MUSEUM OF COMPAKATIVE ZOOLOGY. 147 



tips covered with knobs not unlike those in Lizzia. The mouth is never pro- 

 truded beyond the bell opening. There were three hali-iornied 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 Drjsmorphosa fulgurans, 

 A. Ag. 



I feel sure from repeated examination that Mahella has eight tubes in the 

 bell, but camiot definitely say that it is not the same as D. fulgurans, A. Ag. 

 Brandt * represents in Rathkea Blumenhachii a jelly-fish Avith 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 

 Eathkea Blumenhachii and M. gracilis is very different, which leads me to think 

 that these two medusae, although alike in the number of chyniferous tubes 

 radially arranged in the bell, are not the same. 



Turris episcopalis, Fewkes. 

 Oceania episcopalis, Forbes. 



Plate III. Figs. I, 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 medusge 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 

 leuchtendeu Medusa von 11. Rathke, 4 Oct., 1833. 



