with some Remarks on the Nature of the Spongiæ Marine. 407 
them the opportunity, would, from their own researches on these productions, 
furnish us with more full and accurate details, and thereby lay the foundation 
for a separate and copious work,—indeed a complete monograph,—on the 
Sponges ; recollecting also the concluding remark of the late Professor Pallas, 
which is at this day even far from being inapplicable: “ Quibus Spongiarum 
fertiles oceani tractus lustrare contigerit bene multa invenient qua superad- 
dant et magnum in scientia naturali explebit hiatum, qui plenam Spongiarum 
historiam dabit, gnaris gratissimam certe futuram atque utilissimis observa- 
tionibus feracissimam *." 
* Elench. Zooph., p. 377. 
VOL. XVIII. 3H 
