492 CLASS ECHINODERMATA. 
STEPHANOMIA, Peron, 
Appear to be a third combination, in which the lateral 
vesicles, which, in the Physsophore proper, adhere to the 
top of the stem, above the tentacula, are prolonged over its 
length, and mingled with tentacula of various forms. (Ste- 
phanomia amphitritis, Peron.) 
It is at the end of the hydrostatic acalephe, that may be 
placed 
DIPHYES, Cww. 
A very singular genus, in which two different individuals 
are always found together, one being emboxed in a cavity of 
the other, which arrangement, however, permits them to 
separate without destruction to individual life. They are 
gelatinous, transparent, and move pretty nearly like the 
meduse. The one which receives the other, produces from 
its cavity, a chaplet which traverses a semi-canal of its com- 
panion, and appears to be composed of ovaries, of tenta- 
cula, and of suckers, like those of the preceding genera. - 
MM. Quoy and Gaymard, have established divisions in this 
genus, according to the forms and relative proportions of the 
two individuals. 
Thus, in 
DIPHYES, (proper.) 
The two individuals are almost similar, pyramidal, with 
some points round their aperture, which is at the base of the 
pyramid. 
In CALPE, the emboxed individual has still the pyraenas 
form, but the other is very small and square. 
In ABYLE, the emboxed one is oblong, or oval; the other 
a little smaller, and in the form of a bell. 
