I agree with Urico's stellar vault - but just wanted to post these references I found - I was interested in the term so investigated a bit. There are a few diagrams in these sites.

HTH

Sheila

http://www.lookingatbuildings.org.uk/default.asp?Document=2....

The glossary Rib-vault
Glossary A-ZGlossary terms
A vault with a masonry framework of intersecting arches (ribs) supporting cells, used in Gothic and late Norman architecture. A wall rib or wall arch spans between wall and cell vault. A transverse rib spans between two walls to divide a vault into bays. In a quadripartite rib-vault, each bay has two pairs of diagonal ribs dividing the vault into four triangular cells. A sexpartite rib-vault, usually set over paired bays, has an extra pair of ribs springing from between the bays. More elaborate vaults may include ridge-ribs along the crown of a vault or bisecting the bays; tiercerons, extra decorative ribs springing from the corners of a bay; and liernes, short decorative ribs in the crown of a vault, not linked to any springing point. A stellar or star-vault has liernes in star formation. A fan-vault is a form of vault used after c. 1350, made up of halved concave masonry cones decorated with blind tracery.


With liernes (short decorative ribs not linked to any springing point) in star formation. Also called a stellar vault.


http://www.lookingatbuildings.org.uk/default.asp?Document=2....


http://www.uib.es/secc6/slg/gt/term_imatges/art/68.html

Picture of a volta de creueria

http://www.uib.es/secc6/slg/gt/term_imatges/art/71.html

Picture of a volta estrellada