AGASSIZ. NATURAL HISTORY OF THE UNITED STATES. 491 
Family 5.—ANTHOPHYSiDiB. 
Athorybia, Esch. 
Family 6 .—Bhizophysid^e. 
Bhizophysa, Per fy LeS. 
Sub-order YIII. - DIPHX2E. 
Family 1.—-Prayidae. 
Praia, Q. fy G. Sphseronectes, Huxl. 
Family 2 .-—Dipbyidjb. 
Diphyes, Cuv. Huxleyia, Ag. 
Muggisea, Busch. Graleolaria, DeBl. 
Family 3.—Abylid^;. 
Abyla, Q. fy G. Bassia, Q. fy G. ; 
Calpe, Q. fy G. 
Throughout the whole of this Tabular View, Professor Agassiz 
deals very freely with the groups of his predecessors, sub-dividing, 
suppressing and redistributing them, at the same time establishing 
several of his own, and, in consequence, laying himself open to much 
criticism. Thus the placing of Eudendrium in a family by itself, 
apart from the Bougainvillidee, with the curt definition of “No free 
Medusae,” is surely not justifiable. Nor can we, in fairness, sanction 
the adoption of a number of other and more important changes, in 
favour of which no reasons whatever are given ; such, for example, 
as his re-construction of the genus Diphges, and the admission of 
many of the obscure species and genera founded by the French 
navigators. Our author, in fact, seems to struggle with difficulty under 
the vast mass of materials which his industry has collected, and, if 
internal evidence may be trusted, is far from being familiar with the 
contents of many of the memoirs which he cites. Like the magician 
of old, perplexed with the crowd of phantoms which his wand had 
summoned but was not able to disperse, so do we find him often en¬ 
cumbered with the ghosts of the bad species established by Lesson, 
Peron and LeSeueur, and others. The valuable researches of 
Allman on the reproduction of the fixed Hydroids, which anticipate 
so much of what Professor Agassiz has himself achieved in the same 
field, are passed by with little notice. Yet if in some instances he is 
thus neglectful, he has also thrown a great deal of light on the 
embarrassed synonomy of the extensive hydroid group, and has 
tended not a little to further the advance of those who choose to 
follow in the same path of inquiry. 
In the notes to the same Tabular Yiew the following new forms 
of Naked-eyed Medusae are described by the author and his son, 
Alexander Agassiz. 
