494 
REVIEWS. 
is equivalent to Myriothela , Sars, Mr. Stimpson having shown that 
the C. phrygium of De Blainville (Lucernaria phrygia , Fabricius) is 
an older discovered form of the same genus. Bctopleu/ra, besides the 
Tubularia Dumortieri of Van Beneden, is made to include four species 
of Sarsia, among them the S. pulchella of Forbes. In the table of 
contents it is stated “ that Euphysa belongs to the cycle of Hyboco- 
don ; but it remains to be seen whether the Medusa, here described as 
Hybocodon, is transformed into a genuine Euphysa, or the Euphysa 
produced from the tentacular buds of an Hybocodon.” As already 
hinted, Bougainvillea and Margelis appear to be synonymous with the 
JPerigonymus of Sars. Of the other new genera, KolliJceria includes 
some Medusae allied to Lizzia, but having eight bunches of tentacles ; 
JVemopsis is remarkable as affording the only known example of a free 
Hydroid ; Stomotoca is equivalent to Saphenia, Forbes. Trichydra , 
Wright, is transferred to the Sertularice, together with the Atractylis 
repens of the same observer. The medusoid of Trichydra is still 
unknown. 
The Sertularice with fixed reproductive zooids correspond to the 
eight and ninth families in the above list, and the Campanularians, with 
their associated medusoids, to the three families immediately pre¬ 
ceding them. The remaining families chiefly include Medusae ; little, 
if anything, being accurately known of the Hydroids from which 
some, at least, of them originate. iSertularia, as restricted by John¬ 
ston, is here divided into no less than six genera ; S. pumila being re¬ 
ferred to Dynamena , S. operculata to Amphisbetia , S. polyzonias to 
Cotulina, S. rugosa and S. picia to Amphitrocha; while Sertularia 
itself contains only the excurrent form S. cupressina, with its near 
allies, and perhaps also Blumularia falcata , the remaining species 
being placed in JDiphasia. The older name Nemertesia is rightly sub¬ 
stituted for the Antennularia of Lamarck, and Campanularia tincta 
is elevated to the rank of a distinct genus, Hinksia, so named in 
honour of its discoverer. In like manner, Campanularia syringa and its 
allies, (among which, however, we cannot follow our author in bring¬ 
ing the Laomedea acuminata of Alder), form the new genus Wrightia. 
Bolyorchis, Gonionemus and Bhegmatodes are genera of Naked-eyed 
Medusae established by Alexander Agassiz for newly-discovered 
forms. So is, likewise, his Crematostoma , which includes, also the 
Mesonema pilens of Lesson. Leuckartia has been established for 
Geryonia probosidalis, Leuck. ; Hypsonema, for Cytceis po'ystyla, 
Will.; and Gossea for Thaumantias corynetes of Glosse. 
Turning now to the Siphonophora, we are sorry to find that Pro¬ 
fessor Agassiz rejects the very natural group Calycophoridee of 
Leuckart, and refuses to admit the unity of organisation which pre¬ 
vails among the float-bearing Hydrostatic Acalephs. The division of 
these last into three sub-orders must be looked upon as a retrograde 
step. To the sub-order Bhysophorce the Hippopodidce, which bear no 
float, are referred; the only reason given for separating this family 
from its natural allies being that, “ the communities of the Hippopo- 
