768 NEW GENERA OF MONAXONID SPONGES, 



out almost their entire length approximately cylindrical. In 

 Dendrocia, apparently, it is the auxiliary styli which both 

 core the fibres and occur dermally and interstitially, — the 

 spicules corresponding to the principal styli of Clathria being 

 altogether absent. 



In the paper above referred to (6), — in which also a cor- 

 rected description of D. pyramida is furnished, — I suggested 

 that certain species previously admitted in the genus Clathria, 

 but distinguished by their non-possession of principal megas- 

 cleres, might provisionally be referred to the genus Wilsonella 

 Carter. I would now, however, restrict the latter genus to 

 comprise only its type-species, W. australiensis. For the species 

 which I designated W. curvichela, W. dura and W. oxyphila, — ■ 

 the microscleres (isocheke) of which are not of the palmate 

 type, — a new genus is required for which I propose the name 

 Paradoryx. In this genus also, — of which P. dura may be con- 

 sidered the type, — almost certainly should be included Clathria 

 piniformis Carter (2) and Clathria elegantula Ridley and 

 Dendy. 



The species which I described under the name Wilsonella 

 conectens may be assigned provisionally to the genus Clathria. 



Genus A l l o c I A, gen. nov . 



Definition. — Desmacidonidae in which the microscleres are 

 isochelae palmatae (perhaps sometimes accompanied by toxa), 

 the skeleton is a regular reticulation of spiculo-spongin fibre 

 cored by smooth slender styli and echinated by small acan- 

 thostyli, and the dermal spicules are smooth amphistrongyla . 



Type,!, chelifera Hentschel ; the only species. 



The single species for which this genus is established has 

 been recorded by Hentschel from Western Australia (9) and 

 the Arafura Sea (10) under the generic name Spanioplon. Its 

 retention in that genus, however, is surely inadmissible, inas- 

 much as in Spanioplon fertile, the species for whose reception 

 Topsent (21) established the genus, the smooth megascleres of 

 the main skeleton are oxea, the extra-fibral smooth megascleres 

 are tylostyli occurring only interstitially, and microscleres are 

 wanting . 



Genus I s o c i o n a, gen . nov. 



Definition. — Desmacidonidae in which the microscleres are 

 isochelae palmatae (perhaps sometimes accompanied by toxa), 



