106 



ROYAL SOCIETY OF CANADA 



18 no f^round for this except a i-eseiiililance in Lfoneral form. The strut- 

 tums, 80 far as known, are quite ditt'crent. 



Note. — The two followini; species, haviutf tlie row.s of spiciiles diagon- 

 ally arrauired. as I remarked in de.seriltinjf them in 188'J. have l)een 

 placed hy Eautf in a new i^enus Diagonivlld. I douht the expediency of 

 this on the mere ground of divergence of the rows of rae.shes from 

 horizontality. But tlieiv are other peculiarities of these sjiecies. which 

 miglit fairly entitle them to constitute distinct sections of the i;-enus, 1 

 therefore, i»lace them hy themselves, noting these ditferences : 



5. — Protosi'Oncua CORONATA. Uaw.son. 

 (Figs. 13, U and 15. PI. 11., Figs. 5 and G.) 



Fi(i. \'A. — Pfotonpongm coro- 

 nafa. Restored. 



Fi(i. H.—Protospongia coronata. Primary, second- 

 ary and protective spicules, x 5. 



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

 larger ; sjiicules coarae and four-rayed, so connected as to give tlie appear- 

 ance I)}' their t)hli(|uity of a diagonal netwoi-li of rhomliic openings. This 

 may possihly he the effect of flattening. Numerous small cruciform flesh 

 spicules, Eoot spicules strong, short or hroken off. 2 to 4. Osculum 



Fig. 15. 



-Protoaporiffia coronata. 

 internal cavity. 



Showing 



large, terminal, covered witli a conical hood made u]i of curved s]iicules 

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

 which alone I have seen tliem, the larger sjieeimens heing usually imper- 

 fect. Short protective spicules visihle at the sides. 



5 = 



