148 BULLETIN OF THE 
with a jagged upper edge, as seen in profile, All the tubes infested with 
parasitic Distoma. The proboscis is large, hanging from a pyramidal eleva- 
tion in the bell cavity left by four recesses, which are prolongations of the 
bell cavity itself, extending into the base of the apical extension of the bell walls. 
The broad tubes which extend along the proboscis hang from this projection 
as in a sling, one from each angle. The prolongations of the bell cavity up- 
ward into the gelatinous substance of the conical apex of the bell leave four 
thick partitions, which separate the upper bell cavity into four chambers. 
These chambers can best be understood by a study of the figures (Plate III. 
figs. 1, 2, 3, 4). The sexual organs were fully developed, and in all the indi- 
viduals which I captured were female. The ovaries in larger specimens were 
swollen with ova, and are formed of vertically placed tubes flanked with 
lateral branches, which, when the ovaries are mature, fill almost the whole 
upper part of the bell cavity below its division into the four chambers already 
mentioned. The stomach is quadrate in shape, with mouth simple, and desti- 
tute of oral tentacles. The proboscis terminates near the veil, and rarely, ex- 
cept in distorted specimens, extends outside the bell opening. 
There are two kinds of tentacles, the smaller of which probably develop into 
the larger. The length of these two kinds of tentacles is very disproportionate. 
The ocelli placed upon their respective bases seem to be arranged in two series, 
those on the bulbs of the longer tentacles are situated higher up on the bell 
than those on the smaller. The long tentacles in the oldest specimen, which 
1 have studied, are very flexible, and when retracted are closely coiled together, 
each one around its respective tentacular bulb. The number of long tentacles 
is sixteen. In the young specimen of O. episcopalis, Forb., which Forbes 
figures, there are but eight long tentacles. Four arise from the point of 
junction of radial and marginal tubes, and three on the bell rim between each 
pair of the primary tentacles. Al sixteen long tentacles have triangular en- 
largements at their bases, and are joined by one angle of the enlargement, to 
while the adjacent angle is continued into a pointed projection, 
1 for a short distance along the side of the bell, as shown in 
At the very tip of this extension there is a bright crimson. 
There are sixteen of these pigment spots, and together they 
They are true ocelli, corresponding with the black eye- 
the bell margin, 
extending upwar 
Plate ITI. fig. 5. 
pigment spot. 
make the upper series. 
spots on the tentacular bulbs of S. mirabilis, Ag. 
Between every pair of these larger tentacles, there are three short, finger- 
like processes, each with a single pigment spot at its base, the color of which is 
the same as that of the pigment spots of the upper series, The centrally placed 
of these three short tentacles is the most developed, and the pigment spot which 
it bears is of about the same size, and has the same appearance, as those of the 
upper series. None of the smaller tentacles send a pointed projection from 
the tentacular bulb up the side of the bell, as is the case with all the long 
tentacles. There are forty-eight smaller tentacles. The pigment spots which 
rior series of these organs. "The tentacles, 
, and with smooth surfaces. Their 
they carry form the second and infe 
both large and small, are hollow, flexible 
