[BIGELOW] A NEW GENUS OF ANTHOMEDUSÆ 93 
margin, according to the ages of the tentacles. No matter how much 
elevated the tentacle bases are above the margin, they are, of course, 
permanently connected with the latter, and with the circular canal 
as is, indeed, the universal rule. And in this case this connection 
comprises a strand of thickened ectoderm leading from tentacle bulb 
to margin, in addition to the entodermal roots, instead of being re- 
duced to the latter alone as in the Bythotiaridæ (e.g. Calycopsis and 
Heterotiara, 1909, 1913). Each basal bulb, old or young, bears a 
prominent ocellus, consisting of yellowish red pigment ring, with en- 
closed clear area, on its outer, abaxial side (figs. 4 and 5): since the abax- 
ial location of these is important, as pointed out below, it is fortunate 
that it is as easily established on the photographs as on the actual 
specimens. 
In the type specimen there are 10-11 tentacles in each quadrant, 
i.e.;a total, with the four radials, of about fifty: in the other large speci- 
men there are forty-six in all; in the smallest example, forty-five. 
The arrangement of the tentacles is so unusual as to demand special 
notice. In all the quadrants of all three specimens the inter- and sub- 
radial tentacles are closely grouped together, and separated from the 
radial tentacle on either hand, by a considerable gap (fig 3). In the 
smallest specimen, which, of the three, shows the arrangement of 
the tentacles most clearly, the numbers per quadrant (exclusive of 
radials) are 10, 10, 10, 11. The radial tentacles are largest, and lo- 
cated highest up on the exumbrella: next in size, and in distance from 
the margin, are the inter-radials (fig. 9). In the one quadrant in 
which the tentacles (11 in number) are symmetrical, the latter is flanked 
on either hand by a very small tentacle located close to the bell- 
margin (fig. 9). Next to this, again, in either half of the quadrant, 
is a tentacle only slightly smaller than the interradial, and nearly 
as far from the margin: and this is flanked, in its turn, by a series of 
three tentacles, successively smaller and smaller (younger and younger) 
as the per-radius is approached. 
The tentacles are arranged on fundamentally this same plan on 
all the quadrants of all three specimens. But in the large specimens 
the interradials are as large, and located as high up on the exumbrella, 
as the radials, and the subradials, flanking the interradials, are ir- 
regular in number and location, according as more or less have been 
interpolated. However, it is clear that the fundamental plan of 
succession, in all cases, is first, radial tentacle, then interradial, followed, 
on either side of the latter by a successive series progressing toward the 
perradius. But interpolation of other tentacles then takes place on 
either side of the interradials, and irregularly between the other 
Sec. IV, Sig. 4 
