Chief Commissioner. Sibságar, Sylhet, Cachár, Nága Hills, Gáro and Khasi Hills. Lakhimpur, Sylhet, Cachár, Nága Hills, Gáro and Khási Hills. Sibságar, Lakhimpur, Sylhet, Cachár, Nága and Khasi Hills. 1877. Sibságar, Lakhimpur, Sylhet, Cachár, Nága Hills, and Gáro Hills. 5 seconds. | No damage. Sibságar, Lakhimpur, Sylhet, Cachár, Nága and Gáro Hills. 1877. Sibságar, Lakhimpur, Sylhet, Cachár, Nága Hills and Gáro Hills. 1877. 12 seconds. 45 seconds. 10 to 12 seconds. 5 seconds, No damage. No damage. Two distinct shocks. Severe and very marked. No damage. Declared by Deputy Commissioner to be the severest felt since the great one in September 1875. The shocks were not preceded by the usual rumbling noise and were not quick and jerky, but long and undulating No damage. One sharp shock. Sylhet, Cachár, Nága Hills and Gáro Hills. 30 seconds. 6 to 8 seconds. No damage. No damage. Two clear distinct shocks at intervals of 3 to 4 seconds between the two shocks. Very marked, but not severe; not preceded by the usual rumbling noise. |