About the Cyrenaica we are still insufficiently informed.
Until quite recently the hydroids (Gymnoblastea) and the medusae (Anthomedusae) have been classified separately, since the connexion between them was insufficiently known.
The complexity of modern knowledge and the interrelation of its different branches are often insufficiently realized, and that by writers who differ widely in the application of such material as they use to their particular views of the manifold problems of the Old Testament.
This is the largest group of Mollusca, including nearly sixty families, some of which are insufficiently known from the anatomical point of view.
The significance of two or more (in Drepanophorus very numerous) small sacs containing so-called " reserve " stylets resembling in shape that of the central dart is insufficiently known.