384 ACALEPHA. 
Puyssopuora, Forsk. 
These Acalepha are evidently allied to the Physaliz, but their 
bladder is proportionally much smaller, has no crest, and is fre- 
quently accompanied by lateral bladders; their various and numerous 
tentacula are suspended vertically under the bladder, like a garland 
or cluster. In 
Puyssopnora, Pér. 
Or Physsophora properly so called, between the superior bladder 
and the tentacula are other bladders placed-side by side, or one on 
another, sometimes of an irregular figure, and sometimes polyedrous, 
forming, by their union, prisms or cylinders. The tentacula partly 
conical, partly cylindrical, and partly formed by groups of threads 
or globules, and finally, partly filiform and susceptible of considera- 
ble elongation, form a cluster or garland at the inferior extremity(1). 
Hirropus, Quoy and Gaym. 
Where there are merely lateral vesicles, almost semi-circular, or 
shaped like the foot of a horse, and crowded into two ranges, thus 
forming a sort of spike comparable to that of certain grasses, from 
dusa utriculus, Gm., Lamartiniére, Journ. de Phys., Nov. 1787, Il, 13, 14;—Me- 
dusa caravella, Mill., Nat. of Berl., Besch., Il, 9, 2, are Physaliz, but which do 
not appear to be sufficiently described to enable us to unite or distinguish them 
specifically, I will say the same of the Physal. pelagica, Bosc., Vers, Il, xix, 1, 2, 
and the Physalie mégaliste, Pér., Voy. I, xxix, 1. This observation will even apply 
to those of Tilesius, Voy. of Krusentst. and Lesson, Voy. de Duperr. Zooph., pl. 
4 and 5, although better characterized, until we have more accurate observations 
of the changes which age or other circumstances may produce in the number of 
the tentacula. 
(1) Such is the Physsophora hydrostatica, Gm. The individual named Phys. 
musonema, by Pér., Voy. XXIX, 4, is well preserved, that of Forskahl, Ic., XX XIII, 
E, e, 1, e, 2; Encyc., LX XXIX, 7, 9, appears to be the same species, but deprived 
of a portion of its tentacula, which are easily removed. I also think-that the 
Physsophora rosacea, Forsk., XLUI, B, b, 2,and Encyc., LX¥XIX, 10, 11, is a mu- 
tilated specimen of another species. 
Add Rhizophysa Chamissonis, Eisenh., Medus., Ac. Nat. Cur., X, pl. 35, f-.3;— 
Rhiz. helianthus, and Rhiz. melo, Quoy and Gaym., Ann. des Sc. Nat., X, pl. 5, 
and many other undescribed species. 
