MUSEUM OF COMPARATIVE ZOÓLOGY. 147 
tips covered with knobs not unlike those in Lizzia, The mouth is never pro- 
truded beyond the bell opening. There were three half-formed buds on the 
walls of the upper part of the proboscis, but none were far enough developed to 
exhibit movements of themselves, and appeared to be enclosed in a capsule. 
Tentacles hollow, flexible, transparent, sometimes carried upright as in Fig. 3, 
are about equal length, and with smooth surfaces, Number of tentacles eight. 
The tentacular bulbs are divided into two parts, an external portion so called, 
since more distant from the centre of the disk than the other, is carried external 
to the bell cavity as the jelly-fish swims, and is of dark brown color. A smaller, 
internal part of crimson color may be likened to a true ocellus. Sexual organs 
not known. Hydroid unknown. This genus is the only one described in which 
budding takes place from the proboscis of a hydroid medusa with eight, or more 
than four, chymiferous tubes. It resembles closely Dysmorphosa fulgurans, 
A. Ag. 
I feel sure from repeated examination that Mabella has eight tubes in the 
bell, but cannot definitely say that it is not the same as D. fulgurans, A. Ag. 
Brandt * represents in Rathkea Blumenbachii a jelly-fish with eight tubes, but 
the tentacles in it are not single, and no reference is made by him to gemma- 
tion from its proboscis as a method of reproduction. The shape of the bells of 
Rathkea Blumenbachii and M. gracilis is very different, which leads me to think 
that these two medusæ, although alike in the number of chyniferous tubes 
radially arranged in the bell, are not the same. 
Turris episcopalis, Frwxes. 
Oceania episcopalis, FORBES. 
Plate III. Figs. 1, 2, 3, 4, 5, 6. 
Several specimens of a jelly-fish, which seems to be identical with the 0. 
episcopalis of Forbes, were taken by me last summer. These mednsæ were all 
found in the same week in July, and at no other time. In former seasons it 
has not been seen, The whole number of specimens taken was ten. This me- 
dusa is one of the largest of the Tubularians of our waters, and is inferior to 
none in beauty. The positions which it assumes while swimming are very 
characteristic and full of grace. The bell is shaped like an inverted teacup, 
with a conical prolongation above. "This projection may be retracted into a 
spherical shape, or greatly elongated into a slender cone. In some specimens 
the cone is capped on the apex by a small button. The prolongation is gelati- 
nous and solid, with smooth surface. The walls of the bell itself are thin, 
transparent, pale milky white. The radial tubes are very broad with lateral 
glands (?) or muscular attachments to the bell walls, imparting to their out- 
line a jagged appearance. Number of radial tubes four, Circular tube broad, 
* Brandt, Beschreibung der Oceania Blumenbachii einer bei Sevastopol gefundenen 
leuchtenden Medusa von H. Rathke, 4 Oct., 1833. 
