REPORT ON THE HEXACTINELLIDA. 49 



Autodermalia. — Dermalia which lie either completely, or at least with their axial cross, 



in the dermal membrane. 

 Hypodermalia. — Dermalia which lie with their tangential rays more or less closely 



beneath the dermal membrane. 

 Gastralia — All the spicules which stand in a definite relation to the gastral mem- 

 brane. 

 Autogastralia. — Gastralia which lie either completely, or at least with their axial cross, 



in the gastral membrane. 

 Hypogastralia. — Gastralia which lie with their tangential rays close beneath the gastral 



membrane. 

 Canalaria. — Spicules whose axial cross lies in the membrane which lines the eff"erent 



canals. ' 



Parenchymalia. — All spicules which are confined to the parenchyma of the soft parts, 



and which belonoj neither to the dermal nor to the gastral membrane. 

 Dictyonalia. — The parenchymalia which become fused to form the continuous skeletal 



framework of the Dictyonina. 

 Principalia. — The more or less strong parenchymalia which, in certain circumstances, 



become fused by siliceous matter, and which constitute the supporting framework 



of the Lyssacina. 

 Comitalia. — -Thin parenchymalia which are very closely apposed to the principalia. 

 Intermedia. — Parenchymalia situated between the principalia or dictyonalia. 



(ZOOL. CHALL. ESP. — PART Lin.--1886.) Ggg 



