So who's on it?
The last thoracic vertebrae and first two dorsal vertebrae from Basilosaurus cetoides, an Eocene stem-cetacean. As I discussed here, the vertebral count from a smaller relative suggests that B. cetoides was even larger and more ridiculously elongated than previously imagined. I'd love to see how these big, extreme vertebrae worked.
Mesoplodon densirostris - I've written quite a lot of posts about beaked whales so a representative is obligatory.
The cirroctopod Opisthoteuthis is the closest an organism has come to resembling a plush animal. They're frequently mentioned in my numerous cephalopod posts. I can't talk about the fish, just some poeciliid of no consequence.
No, it isn't an exogorth, this is an amphibian known as a caecilian. They're the most poorly known major tetrapod clade and their relation to other lissamphibians still seems up for debate. The structure located between the rudimentary eye and the nostril is a sensory tentacle. I have yet to seriously discuss them.
Softshell turtles (Trionychidae) are highly derived cryptodires which traded in a bulky carapace for their titular comparably strong and flexible shell. I've mentioned them here.