Murrayonida

The Murrayonida are an order of sea sponges in the subclass Calcinea. 
Taxonomy.
The order consists of four known species, in three families: 
Family Murrayonidae 
Family Lelapiellidae 
Family Paramurrayonidae 
Description.
Murrayonida are distinguished from other Calcinea by having a reinforced skeleton; like another line of Calcinea, the Leucettidae, but unlike most other Calcinea, the Murrayonida sponges also have a cortex covering the cormus and a leuconoid aquiferous system. 