Diplodocus

Diplodocus is a genus of diplodocid sauropod dinosaur whose fossils were first discovered in 1877 by S. W. Williston. The generic name, coined by Othniel Charles Marsh in 1878, is a Neo-Latin term derived from Greek (diplos) "double" and (dokos) "beam", in reference to its double-beamed chevron bones located in the underside of the tail. These bones were initially believed to be unique to Diplodocus; however, they have since then been discovered in other members of the diplodocid family and in non-diplodocid sauropods such as Mamenchisaurus. Diplodocus could grow to 27 meters (90 feet) long and grew up to 9 tonnes (10 short tons) in weight. Seismosaurus was about 36-45 meters (120-150 feet) long and grew to 50-100 tonnes.

Film
A Diplodocus by Safari LTD's Carnegie Collection is also seen in the background in the trailer sequence in the first Jurassic Park. The Mamenchisaurus in The Lost World: Jurassic Park look much more like Seismosaurus (lengthwise) instead of Mamenchisaurus.

Novella
Diplodocus is seen in the novel Jurassic Park Adventures: Survivor.

Games

 * Diplodocus was one of the many dinosaur said to have been featured in the videogame Jurassic Park: Operation Genesis. Unfortunately, Diplodocus was cut before the game's release, leaving only its name on an in-game file (maybe due to the Diplodocus's long size that might affecting it's movement in an enclosure).

Park Builder
Diplodocus is one of the dinosaurs that can be created in the game Jurassic Park III: Park Builder.

Seismosaurus is featured in Jurassic Park ///: Park Builder.

Seismosaurus is also the longest dinosaur known and the largest in the Jurassic Park franchise. For some reason though, the size of the Seismosaurus in Jurassic Park lll: Park Builder  is incorrect. It should be 45 meters instead of 40 meters.