tsalmoth
"Tsalmoth maintains though none knows how".
"Loiosh woke up with a start, looked around, and jumped down from my
shoulder. He bagan working on the remains of my tsalmoth ribs"
The Book of Jhereg, Jhereg, Chapter 6, page 50
Which I thought would help, but doesn't. Internet mentions turtles
having ribs and snail shells having ribs.
jhegaala
"Jhegaala shifts as moments pass"
"I thought for a minute. Jhegaala eggs? No, she'd made that yesterday."
The Book of Jhereg, Jhereg, Chapter 10, page 87