106 



ROYAL SOCIETY OF CANADA 



is no ground for this except u reseiiiblanee in n-enoral form. The struc- 

 tures, so far as known, are quite different. 



Note. — ThetAva) following species, having the rows of spicules diagon- 

 ally arranged, as I remarked in descril)ing them in 1889. have been 

 placed l)y Rautl'in a new genus Diagoiilella. I doubt the expediency of 

 this on the mere ground of divergence of the rows of meshes from 

 horizontality. But there are other peculiarities of these species, which 

 might fairly entitle them to constitute distinct sections of the genus. I 

 therefore, place them by themse^lvcs. noting these differences : 



5. — Protospongia coronata. Dawson. 

 (Figs. 13, 14 and 15. PI. II.. Figs. 5 and 6.) 



Fkj. Vi.—Protospongiri coro- 

 nata. Restored. 



Fig. 14. — Protospongia coronata. Primary, second- 

 ary and protective .spicules, x 5. 



Body ovate, 2 cm. long, but fragments indicate that it grew much 

 larger ; spicules coai-se and four-rayed, so connected as to give the appear- 

 ance l)y their obliquity of a diagonal network of rhombic openings. This 

 nuiy possil)ly be the effect of flattening. Numerous small cruciform flesh 

 spicules. Root spicules strong, short oi- broken off, 2 to 4. Osculum 



4 



Fuj. m.— Protospongia coronata. Showing 

 internal cavity. 



large, terminal, covered with a conical hood made up of curved spicules 

 converging to a point, and 1 cm. in height, in the smaller specimens, in 

 which alone I have seen them, the larger specimens being usiially imper- 

 fect. Short protective spicules visible at the sides. 



