The study is based upon a proboscidean collection made from the siwalike during the project survey of vertebrate fossils of West Pakistan, 1968 â€“ 71, sponsored by the University of the Punjab. During this period, whole of the pot war and the suthimalsyas were thoroughly investigated. As a result 25 species have been identified, of these, 11species are new to science. These arel stegodon dhokewsnensis, S. sardhokensis. Gomphotherium G. intermedius. G. dialensis, synoonologhus seaborne, Tetralophodon buzdarensis, stegolophodon maluvalenals, Elephas irshadil, and E. Promaximus. Status and position of the Siwalik and some non Siwalik general and species has been reviewed and the following changes have been made.
1. Gomphotherium pendionis is excluded from gomphotherium and has been transferred to the genus synconelophus.
2. Synconelophus hasneti, which had been transferred to the genus Ansneus by chakravarti (1957), has been resurrected.
3. pentalophodon has been synonymies with the genus Ansncus and the species, pentalophodon sivalensis and P. falooneri have been incorporated as ansncus sivalensis and A. osborni nom.n. Respeotuveity.
4 primelophas has been synonymies with stegetetrabelodon.
5 Elephas plenifrens. This was synonymy with Elephas by Simpson (1945). Has been resurrected.
6 Elephas plenifrens. This was made a genetype of the genus Arohidiekedon by pohlig (1888), has been resurrected.
7 Elephas namadieus, which was made a gene type of the genus Palaeoloxodon by matsumoto (1924), has been resurrected.
The following material is being described for the first time in the following species:
1. p3 in Deinotherium pentspotsmiae.
2 Dp4 in Deinetherium indieum.
3 DP2. DP3, upper incisor and m3 in sysoonelophus ptyehedus.
4 M3 in synconolophus corrugate.
5 M1 and M3 in ansnous omborni nom.n.
Probable evolution, migration and extinction of the Siwalik forms have been disoussed. The salient features are:
1 stegodon originated in Asia probably in the Siwalik region. Stegodon bembifrens has been regarded as the most primitive species of the genus.
2 Gemphotherium angustidens is the most primitive species of the genus and G. Coopery has been regarded as its junior synonym.
3 Genus synconlolophus originated in the Siwalik region and migrated later on to other parts of Asia syncoolephus ptyohodus is the most primitives species of the genus.
4 Stegolophodon originated in the Siwalik region. It is absent in Europe and Africa. The hitherto referred material from Europe and Africa by Osborn (1942), patriarchy (1943, 1954), Bergenieuy and creosol (1955), Singer and Hooijer (1958) and Hooijer (1963) is referable to the family fliphsntidas.
5 Stegoterrabelodont stocks, which migrated to Asia, probably gave rise to platolophas and Elephas.