178 Dr. C. Claus on the Ephyree of 
cate that the older Scyphostomes, as well as the Strobila-stages, 
contain these vegetable cells in abundance, and grow large in 
definite localities which are particularly favourable to the 
access of those organisms. Perhaps in this we may also find 
the reason why no one has hitherto succeeded in bringing the 
bred Scyphostomes to strobilation. 
The youngest Ephyra of the Mediterranean and Adriatic 
Cotylorhiza 1s a comparatively large form of about 14 to 
2 millim. diameter, with eight long slender lobes, the cleft 
pieces or ocular lobes of which appear rounded off rather than 
pointed. In form and internal structure it possesses all the 
peculiarities of the known Ephyree of the Semaostomean Me- 
duse with the exception of the Ephyropside, the Kphyree of 
which, as I have recently proved, exhibit important deviations 
both in the constitution of the gastral space and in the form 
of the umbrella (see Claus, d.c. Taf. vii. fig. 48). In 
its appearance our form stands between the well-described 
Ephyre of Aurelia and Chrysaora, but is distinguished from 
both by several peculiarities which are wanting in them, and 
which enable it to be at once recognized and determined. 
The most striking of these are the numerous yellowish-brown 
algal cells, which partly float freely in the gastral space and 
partly in the radial canals, already taken up by the entoderm, 
giving rise to the peculiar coloration, and by their accumulation, 
especially at the lateral confines of the radial canals, producing 
two streaks in each of the main lobes. Among hundreds of 
Ephyre I have not met with a specimen in which this charac- 
ter did not strikingly occur, and I therefore believe that these 
vegetable intruders perform a great, perhaps a necessary, part 
in the life of the Cotylorhiza. 1 will hereafter revert 
more particularly to these vegetable cells. Another less 
striking character, only observable by careful examination, 
consists in the presence of numerous spindle-shaped crystals 
in the terminal division of the ocular lobes. ‘These crystals 
remind one of the chrome-yellow crystals in the ectoderm of 
Nausithoé; but they are colourless and do not border the whole 
margin of the lobe, but lie collected together at the surface of 
the lobe. ‘They likewise originate singly in ectodermal cells. 
In the vascular apparatus the size of the radial intermediate 
vessels is remarkable, which, indeed, are entirely covered by 
the radial muscle, but the limits of which are still easily recog- 
nized on account of the colour of the contents. In the Ephyra 
of Aurelia these vessels scarcely appear as diverticula; while 
in that of Chrysaora they show the same considerable deve- 
lopment. Nevertheless the latter larva cannot be confounded 
with ours, for it is at ouce recognizable by the external and 
