CALCAREOUS SPONGES, 759 



Genus 23. Grantia Fleming [1828] (emend.). 



Diagnosis. Canal system syconoicl. Colossal longitudinal oxea, 

 if present, projecting from the surface. Tulwar skeleton 

 articulate, composed of I'adiate spicules, which may or may 

 not be supplemented by oxea. 



For illustrations of this genus see Dendy [1893 AJ. 



It has been conclusively shown by Minchin [1896] that the 

 type species of the genus Grantia is G. co^njjressa, and that the 

 name Grantia must always be given to the group of species 

 associated with G. conipressa. We have already pointed out that 

 this species has a definite, though slight, dermal cortex, and 

 that its true position is in the present family, and in fact, in the 

 genus Grantia as defined by Dendy in 1892. 



We may point out that G. intermedia Thacker stands alone in 

 the genus, as far as is at present known, in the presence of apical 

 rays on the tangential cortical radiates, and although we do not 

 attach much importance to such spicules, we feel that their 

 presence in this species indicates at any rate a possible starting 

 point for the family Amphoriscidse. 



We recognise the following species as belonging to this 

 genus : — 



Section A. With large, usually radially arranged oxea, 

 but without microxea. 



1. G. ATLANTICA Ridley. 



Grantia atlantica Ridley [1881]. 



2. G. BREViPiLis Haechel. 



Sycandra capillosa var. hrevipilis Haeckel [1872]. 



3. G. CANADENSIS Lamhe. 



Grantia canadensis Lambe [1896]. 



4. G. CAPILLOSA 0. Schmidt. 



Ute capillosa O. Schmidt [1862]. 

 Sycandra capillosa Haeckel [1872]. 



5. G. CHAETACEA Jenkin. 



Dermatreton chartaceum Jenkin [1908 B]. 



6. G. CLAviGERA 0. Schmidt. 



Sycimda clavigera O. Schmidt [1870]. 

 Sycandra clavigera {Sycandra compressa var. clavigera) 

 Haeckel [1872]. 



7. G. coMOXENSis Lambe. 



Grantia comoxensis Lambe [1893]. 



